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Tanzer T, Pham B, Warren N, Barras M, Kisely S, Siskind D. Overcoming clozapine's adverse events: a narrative review of systematic reviews and meta-analyses. Expert Opin Drug Saf 2024:1-21. [PMID: 38814794 DOI: 10.1080/14740338.2024.2362796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Accepted: 05/29/2024] [Indexed: 06/01/2024]
Abstract
INTRODUCTION Clozapine is the gold standard treatment for treatment-resistant schizophrenia, however adverse events remain a clinical challenge. AREAS COVERED This review presents a narrative synthesis of systematic reviews and meta-analyses that have reported the onset, incidence, prevalence, and management of clozapine's adverse events. We conducted a systematic literature search using PubMed, Embase, PsycINFO, OvidMEDLINE, CINAHL, and the Cochrane Database of Systematic Reviews from inception to April 2024. EXPERT OPINION Effective management of clozapine's adverse events necessitates multi-faceted, individualized, and shared-decision strategies. Despite a lack of high-quality systematic evidence, expert inter-disciplinary solutions are provided to help address a critical need for clinical guidance. This 35-year update offers an evidence-based framework to assist clinicians, patients, and caregivers navigate the adverse events associated with clozapine therapy.
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Affiliation(s)
- Timothy Tanzer
- Princess Alexandra Hospital, Department of Pharmacy, Brisbane, Australia
- Medicine, University of Queensland, Brisbane, Australia
- School of Pharmacy, University of Queensland, Brisbane, Australia
| | - Betty Pham
- Department of Pharmacy, Metro South Community and Oral Health, Brisbane, Australia
| | - Nicola Warren
- Medicine, University of Queensland, Brisbane, Australia
- Metro South Addiction and Mental Health Service, Brisbane, Australia
| | - Michael Barras
- Princess Alexandra Hospital, Department of Pharmacy, Brisbane, Australia
- School of Pharmacy, University of Queensland, Brisbane, Australia
| | - Steve Kisely
- Medicine, University of Queensland, Brisbane, Australia
- Metro South Addiction and Mental Health Service, Brisbane, Australia
| | - Dan Siskind
- Medicine, University of Queensland, Brisbane, Australia
- Metro South Addiction and Mental Health Service, Brisbane, Australia
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De Las Cuevas C, Sanz EJ, Gross JA, Correll CU, Verdoux H, Lally J, de Filippis R, Schulte PFJ, Molden E, Arrojo-Romero M, Bostrom AD, Schoretsanitis G, Fernandez-Egea E, de Leon J. Revealing the reporting disparity: VigiBase highlights underreporting of clozapine in other Western European countries compared to the UK. Schizophr Res 2024; 268:175-188. [PMID: 38065799 DOI: 10.1016/j.schres.2023.11.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 11/17/2023] [Accepted: 11/22/2023] [Indexed: 06/15/2024]
Abstract
BACKGROUND Pharmacovigilance studies indicate clozapine history is marked by adverse drug reactions (ADRs). OBJECTIVE In a 2021 article, the United Kingdom (UK) had >90 % of European clozapine-related fatal outcomes in VigiBase, the World Health Organization's pharmacovigilance database. Two possibly opposing hypotheses could explain this disparity: 1) fewer reported fatal outcomes in other Western European countries mainly reflect underreporting to VigiBase, and 2) the higher number of UK reports reflects higher real relative mortality. METHODS VigiBase reports from clozapine's introduction to December 31, 2022, were studied for ADRs and the top 10 causes of fatal outcomes. The UK was compared with 11 other top reporting Western countries (Germany, Denmark, France, Finland, Ireland, Italy, Netherlands, Norway, Spain, Sweden and Switzerland). Nine countries (except Ireland and Switzerland) were compared after controlling for population and clozapine prescriptions. RESULTS The UK accounted for 29 % of worldwide clozapine-related fatal outcomes, Germany 2 % and <1 % in each of the other countries. The nonspecific label "death" was the top cause in the world (46 %) and in the UK (33 %). "Pneumonia" was second in the world (8 %), the UK (12 %), Ireland (8 %) and Finland (14 %). Assuming that our corrections for population and clozapine use are correct, other countries underreported only 1-10 % of the UK clozapine fatal outcome number. CONCLUSIONS Different Western European countries consistently underreport to VigiBase compared to the UK, but have different reporting/publishing styles for clozapine-related ADRs/fatal outcomes. Three Scandinavian registries suggest lives are saved as clozapine use increases, but this cannot be studied in pharmacovigilance databases.
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Affiliation(s)
- Carlos De Las Cuevas
- Department of Internal Medicine, Dermatology and Psychiatry, School of Medicine, University of La Laguna, Canary Islands, Spain; Instituto Universitario de Neurociencia (IUNE), Universidad de La Laguna, San Cristóbal de La Laguna, Spain.
| | - Emilio J Sanz
- Department of Physical Medicine and Pharmacology, School of Medicine, Universidad de La Laguna, Canary Islands, Spain; Hospital Universitario de Canarias, Tenerife, Spain
| | | | - Christoph U Correll
- Department of Child and Adolescent Psychiatry, Charité Universitätsmedizin, Berlin, Germany; The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Glen Oaks, NY, USA; Department of Psychiatry, Zucker School of Medicine at Northwell/Hofstra, Hempstead, NY, USA.
| | - Hélène Verdoux
- Université Bordeaux, Inserm, Bordeaux Population Health Research Center, Team Pharmacoepidemiology, Bordeaux, France.
| | - John Lally
- Department of Psychiatry, School of Medicine and Medical Science, University College Dublin, Dublin, Ireland.; Department of Psychiatry, St Vincent's Hospital Fairview, Dublin, Ireland; Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience (IoPPN), King's College London, London, UK.
| | - Renato de Filippis
- Psychiatry Unit, Department of Health Sciences, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - Peter F J Schulte
- Mental Health Services Noord-Holland-Noord, Alkmaar, the Netherlands; Dutch Clozapine Collaboration Group, Castricum, the Netherlands.
| | - Espen Molden
- Center for Psychopharmacology, Diakonhjemmet Hospital, Oslo, Norway; Department of Pharmacy, University of Oslo, Oslo, Norway.
| | - Manuel Arrojo-Romero
- Department of Psychiatry, Complejo Hospitalario Universitario de Santiago, Santiago de Compostela, Spain.
| | - Adrian D Bostrom
- Centre for Psychiatry Research, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden; Department of Clinical Sciences/Psychiatry, Umeå University, Umeå, Sweden.
| | - Georgios Schoretsanitis
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Glen Oaks, NY, USA; Department of Psychiatry, Zucker School of Medicine at Northwell/Hofstra, Hempstead, NY, USA; Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zürich, Zürich, Switzerland
| | - Emilio Fernandez-Egea
- Department of Psychiatry, University of Cambridge, Cambridge, UK,; Cambridgeshire and Peterborough NHS Foundation Trust, Fulbourn Hospital, Fulbourn, Cambridge, UK.
| | - Jose de Leon
- Mental Health Research Center at Eastern State Hospital, Lexington, KY, USA; Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apostol Hospital, University of the Basque Country, Vitoria, Spain.
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Fanshawe JB, Lennox BR. Does the evidence now suggest we can safely reduce the frequency of haematological monitoring for patients stabilised on clozapine? Lancet Psychiatry 2024; 11:400-402. [PMID: 38697179 DOI: 10.1016/s2215-0366(24)00140-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2024] [Accepted: 04/23/2024] [Indexed: 05/04/2024]
Affiliation(s)
- Jack B Fanshawe
- Department of Psychiatry, University of Oxford, Oxford OX3 7JX, UK
| | - Belinda R Lennox
- Department of Psychiatry, University of Oxford, Oxford OX3 7JX, UK.
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Sathienluckana T, Jansing T, Srisuriyakamon S, Thonkhunthod A, Sangsuwanto P, Losatiankij P, Supanya S. Comparison of the Effectiveness and Safety of Clozapine Between Once-Daily and Divided Dosing Regimen in Patients With Treatment-Resistant Schizophrenia. Ann Pharmacother 2024; 58:598-604. [PMID: 37743679 DOI: 10.1177/10600280231201708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/26/2023] Open
Abstract
BACKGROUND Clozapine is the most effective antipsychotic with respect to the incidence of discontinuation and is indicated for treatment-resistant schizophrenia. Although the recommendation for clozapine administration is divided dosing, once-daily dosing of clozapine is commonly prescribed in many countries. However, there is currently no clinical data comparing all-cause discontinuation between the 2 methods of administration of clozapine. OBJECTIVES To compare the all-cause discontinuation and safety of clozapine administration between once-daily and divided dosing regimens. METHODS This was a retrospective cohort study. Participants were patients with treatment-resistant schizophrenia who had received 300 to 600 mg/day of clozapine for at least 3 months. Data were collected from outpatient medical records at Somdet Chaopraya Institute of Psychiatry. Eligible patients were classified into 2 groups: once-daily dosing and divided dosing. The primary outcome was the all-cause discontinuation rate between groups. The duration of the study was 2 years. RESULTS One hundred eighteen patients were included and analyzed in this study (once-daily dosing group: n = 58; divided dosing group: n = 60). There was no significant difference in all-cause discontinuation between the 2 groups (odds ratio 1.03; 95% confidence interval: [0.28, 3.79]: P = 1.00), or adverse events between groups. CONCLUSION AND RELEVANCE In patients with treatment-resistant schizophrenia, there were no significant differences in effectiveness or safety between once-daily and divided dosing of clozapine. Further prospective studies with larger sample sizes are required to confirm these findings.
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Affiliation(s)
| | | | | | | | | | | | - Suttha Supanya
- Somdet Chaopraya Institute of Psychiatry, Bangkok, Thailand
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Kang N, Kim SH, Kim J, Kim S, Jang J, Yoon H, Lee J, Kim M, Kim YS, Kwon JS. Association between initial clozapine titration and pneumonia risk among patients with schizophrenia in a Korean tertiary hospital. Schizophr Res 2024; 268:107-113. [PMID: 37770376 DOI: 10.1016/j.schres.2023.09.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 09/14/2023] [Accepted: 09/15/2023] [Indexed: 09/30/2023]
Abstract
Pneumonia is a significant adverse drug reaction (ADR) associated with clozapine, characterized by high mortality and potential linkage with other inflammatory responses. Despite the critical nature, research regarding the development of pneumonia during initial clozapine titration remains limited. This retrospective study included 1408 Korean inpatients with schizophrenia spectrum disorders. Data were collected from January 2000 to January 2023. Pneumonia developed in 3.5 % of patients within 8 weeks of clozapine initiation. Patients who developed pneumonia were taking a greater number and higher dose of antipsychotics at baseline (2.14 vs. 1.58, p < 0.001; 25.64 vs. 19.34, p = 0.012). The average onset occurred 17.24 days after initiation, on an average dose of 151.28 mg/day. Titration was either paused or slowed in most of these patients, with no reported fatalities. The types of pneumonia included aspiration pneumonia, mycoplasma pneumonia, bronchopneumonia, and COVID-19 pneumonia. Myocarditis, drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome, and urinary tract infections were also identified. Logistic regression analysis revealed that a greater number of concomitant antipsychotics (odds ratio [OR] = 1.59, p = 0.027) and concomitant benzodiazepine use (OR = 2.33, p = 0.005) at baseline were associated with an increased risk of pneumonia. Overall, pneumonia development during clozapine titration is linked with other inflammatory ADRs, suggesting a shared immunological mechanism. Close monitoring is recommended, especially for patients taking multiple antipsychotics and benzodiazepines. Further studies involving repeated measures of clozapine concentrations at trough and steady state, along with a more detailed description of pneumonia types, are warranted.
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Affiliation(s)
- Nuree Kang
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea
| | - Se Hyun Kim
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea; Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea.
| | - Jayoun Kim
- Medical Research Collaborating Center, Seoul National University Hospital, Seoul, Republic of Korea
| | - Sungkyu Kim
- Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
| | - Jinhyeok Jang
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea
| | - Heesoo Yoon
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea
| | - Jeonghoon Lee
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea
| | - Minah Kim
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea; Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Yong Sik Kim
- Department of Psychiatry, Nowon Eulji Medical Center, Eulji University, Seoul, Republic of Korea
| | - Jun Soo Kwon
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea; Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea; Department of Brain and Cognitive Sciences, Seoul National University College of Natural Sciences, Seoul, Republic of Korea; Institute of Human Behavioral Medicine, SNU-MRC, Seoul, Republic of Korea
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Kang N, Kim SH, Kim J, Kim S, Jang J, Yoon H, Lee J, Kim M, Kim YS, Kwon JS. Association between initial pattern of clozapine titration, concentration-to-dose ratio, and incidence of fever in patients with schizophrenia spectrum disorders in a Korean tertiary hospital. Schizophr Res 2024; 268:131-137. [PMID: 37633775 DOI: 10.1016/j.schres.2023.08.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 08/01/2023] [Accepted: 08/04/2023] [Indexed: 08/28/2023]
Abstract
Safe and effective administration of clozapine requires careful monitoring for inflammatory reactions during the initial titration. The concentration-to-dose (C/D) ratio must be taken into account, which may vary among ethnicities. In this retrospective study, 1408 Korean schizophrenia inpatients were examined for during the first 8 weeks of clozapine titration. The average doses of clozapine administered during weeks 1, 2, 4, and 8 were 77.37, 137.73, 193.20, and 212.83 mg/day, with significantly lower doses for females than males. The average C/D ratio was significantly higher in females (1.75 ± 1.04 and 1.11 ± 0.67 ng/mL per mg/day). Patients with higher C/D ratios were more likely to experience fever and were prescribed lower doses of clozapine starting from week 4. In total, 22.1 % of patients developed a fever at an average of 15.74 days after initiating clozapine. Patients who developed a fever were younger, used more antipsychotics at baseline, had a higher C/D ratio, and had a higher incidence of an elevated C-reactive protein level. A higher C/D ratio, use of a greater number of antipsychotics at baseline, and concomitant olanzapine use were risk factors for the development of inflammatory reactions. The incidence of pneumonia, agranulocytosis, and myocarditis within 8 weeks were 3.7 %, 0.3 %, and 0.1 %. In summary, the target dose of clozapine titration is lower for Korean schizophrenia patients, with a higher C/D ratio and more frequent fever compared to Western patients; however, myocarditis occurs rarely. Our findings may contribute to the titration methods for clozapine for the East Asian population.
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Affiliation(s)
- Nuree Kang
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea
| | - Se Hyun Kim
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea; Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea.
| | - Jayoun Kim
- Medical Research Collaborating Center, Seoul National University Hospital, Seoul, Republic of Korea.
| | - Sungkyu Kim
- Biomedical research institute, Seoul National University Hospital, Seoul, Republic of Korea
| | - Jinhyeok Jang
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea
| | - Heesoo Yoon
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea
| | - Junhee Lee
- Department of Psychiatry, Uijeongbu Eulji Medical Center, Uijeongbu, Republic of Korea
| | - Minah Kim
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea; Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Yong Sik Kim
- Department of Psychiatry, Nowon Eulji Medical Center, Eulji University, Seoul, Republic of Korea
| | - Jun Soo Kwon
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea; Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea; Department of Brain and Cognitive Sciences, Seoul National University College of Natural Sciences, Seoul, Republic of Korea; Institute of Human Behavioral Medicine, SNU-MRC, Seoul, Republic of Korea
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Grover S, Naskar C. Patient and caregivers perspective about clozapine: A systematic review. Schizophr Res 2024; 268:223-232. [PMID: 37385885 DOI: 10.1016/j.schres.2023.06.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2023] [Revised: 06/10/2023] [Accepted: 06/12/2023] [Indexed: 07/01/2023]
Abstract
BACKGROUND Clozapine is a gold standard treatment for treatment-resistant schizophrenia. However, the patients' and caregivers' perception and their experience with clozapine has remained much less explored. AIM To review the available literature on the patients' and caregivers' attitudes, perceptions, and experiences with clozapine. METHODOLOGY 27 original research and review articles published in PubMed-indexed journals till March 2023 in the English language, exploring the patient and/or caregiver/family member's experience with using clozapine, were included. RESULTS 30-80 %of patients and 92-100 % of caregivers were found to have a positive attitude towards clozapine in terms of its impact on psychopathology, cognitive and social functioning of the patient, and caregiving needs. Most patients and caregivers also found that the positive effects of clozapine outweighed the side effects and distress related to repeated blood testing. However, a lack of satisfaction was noted among both patients and caregivers regarding the knowledge provided to them regarding clozapine, especially regarding its common adverse effects. Discontinuation of clozapine was found to be more commonly done by the patients' accord rather than clinicians, and the perceived side effects like hypersalivation and excessive sedation emerge as important factors that lead to discontinuation rather than the need for repeated blood testing. CONCLUSIONS Overall, patients and their caregivers share a positive attitude towards clozapine and perceive it to be an effective and beneficial drug, but more effort needs to be directed by the clinical teams to educate the users of clozapine regarding its complete side effect profile and provide continuous guidance about dealing with the emerging side effects throughout treatment.
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Affiliation(s)
- Sandeep Grover
- Post Graduate Institute of Medical Education & Research, Chandigarh, India.
| | - Chandrima Naskar
- Post Graduate Institute of Medical Education & Research, Chandigarh, India
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Puolakka H, Solismaa A, Lyytikäinen LP, Viikki M, Seppälä N, Mononen N, Lehtimäki T, Kampman O. Polymorphisms in ERBB4 and TACR1 associated with dry mouth in clozapine-treated patients. Acta Neuropsychiatr 2024:1-6. [PMID: 38634369 DOI: 10.1017/neu.2024.9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 04/19/2024]
Abstract
BACKGROUND Sialorrhea is a common and uncomfortable adverse effect of clozapine, and its severity varies between patients. The aim of the study was to select broadly genes related to the regulation of salivation and study associations between sialorrhea and dry mouth and polymorphisms in the selected genes. METHODS The study population consists of 237 clozapine-treated patients, of which 172 were genotyped. Associations between sialorrhea and dry mouth with age, sex, BMI, smoking, clozapine dose, clozapine and norclozapine serum levels, and other comedication were studied. Genetic associations were analyzed with linear and logistic regression models explaining sialorrhea and dry mouth with each SNP added separately to the model as coefficients. RESULTS Clozapine dose, clozapine or norclozapine concentration and their ratio were not associated with sialorrhea or dryness of mouth. Valproate use (p = 0.013) and use of other antipsychotics (p = 0.015) combined with clozapine were associated with excessive salivation. No associations were found between studied polymorphisms and sialorrhea. In analyses explaining dry mouth with logistic regression with age and sex as coefficients, two proxy-SNPs were associated with dry mouth: epidermal growth factor receptor 4 (ERBB4) rs3942465 (adjusted p = 0.025) and tachykinin receptor 1 (TACR1) rs58933792 (adjusted p = 0.029). CONCLUSION Use of valproate or antipsychotic polypharmacy may increase the risk of sialorrhea. Genetic variations in ERBB4 and TACR1 might contribute to experienced dryness of mouth among patients treated with clozapine.
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Affiliation(s)
- Hanna Puolakka
- Department of Psychiatry, Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
| | - Anssi Solismaa
- Department of Psychiatry, Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- Department of Psychiatry, The Pirkanmaa Wellbeing Services County, Tampere, Finland
| | - Leo-Pekka Lyytikäinen
- Department of Clinical Chemistry, Fimlab Laboratories and Finnish Cardiovascular Research Center-Tampere, Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
| | - Merja Viikki
- Department of Psychiatry, Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- Department of Psychiatry, The Wellbeing Services County of Ostrobothnia, Seinäjoki, Finland
| | - Niko Seppälä
- Department of Psychiatry, Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- Department of Psychiatry, Satasairaala Hospital, The Satakunta Wellbeing Services County, Pori, Finland
| | - Nina Mononen
- Department of Clinical Chemistry, Fimlab Laboratories and Finnish Cardiovascular Research Center-Tampere, Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
| | - Terho Lehtimäki
- Department of Clinical Chemistry, Fimlab Laboratories and Finnish Cardiovascular Research Center-Tampere, Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
| | - Olli Kampman
- Department of Psychiatry, Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- Department of Psychiatry, The Pirkanmaa Wellbeing Services County, Tampere, Finland
- Department of Psychiatry, Department of Clinical Sciences (Psychiatry), Faculty of Medicine, University Hospital of Umeå, Umeå University, Umeå, Sweden
- Department of Clinical Medicine (Psychiatry), Faculty of Medicine, University of Turku, Turku, Finland
- Department of Psychiatry, The Wellbeing Services County of Ostrobothnia, Vaasa, Finland
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Tirupati S, Arachchi MK. High rates of myocarditis with clozapine in the Hunter region of Australia. Schizophr Res 2024; 264:543-548. [PMID: 38330687 DOI: 10.1016/j.schres.2024.01.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 01/09/2024] [Accepted: 01/22/2024] [Indexed: 02/10/2024]
Abstract
OBJECTIVE To study the causes of clozapine treatment discontinuation and measure clozapine-induced myocarditis (CIM) rates in an Australian region, to compare the observed rates of CMI with reports from Australia and the world, and discuss factors related to CIM incidence rates in the region. METHODS The study is a retrospective clinical audit of 327 patients prescribed clozapine. All patients were monitored by the mandatory CIM monitoring protocol for the first six weeks of treatment. The validity of a diagnosis of CIM was assessed using six criteria. Socio-demographic and clinical factors and clozapine prescription practices were analysed for their association with CIM. The study could not examine co-existing medical illness, co-prescribed psychotropic medication, genetics, and environmental factors. RESULTS CIM occurred in 9.8 % of the cohort after a mean treatment duration of 19.5 days. The diagnosis of CIM was considered valid in all cases. Gender, age at the start of treatment, ethnicity, cumulative clozapine dose, dose titration, and clozapine/norclozapine ratio were unrelated to CIM. CONCLUSION The CIM rate in the Hunter region was higher than in the rest of Australia and the world and increased after adopting the monitoring protocol. Over-diagnosis, patient's age and gender, ethnicity, cumulative clozapine dose, dosing titration, and clozapine metabolism rate were unrelated to the high occurrence rates. The possible role of comorbid illnesses, co-prescribed psychiatric medications, genetic, and environmental factors in the etiology of CIM requires further study. The reasons underlying the high rates of CIM in the Hunter region need further exploration.
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Affiliation(s)
- Srinivasan Tirupati
- Psychiatric Rehabilitation Service, Hunter New England Mental Health, Morisset, NSW 2264, Australia; School of Medicine and Public Health, Faculty of Health, The University of Newcastle, Callaghan, NSW 2308, Australia.
| | - Mahinda K Arachchi
- Psychiatric Rehabilitation Service, Hunter New England Mental Health, Morisset, NSW 2264, Australia
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Bickerton L, Kuriakose JL. Management of Cholinergic Rebound After Abrupt Withdrawal of Clozapine: A Case Report and Systematic Literature Review. J Acad Consult Liaison Psychiatry 2024; 65:76-88. [PMID: 37838358 DOI: 10.1016/j.jaclp.2023.10.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 09/13/2023] [Accepted: 10/06/2023] [Indexed: 10/16/2023]
Abstract
BACKGROUND Cholinergic discontinuation symptoms, also known as "cholinergic rebound," from abrupt clozapine discontinuation are characterized by a range of somatic and psychiatric symptoms. OBJECTIVE The objective of this study was to describe the clinical features and management options for clozapine withdrawal-associated cholinergic rebound syndrome (henceforth referred to as CWCRS) and present an illustrative case report. METHODS Based on a literature search of the databases PubMed, OVID Medline, and Embase as well as reviewing reference lists of relevant past reviews, we carried out a systematic review of case reports on the management of CWCRS from 1946 to 2023. RESULTS We identified 10 previously published articles on the clinical management of CWCRS, with a total of 18 patients (6 female, 12 male) with an average age of 43 years (standard deviation 14). Half of the patients had a history of tardive dyskinesia. The mean dose of clozapine before discontinuation was 351 mg/day, with duration of clozapine treatment ranging from 3 weeks to 9 years. Clozapine was the most effective treatment, followed by benztropine. CONCLUSIONS Given the small number of cases and the nonexperimental nature of the available studies, this review could not provide reliable data to guide management of CWCRS. The findings, however, suggest that clozapine may be more effective than other commonly used treatment options. With the high rates of discontinuation among patients on clozapine, there is a pressing need for further research into the epidemiology, natural history, and management of clozapine withdrawal syndromes.
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Affiliation(s)
- Lucy Bickerton
- Northwell Health, Zucker Hillside Hospital, Glen Oaks, NY.
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van der Horst MZ, Meijer Y, de Boer N, Guloksuz S, Hasan A, Siskind D, Wagner E, Okhuijsen-Pfeifer C, Luykx JJ. Comprehensive dissection of prevalence rates, sex differences, and blood level-dependencies of clozapine-associated adverse drug reactions. Psychiatry Res 2023; 330:115539. [PMID: 37988817 DOI: 10.1016/j.psychres.2023.115539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Revised: 09/28/2023] [Accepted: 10/02/2023] [Indexed: 11/23/2023]
Abstract
Clozapine is often underused due to concerns about adverse drug reactions (ADRs) but studies into their prevalences are inconclusive. We therefore comprehensively examined prevalences of clozapine-associated ADRs in individuals with schizophrenia and demographic and clinical factors associated with their occurrence. Data from a multi-center study (n = 698 participants) were collected. The mean number of ADRs during clozapine treatment was 4.8, with 2.4 % of participants reporting no ADRs. The most common ADRs were hypersalivation (74.6 %), weight gain (69.3 %), and increased sleep necessity (65.9 %), all of which were more common in younger participants. Participants with lower BMI prior to treatment were more likely to experience significant weight gain (>10 %). Constipation occurred more frequently with higher clozapine blood levels and doses. There were no differences in ADR prevalence rates between participants receiving clozapine monotherapy and polytherapy. These findings emphasize the high prevalence of clozapine-associated ADRs and highlight several demographic and clinical factors contributing to their occurrence. By understanding these factors, clinicians can better anticipate and manage clozapine-associated ADRs, leading to improved treatment outcomes and patient well-being.
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Affiliation(s)
- Marte Z van der Horst
- Department of Psychiatry, University Medical Center Utrecht, Utrecht, the Netherlands; Department of Translational Neuroscience, University Medical Center Utrecht, Utrecht, the Netherlands,; GGNet, Warnsveld, the Netherlands.
| | - Yoeki Meijer
- Department of Psychiatry, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Nini de Boer
- Department of Psychiatry, University Medical Center Utrecht, Utrecht, the Netherlands; Department of Translational Neuroscience, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Sinan Guloksuz
- Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience, Maastricht University Medical Centre, Maastricht, the Netherlands; Department of Psychiatry, Yale University School of Medicine, New Haven, CT
| | - Alkomiet Hasan
- Department of Psychiatry, Psychotherapy and Psychosomatics, Medical Faculty, University of Augsburg, Augsburg, Germany
| | - Dan Siskind
- Metro South Addiction and Mental Health Service, Brisbane, Australia; Faculty of Medicine, University of Queensland, Brisbane, Australia
| | - Elias Wagner
- Department of Psychiatry, Psychotherapy and Psychosomatics, Medical Faculty, University of Augsburg, Augsburg, Germany; Evidence-based Psychiatry and Psychotherapy, Faculty of Medicine, University of Augsburg, Augsburg, Germany
| | | | - Jurjen J Luykx
- Department of Psychiatry, University Medical Center Utrecht, Utrecht, the Netherlands; Department of Translational Neuroscience, University Medical Center Utrecht, Utrecht, the Netherlands,; GGNet, Warnsveld, the Netherlands; Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience, Maastricht University Medical Centre, Maastricht, the Netherlands
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12
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Oloyede E, Dima A, Taylor D, Cheung H, Dzahini O, Shergill S, Whiskey E. Clozapine augmentation with long-acting antipsychotic injections: A case series and systematic review. Acta Psychiatr Scand 2023; 148:538-552. [PMID: 37899506 DOI: 10.1111/acps.13621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 08/17/2023] [Accepted: 09/24/2023] [Indexed: 10/31/2023]
Abstract
BACKGROUND Up to 30% of patients with a diagnosis of treatment-resistant psychosis remain symptomatic despite an optimal trial with the gold standard treatment, clozapine. Emerging evidence suggests the clinical utility of long-acting injections (LAI) in such clinical scenarios. In this study, we aimed to describe clozapine augmentation with LAIs in an inner London hospital and explore the literature on the clinical effectiveness of this treatment modality. METHODS Patients prescribed clozapine, who were commenced on a LAI between 2007 and 2023 by the United Kingdom's largest mental health trust, were identified from electronic patient records. First, routine clinical data were used to describe the use, effectiveness, and safety of this augmentation strategy. Second, we conducted a literature search up to 1st June 2023 to identify published studies describing clinical outcomes after clozapine augmentation with a LAI. Clinical outcomes were collated and presented in a table, including hospitalisation rates and quantitative clinical assessments using validated scales. RESULTS Of the 1248 patients prescribed clozapine in SLaM, three patients (0.2%) received augmentation with the following LAIs: olanzapine embonate, paliperidone palmitate and pipotiazine palmitate. This treatment strategy was clinically effective and generally well tolerated in all three cases. Twelve published studies between 2010 and 2022 were included in the review. Eight distinct LAIs were reported (4 first and 4 second generation antipsychotics), with risperidone and paliperidone most widely studied. All the identified studies were observational including mirror-image studies, case series and case reports. Duration of follow up varied from 3 months to 3 years. There was evidence that the use of LAIs with clozapine can significantly reduce clinical symptoms, hospitalisation rates and bed days. No serious adverse effects were reported. CONCLUSION This preliminary evidence suggests clinical utility of LAIs in alleviating residual symptoms and subsequently reducing hospitalisation rates in patients optimised on clozapine treatment. The current study warrants further investigations including a randomised controlled study to establish the clinical efficacy, tolerability, and place in therapy of this treatment modality.
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Affiliation(s)
- Ebenezer Oloyede
- Pharmacy Department, South London and Maudsley NHS Foundation Trust, London, UK
- Department of Psychiatry, University of Oxford, Warneford Hospital, Oxford, UK
| | - Aikaterini Dima
- Pharmacy Department, South London and Maudsley NHS Foundation Trust, London, UK
- Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
| | - David Taylor
- Pharmacy Department, South London and Maudsley NHS Foundation Trust, London, UK
- Institute of Pharmaceutical Science, King's College London, London, UK
| | - Henry Cheung
- Pharmacy Department, South West London and St George's Mental Health NHS Trust, London, UK
| | - Olubanke Dzahini
- Pharmacy Department, South London and Maudsley NHS Foundation Trust, London, UK
- Institute of Pharmaceutical Science, King's College London, London, UK
| | - Sukhi Shergill
- Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
- Medical School, Kent and Medway NHS and Social Care Partnership Trust, Chatham, UK
| | - Eromona Whiskey
- Pharmacy Department, South London and Maudsley NHS Foundation Trust, London, UK
- Institute of Pharmaceutical Science, King's College London, London, UK
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13
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Lin TC, Lin CH. Schizophrenia Patients Discharged on Clozapine Plus Long-Acting Injectable Antipsychotics From a Public Psychiatric Hospital in Taiwan, 2006-2021. Int J Neuropsychopharmacol 2023; 26:808-816. [PMID: 37616565 PMCID: PMC10674076 DOI: 10.1093/ijnp/pyad053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Accepted: 08/21/2023] [Indexed: 08/26/2023] Open
Abstract
BACKGROUND Some schizophrenia patients treated with clozapine experience an inadequate response and adherence problems. The purpose of this study was to compare time to rehospitalization within 6 months in schizophrenia patients discharged on 3 clozapine regimens. Additionally, the temporal trend of prescription rate in each group was also explored. METHODS Schizophrenia patients discharged from the study hospital from January 1, 2006, to December 31, 2021, (n = 3271) were included in the analysis. The type of clozapine prescribed at discharge was divided into 3 groups: clozapine plus long-acting injectable antipsychotics (clozapine + LAIs), clozapine plus other oral antipsychotics (clozapine + OAPs), and clozapine monotherapy. Survival analysis was used to compare time to rehospitalization within 6 months after discharge among the 3 groups. The temporal trend in the prescription rate of each group was analyzed using the Cochran-Armitage Trend test. RESULTS Patients discharged on clozapine + LAIs had a significantly longer time to rehospitalization than those on clozapine + OAPs or clozapine monotherapy. The prescription rates of clozapine + LAIs and clozapine + OAPs significantly increased over time, whereas the prescription rates of clozapine monotherapy significantly decreased. CONCLUSIONS Compared with the clozapine + OAPs group, the clozapine + LAIs group had a lower risk of rehospitalization and a lower dose of clozapine prescribed. Therefore, if a second antipsychotic is required for patients who are taking clozapine alone, LAIs should be considered earlier.
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Affiliation(s)
- Ta-Chun Lin
- Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan
| | - Ching-Hua Lin
- Kaohsiung Municipal Kai-Syuan Psychiatric Hospital, Kaohsiung, Taiwan
- Department of Psychiatry, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Post-Baccalaureate Medicine, College of Medicine, National Sun Yat-sen University, Kaohsiung, Taiwan
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14
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Wang T, Codling D, Bhugra D, Msosa Y, Broadbent M, Patel R, Roberts A, McGuire P, Stewart R, Dobson R, Harland R. Unraveling ethnic disparities in antipsychotic prescribing among patients with psychosis: A retrospective cohort study based on electronic clinical records. Schizophr Res 2023; 260:168-179. [PMID: 37669576 PMCID: PMC10881407 DOI: 10.1016/j.schres.2023.08.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 07/11/2023] [Accepted: 08/27/2023] [Indexed: 09/07/2023]
Abstract
BACKGROUND Previous studies have shown mixed evidence on ethnic disparities in antipsychotic prescribing among patients with psychosis in the UK, partly due to small sample sizes. This study aimed to examine the current state of antipsychotic prescription with respect to patient ethnicity among the entire population known to a large UK mental health trust with non-affective psychosis, adjusting for multiple potential risk factors. METHODS This retrospective cohort study included all patients (N = 19,291) who were aged 18 years or over at their first diagnoses of non-affective psychosis (identified with the ICD-10 codes of F20-F29) recorded in electronic health records (EHRs) at the South London and Maudsley NHS Trust until March 2021. The most recently recorded antipsychotic treatments and patient attributes were extracted from EHRs, including both structured fields and free-text fields processed using natural language processing applications. Multivariable logistic regression models were used to calculate the odds ratios (OR) for antipsychotic prescription according to patient ethnicity, adjusted for multiple potential contributing factors, including demographic (age and gender), clinical (diagnoses, duration of illness, service use and history of cannabis use), socioeconomic factors (level of deprivation and own-group ethnic density in the area of residence) and temporal changes in clinical guidelines (date of prescription). RESULTS The cohort consisted of 43.10 % White, 8.31 % Asian, 40.80 % Black, 2.64 % Mixed, and 5.14 % of patients from Other ethnicity. Among them, 92.62 % had recorded antipsychotic receipt, where 24.05 % for depot antipsychotics and 81.72 % for second-generation antipsychotic (SGA) medications. Most ethnic minority groups were not significantly different from White patients in receiving any antipsychotic. Among those receiving antipsychotic prescribing, Black patients were more likely to be prescribed depot (adjusted OR 1.29, 95 % confidence interval (CI) 1.14-1.47), but less likely to receive SGA (adjusted OR 0.85, 95 % CI 0.74-0.97), olanzapine (OR 0.82, 95 % CI 0.73-0.92) and clozapine (adjusted OR 0.71, 95 % CI 0.6-0.85) than White patients. All the ethnic minority groups were less likely to be prescribed olanzapine than the White group. CONCLUSIONS Black patients with psychosis had a distinct pattern in antipsychotic prescription, with less use of SGA, including olanzapine and clozapine, but more use of depot antipsychotics, even when adjusting for the effects of multiple demographic, clinical and socioeconomic factors. Further research is required to understand the sources of these ethnic disparities and eliminate care inequalities.
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Affiliation(s)
- Tao Wang
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, Denmark Hill, London SE5 8AF, United Kingdom.
| | - David Codling
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, Denmark Hill, London SE5 8AF, United Kingdom; South London and Maudsley National Health Service (NHS) Foundation Trust, Denmark Hill, London SE5 8AZ, United Kingdom
| | - Dinesh Bhugra
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, Denmark Hill, London SE5 8AF, United Kingdom
| | - Yamiko Msosa
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, Denmark Hill, London SE5 8AF, United Kingdom
| | - Matthew Broadbent
- South London and Maudsley National Health Service (NHS) Foundation Trust, Denmark Hill, London SE5 8AZ, United Kingdom
| | - Rashmi Patel
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, Denmark Hill, London SE5 8AF, United Kingdom; South London and Maudsley National Health Service (NHS) Foundation Trust, Denmark Hill, London SE5 8AZ, United Kingdom
| | - Angus Roberts
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, Denmark Hill, London SE5 8AF, United Kingdom; South London and Maudsley National Health Service (NHS) Foundation Trust, Denmark Hill, London SE5 8AZ, United Kingdom
| | - Philip McGuire
- Department of Psychiatry, University of Oxford, Oxford, United Kingdom; Oxford Health, Oxford Health NHS Foundation Trust, Oxford, United Kingdom
| | - Robert Stewart
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, Denmark Hill, London SE5 8AF, United Kingdom; South London and Maudsley National Health Service (NHS) Foundation Trust, Denmark Hill, London SE5 8AZ, United Kingdom
| | - Richard Dobson
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, Denmark Hill, London SE5 8AF, United Kingdom; South London and Maudsley National Health Service (NHS) Foundation Trust, Denmark Hill, London SE5 8AZ, United Kingdom; Institute of Health Informatics, University College London, Euston Road, London NW1 2DA, United Kingdom; Health Data Research UK London, University College London, Euston Road, London NW1 2DA, United Kingdom
| | - Robert Harland
- South London and Maudsley National Health Service (NHS) Foundation Trust, Denmark Hill, London SE5 8AZ, United Kingdom
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15
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Grover S, Chaurasiya N, Chakrabarti S. Clinician Reasons for Stopping Clozapine: A Retrospective Cohort Study. J Clin Psychopharmacol 2023; 43:403-406. [PMID: 37683227 DOI: 10.1097/jcp.0000000000001735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 07/28/2023]
Abstract
BACKGROUND Little information is available on clozapine discontinuation rates in developing country settings. AIM The present study aimed to evaluate the incidence and reasons clinicians stopped clozapinine in patients after initiating treatment with the same. In addition, the study also aimed to assess the rechallenge rate, that is, restarting clozapine after a decision to discontinue the same by the clinicians. METHODOLOGY The treatment records of 859 patients started on clozapine were reviewed to identify the patients for whom the clinician stopped clozapine at least once because of any reason. The reasons for stopping clozapine were reviewed. In addition, the treatment records were also examined for rechallenge with clozapine at a later date. RESULTS Clozapine was stopped by the clinicians in 44 of the 859 patients (5.12%). The most common reason for stopping clozapine was blood dyscrasias (n = 12), followed by poor adherence making the hematological monitoring difficult (n = 9), and intolerable sedation (n = 7). In half of the patients (n = 22), clozapine was restarted by the clinicians for further management of schizophrenia. Successful rechallenge was done in 58.33% of patients with blood dyscrasias, 44.44% with poor adherence, and 71.4% with intolerable sedation. CONCLUSIONS The present study suggests clinicians stop clozapine in only 5.14% of cases. The most common reasons for clozapine discontinuation by clinicians include blood dyscrasias, poor medication adherence making it challenging to monitor the hemogram, and sedation. However, in half of the patient's clozapine was rechallenged, and all the attempts of rechallenging were successful.
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Affiliation(s)
- Sandeep Grover
- From the Department of Psychiatry, Postgraduate Institute of Medical Education and Research, Chandigarh, India
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16
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Oloyede E, Dunnett D, Taylor D, Clark I, MacCabe JH, Whiskey E, Onwumere J. The lived experience of clozapine discontinuation in patients and carers following suspected clozapine-induced neutropenia. BMC Psychiatry 2023; 23:413. [PMID: 37291505 PMCID: PMC10249299 DOI: 10.1186/s12888-023-04902-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Accepted: 05/25/2023] [Indexed: 06/10/2023] Open
Abstract
BACKGROUND Clozapine is the treatment of choice in refractory psychosis. In most countries, clozapine must be stopped indefinitely if white blood cells fall below a defined threshold during routine monitoring. Despite evidence of severe adverse consequences of clozapine discontinuation, published accounts on the lived experiences and perspectives of patients and carers are scarce. METHOD We completed semi-structured interviews with patients (n = 4) and family carers (n = 4) on experiences of clozapine cessation following suspected drug-induced neutropenia. Interviews were audio-recorded, transcribed and analysed thematically. RESULTS The two overarching themes comprised:(i) stress of clozapine below threshold neutrophil results and (ii) patient and carer priorities. CONCLUSIONS There is a suggested need for evidence-based pharmacological and psychological approaches to support patients and carers after clozapine cessation. Such approaches will minimise the potentially negative physical and emotional sequela in the aftermath of a below threshold neutrophil result and reduce the likelihood of experiencing additional health and social inequalities after clozapine discontinuation.
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Affiliation(s)
- Ebenezer Oloyede
- Pharmacy Department, South London and Maudsley NHS Foundation Trust, London, UK.
- Department of Psychosis Studies, Institute of Psychiatry, Psychology & Neuroscience, King's College London, King's College London, London, UK.
- University of Oxford, Department of Psychiatry , Warneford, United Kingdom.
| | - Danielle Dunnett
- Department of Psychosis Studies, Institute of Psychiatry, Psychology & Neuroscience, King's College London, King's College London, London, UK
| | - David Taylor
- Pharmacy Department, South London and Maudsley NHS Foundation Trust, London, UK
- Institute of Pharmaceutical Science, King's College, London 5th Floor, Franklin-Wilkins Building 150 Stamford Street, London, SE1 9NH, UK
| | - Ivana Clark
- Pharmacy Department, South London and Maudsley NHS Foundation Trust, London, UK
- Institute of Pharmaceutical Science, King's College, London 5th Floor, Franklin-Wilkins Building 150 Stamford Street, London, SE1 9NH, UK
| | - James H MacCabe
- Department of Psychosis Studies, Institute of Psychiatry, Psychology & Neuroscience, King's College London, King's College London, London, UK
- National Psychosis Service, South London and Maudsley NHS Foundation Trust, London, UK
- NIHR Biomedical Research Centre for Mental Health South London and Maudsley NHS, London, UK
| | - Eromona Whiskey
- Pharmacy Department, South London and Maudsley NHS Foundation Trust, London, UK
- Institute of Pharmaceutical Science, King's College, London 5th Floor, Franklin-Wilkins Building 150 Stamford Street, London, SE1 9NH, UK
- National Psychosis Service, South London and Maudsley NHS Foundation Trust, London, UK
| | - Juliana Onwumere
- National Psychosis Service, South London and Maudsley NHS Foundation Trust, London, UK
- NIHR Biomedical Research Centre for Mental Health South London and Maudsley NHS, London, UK
- Department of Psychology, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
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Grover S, Mishra E, Chakrabarti S. Dropout rates and reasons for dropout among patients receiving clozapine. Indian J Psychiatry 2023; 65:680-686. [PMID: 37485413 PMCID: PMC10358823 DOI: 10.4103/indianjpsychiatry.indianjpsychiatry_819_22] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 03/05/2023] [Accepted: 05/06/2023] [Indexed: 07/25/2023] Open
Abstract
Background and Aim The present study aimed to assess the treatment dropout rates, reasons for treatment dropout, and clozapine discontinuation rate among patients attending a tertiary care center in North India. Materials and Methods Clozapine data bank was used to identify patients on clozapine, and their treatment records were reviewed for the period Jan 2020-March 2020. Patients who did not follow-up at least once in the last 6 months were considered to have dropped out and were contacted telephonically to understand the reasons for dropout. Treatment records of those following up regularly were reviewed to check if clozapine was discontinued and if so, the reason for the same was evaluated. Results Out of 671 patients on clozapine, 495 (73.8%) were still on regular follow-up and the remaining 176 (26.2%) had dropped out of treatment. Out of the 176 patients who had dropped out of treatment, 84 could be contacted. Common reasons for dropout were long distance from the hospital (n = 27), long waiting time for consultation (n = 8), no benefit with treatment (n = 17), side effects with medication (n = 10), moving away to another place (n = 6), refusal by the patient to follow-up (n = 7), patient improved and so did not feel the need to continue treatment (n = 7), and other reasons (n = 37). Conclusion About one-fourth of patients who had started treatment with clozapine dropped out from the treatment. The most common reasons for dropout from treatment included long distance from the hospital and no benefit from treatment.
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Affiliation(s)
- Sandeep Grover
- Department of Psychiatry, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Eepsita Mishra
- Department of Psychiatry, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Subho Chakrabarti
- Department of Psychiatry, Post Graduate Institute of Medical Education and Research, Chandigarh, India
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Southern J, Elliott P, Maidment I. What are patients' experiences of discontinuing clozapine and how does this impact their views on subsequent treatment? BMC Psychiatry 2023; 23:353. [PMID: 37217959 DOI: 10.1186/s12888-023-04851-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 05/07/2023] [Indexed: 05/24/2023] Open
Abstract
BACKGROUND Discontinuing what is considered the most effective treatment for treatment-resistant schizophrenia may precipitate feelings of failure or a relapse of illness. Clozapine treatment is discontinued for a variety of reasons, including non-adherence, intolerance, or lack of efficacy. Patients' experiences of discontinuing the "best" treatment and the impact on perceptions of subsequent antipsychotic treatment are important in developing an understanding of the factors affecting people's treatment choices. This study is the first of its type, seeking to explore people's perspectives on clozapine discontinuation. METHOD Semi-structured interviews with sixteen patients who had received clozapine and discontinued treatment-thirteen males and three females, age range: thirty-two to seventy-eight years old-were audio-recorded and transcribed. A modified inductive approach to analysis, based on grounded theory, was taken to identify commonalities and differences in patients' perceptions. RESULTS The three main themes identified from participants' experiences were: (1) positive and negative effects of treatment; (2) feelings of agency, being the capacity to make decisions about treatment and act independently; (3) choice of treatment in the future. Participants exhibited agency in making choices about medication, including risking relapse, while attempting self-management of medication effects. Different participants perceived the same side effect as beneficial or intolerable. Variation in subsequent treatment choices was reported, with some participants favouring depot (long-acting) injections. A participant was frightened when not told about clozapine's side effects, which led to the participant not being engaged in future treatment decisions. Others, despite suffering serious adverse effects, retained positive perceptions of clozapine; they experienced despair at finding an effective alternative. CONCLUSIONS Experiences with clozapine discontinuation evoked powerful emotions and resulted in clozapine being the benchmark for other treatments. Knowledge, agency, and being in control were important to participants in relation to treatment. Personal perceptions of treatments or beliefs about illness could lead to non-adherence. People value the clinician listening to their experiences to better understand their perspective, enabling concerns about medication to be addressed through true shared decision making. TRIAL REGISTRATION NHS Health Research Authority and Health and Care Research Wales, IRAS Project ID 225753, Research Ethics Committee (REC) reference: 18/NW/0413, 25/06/2018.
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Affiliation(s)
- Jennifer Southern
- Aston University, Birmingham, B4 7ET, England.
- Cheshire and Wirral Partnership NHS Foundation Trust, Chester, CH2 1BQ, England.
| | - Phil Elliott
- Cheshire and Wirral Partnership NHS Foundation Trust, Chester, CH2 1BQ, England
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19
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John AP, Stanley S, Haywood D. Rates and Reasons for Clozapine Treatment Interruptions: Impact of the Frequency of Hematologic Monitoring and Cardiac Adverse Events. J Clin Psychopharmacol 2023; 43:233-238. [PMID: 37126829 DOI: 10.1097/jcp.0000000000001673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
BACKGROUND Differing rates and reasons for interruptions of clozapine treatment have been reported globally. This article evaluated the rates and reasons for clozapine therapy interruptions in Australia and explored the impact of the frequency of hematological monitoring on these parameters. METHODS Data of the patients who were newly commenced on clozapine at three metropolitan public mental health services in Western Australia over 11 years were retrospectively collated. The rate and reasons for clozapine therapy interruptions and their association with the frequency of hematological monitoring, age, sex, and treatment site were analyzed using parametric, nonparametric, and correlational analyses. RESULTS Of the 457 patients whose data were collected, 69.6% had an interruption of treatment with 41.2% of those occurring during the period of mandatory weekly hematological monitoring in the first 18 weeks. Nonadherence (57.4%) and adverse effects (28.8%) were the 2 main reasons for the treatment interruptions. Cardiac issues accounted for the majority of the interruptions (61.8%) due to specified adverse effects, and these occurred significantly more commonly within the first 18 weeks. Location, age, and sex did not predict the possibility of treatment interruptions. CONCLUSIONS The high rates of clozapine treatment interruption observed during the period of weekly monitoring point toward the need to address the burden of frequent hematological monitoring for patients. Disproportionately higher rates of interruption due to cardiac adverse effects observed in this study compared with research from non-Australian settings raise the possibility of geographical differences in the adverse effects leading to treatment discontinuation.
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Combination of two long-acting injectable antipsychotics in treatment-resistant schizophrenia: A retrospective 12-month mirror-image study. Asian J Psychiatr 2023; 80:103402. [PMID: 36563612 DOI: 10.1016/j.ajp.2022.103402] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 12/05/2022] [Accepted: 12/08/2022] [Indexed: 12/15/2022]
Abstract
To evaluate the efficacy and tolerability of the combination of two long-acting injections of antipsychotics (dual-LAIs) in non-adherent and resistant schizophrenia. Efficacy and tolerability were assessed in 13 patients admitted to a French hospital, using a retrospective 12-month mirror-image design. The number and total duration of hospitalizations significantly decreased after introducing dual-LAIs (2.6 vs. 1.3, P = 0.017; 142 days vs. 95 days, P = 0.046). The average duration of each hospitalization did not differ. No significant differences were observed in tolerance outcomes (body mass index, agranulocytosis, lipid profile, sugar levels). Patients with treatment-resistant schizophrenia and poor medication adherence can derive significant clinical benefits from dual-LAIs.
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Jakobsen MI, Schaug JP, Nielsen J, Simonsen E. Antipsychotic prescribing practices for outpatients with schizophrenia and reasons for non-clozapine treatment - Data from a Danish quality assessment audit. Nord J Psychiatry 2023:1-10. [PMID: 36651766 DOI: 10.1080/08039488.2022.2160878] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
BACKGROUND Clozapine is the gold standard for treating treatment-resistant schizophrenia (TRS) although widely underutilised. Both organisational, patient- and clinician related reasons for the underutilisation have been reported, however, the clinical impact of either in real-world settings is not fully elucidated. AIM This audit aimed to evaluate the local antipsychotic (AP) prescribing practices for outpatients with schizophrenia and to assess the spectrum and prevalence of journalised reasons for non-clozapine treatment amongst eligible outpatients. METHODS Data on demographics, current and former AP treatments, as well as documented reasons for non-clozapine treatment, was extracted through chart audit. RESULTS Of the 668 affiliated outpatients with schizophrenia, 43% were treated with AP polytherapy (APP) and 19.6% with clozapine. The most prevalent reason for clozapine discontinuation was related to side effects whereas the most prevalent reason for refusal or omission of clozapine treatment was related to the associated monitoring regimen. CONCLUSIONS This audit showed that APP prescribing is a highly prevalent practice in our services when treating outpatients with schizophrenia and that clozapine is underutilised in a 'last resort' manner. The blood-monitoring regimen associated with clozapine treatment was found to be an important factor in the underutilisation. It seemed, however, that the monitoring constituted a barrier for different reasons, requiring different approaches to remedy. Future studies, directly involving both patients and clinicians in the identification and management of the most clinically relevant barriers and their corresponding facilitators, are warranted.
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Affiliation(s)
- Michelle I Jakobsen
- The Mental Health Services East, Region Zealand Psychiatry, Roskilde, Denmark.,Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Julie P Schaug
- Psychiatric Research Unit, Centre for Evidence-Based Psychiatry, Region Zealand Psychiatry, Slagelse, Denmark
| | - Jimmi Nielsen
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.,Psychiatric Centre Glostrup, The Mental Health Services in the Capital Region of Denmark, Glostrup, Denmark
| | - Erik Simonsen
- The Mental Health Services East, Region Zealand Psychiatry, Roskilde, Denmark.,Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
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Kappel DB, Legge SE, Hubbard L, Willcocks IR, O'Connell KS, Smith RL, Molden E, Andreassen OA, King A, Jansen J, Helthuis M, Owen MJ, O'Donovan MC, Walters JTR, Pardiñas AF. Genomic Stratification of Clozapine Prescription Patterns Using Schizophrenia Polygenic Scores. Biol Psychiatry 2023; 93:149-156. [PMID: 36244804 PMCID: PMC10804961 DOI: 10.1016/j.biopsych.2022.07.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 07/14/2022] [Accepted: 07/19/2022] [Indexed: 11/28/2022]
Abstract
BACKGROUND Treatment-resistant schizophrenia affects approximately 30% of individuals with the disorder. Clozapine is the medication of choice in treatment-resistant schizophrenia, but optimizing administration and dose titration is complex. The identification of factors influencing clozapine prescription and response, including genetics, is of interest in a precision psychiatry framework. METHODS We used linear regression models accounting for demographic, pharmacological, and clinical covariates to determine whether a polygenic risk score (PRS) for schizophrenia would be associated with the highest dose recorded during clozapine treatment. Analyses were performed across 2 independent multiancestry samples of individuals from a UK patient monitoring system, CLOZUK2 (n = 3133) and CLOZUK3 (n = 909), and a European sample from a Norwegian therapeutic drug monitoring service (n = 417). In a secondary analysis merging both UK cohorts, logistic regression models were used to estimate the relationship between schizophrenia PRSs and clozapine doses classified as low, standard, or high. RESULTS After controlling for relevant covariates, the schizophrenia PRS was correlated with the highest clozapine dose on record for each individual across all samples: CLOZUK2 (β = 12.22, SE = 3.78, p = .001), CLOZUK3 (β = 12.73, SE = 5.99, p = .034), and the Norwegian cohort (β = 46.45, SE = 18.83, p = .014). In a secondary analysis, the schizophrenia PRS was associated with taking clozapine doses >600 mg/day (odds ratio = 1.279, p = .006). CONCLUSIONS The schizophrenia PRS was associated with the highest clozapine dose prescribed for an individual in records from 3 independent samples, suggesting that the genetic liability for schizophrenia might index factors associated with therapeutic decisions in cohorts of patients with treatment-resistant schizophrenia.
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Affiliation(s)
- Djenifer B Kappel
- MRC Centre for Neuropsychiatric Genetics and Genomics, Division of Psychological Medicine and Clinical Neurosciences, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Sophie E Legge
- MRC Centre for Neuropsychiatric Genetics and Genomics, Division of Psychological Medicine and Clinical Neurosciences, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Leon Hubbard
- MRC Centre for Neuropsychiatric Genetics and Genomics, Division of Psychological Medicine and Clinical Neurosciences, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Isabella R Willcocks
- MRC Centre for Neuropsychiatric Genetics and Genomics, Division of Psychological Medicine and Clinical Neurosciences, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Kevin S O'Connell
- Norwegian Centre for Mental Disorders Research, Division of Mental Health and Addiction, University of Oslo and Oslo University Hospital, Oslo, Norway
| | - Robert L Smith
- Norwegian Centre for Mental Disorders Research, Division of Mental Health and Addiction, University of Oslo and Oslo University Hospital, Oslo, Norway; Center for Psychopharmacology, Diakonhjemmet Hospital, Oslo, Norway
| | - Espen Molden
- Section for Pharmacology and Pharmaceutical Biosciences, Department of Pharmacy, University of Oslo, Oslo, Norway; Center for Psychopharmacology, Diakonhjemmet Hospital, Oslo, Norway
| | - Ole A Andreassen
- Norwegian Centre for Mental Disorders Research, Division of Mental Health and Addiction, University of Oslo and Oslo University Hospital, Oslo, Norway
| | - Adrian King
- Magna Laboratories Ltd., Ross-on-Wye, United Kingdom
| | | | | | - Michael J Owen
- MRC Centre for Neuropsychiatric Genetics and Genomics, Division of Psychological Medicine and Clinical Neurosciences, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Michael C O'Donovan
- MRC Centre for Neuropsychiatric Genetics and Genomics, Division of Psychological Medicine and Clinical Neurosciences, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - James T R Walters
- MRC Centre for Neuropsychiatric Genetics and Genomics, Division of Psychological Medicine and Clinical Neurosciences, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Antonio F Pardiñas
- MRC Centre for Neuropsychiatric Genetics and Genomics, Division of Psychological Medicine and Clinical Neurosciences, School of Medicine, Cardiff University, Cardiff, United Kingdom.
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23
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Ord KL, Marais B. Clozapine use at a specialised psychiatric hospital in Johannesburg. S Afr J Psychiatr 2023; 29:1999. [PMID: 37151370 PMCID: PMC10157415 DOI: 10.4102/sajpsychiatry.v29i0.1999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 02/13/2023] [Indexed: 05/09/2023] Open
Abstract
Background Clozapine is the gold standard medication for treatment-resistant psychosis, with robust evidence supporting its efficacy in multiple symptom domains. However, clozapine's side effect profile contributes to its underutilisation and discontinuation. Aim This study aimed to explore the magnitude of clozapine use and describe factors that impact on its effective use among in-patients. Setting Tara Hospital, a specialised psychiatric hospital in Johannesburg. Methods This was a retrospective, cross-sectional file review of clozapine-treated patients admitted over the 2-year study period. Data variables included: demographics, clinical information, discharge prescription, clozapine-related side effects and details of clozapine discontinuation, where applicable. Results A cohort of 33.2% of patients from Tara's biological wards received a trial of clozapine. Participants experienced anti-cholinergic clozapine-related side effects that included weight gain (79.5%), tachycardia (35.2%) and constipation (35.2%). Clozapine was discontinued in 13.7% of participants, and no life-threatening side effects or deaths occurred. Significantly more use of flupenthixol decanoate (64.3% vs. 30.7%; p = 0.0322) and anticholinergics (35.7% vs. 11.4%; p = 0.0474) occurred in the clozapine-discontinued group. Polypharmacy rates were high for psychiatric and non-psychiatric medications. Conclusion One-third of patients received clozapine trials, most of whom continued at discharge. Although side effects occurred frequently, life-threatening side effects did not. Clozapine monitoring protocols, side effect rating scales, pre-emptive management of side effects, lifestyle interventions and clinician education may improve outcomes of clozapine use. The use of plasma clozapine levels may be beneficial. Contribution This study expands our limited knowledge regarding current clozapine prescribing trends in South Africa.
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Affiliation(s)
- Katherine L Ord
- Department of Psychiatry, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Belinda Marais
- Department of Psychiatry, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
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24
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Atkins M, McGuire P, Balgobin B, Desouza N, Taylor D. Haematological point of care testing for clozapine monitoring. J Psychiatr Res 2023; 157:66-71. [PMID: 36442408 DOI: 10.1016/j.jpsychires.2022.11.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 10/17/2022] [Accepted: 11/21/2022] [Indexed: 11/24/2022]
Abstract
BACKGROUND Clozapine treatment requires regular full blood counts (FBC) because of the risk of agranulocytosis. Traditionally, FBCs use venous blood samples but the need for frequent venepuncture adversely affects adherence. We investigated the utility of a point of care testing (POCT) finger prick method for clozapine patients. METHOD Patients being treated with clozapine, who were having a venous blood sample taken for haematological monitoring, also provided a fingerprick capillary blood sample. The PixCell HemoScreen® POCT analyser was used to test both the capillary and venous samples, and the venous sample was also tested using a standard laboratory method. RESULTS We completed FBCs on 226 patients. We found strong correlations between the results from the standard laboratory venous method and the POCT capillary and venous assays for WBC (R = 0.96 & R = 0.99), neutrophils (R = 0.96 & R = 0.97) and eosinophils (R = 0.94 & R = 0.94). Compared with the standard laboratory venous blood method, mean biases for capillary blood POCT method were -0.56 × 109/L for WBC, -0.39 × 109/L for neutrophils, and -0.01 × 109/L for eosinophils. Mean biases for venous blood POCT method were -0.004 × 109/L for WBC, -0.28 × 109/L for neutrophils, and 0.01 × 109/L for eosinophils. Of the 226 patients tested, 10 (4.4%) had levels below clozapine monitoring thresholds (WBC <3.5 × 109/L and Neutrophils <1.5 × 109/L) by capillary blood, and 4 (1.8%) by venous blood by POCT. The standard laboratory method showed 3 of these to be sub-threshold. All cases of neutropenia were identified by capillary and venous POCT. CONCLUSION The PixCell HemoScreen® POCT analyser provided results that were comparable with those from a standard venous blood laboratory method for WBC, neutrophil and eosinophil counts. The availability of an accurate capillary monitoring method may result in increased clozapine uptake and better clozapine adherence.
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Affiliation(s)
- Matthew Atkins
- South London and Maudsley NHS Foundation Trust, Pharmacy Department Maudsley Hospital, Denmark Hill, London, SE5 8AZ, UK; Department of Psychiatry, University of Oxford, Warneford Hospital, Oxford, OX3 7JX, UK.
| | - Philip McGuire
- Department of Psychiatry, University of Oxford, Warneford Hospital, Oxford, OX3 7JX, UK
| | - Bhirundra Balgobin
- South London and Maudsley NHS Foundation Trust, Clozapine Clinic Maudsley Hospital, Denmark Hill, London, SE5 8AZ, UK
| | - Neville Desouza
- South London and Maudsley NHS Foundation Trust, Pharmacy Department Maudsley Hospital, Denmark Hill, London, SE5 8AZ, UK
| | - David Taylor
- South London and Maudsley NHS Foundation Trust, Pharmacy Department Maudsley Hospital, Denmark Hill, London, SE5 8AZ, UK; Institute of Pharmaceutical Science, King's College, Stamford Street, London, SE1 9NH, UK
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25
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Qubad M, Bittner RA. Second to none: rationale, timing, and clinical management of clozapine use in schizophrenia. Ther Adv Psychopharmacol 2023; 13:20451253231158152. [PMID: 36994117 PMCID: PMC10041648 DOI: 10.1177/20451253231158152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 01/24/2023] [Indexed: 03/31/2023] Open
Abstract
Despite its enduring relevance as the single most effective and important evidence-based treatment for schizophrenia, underutilization of clozapine remains considerable. To a substantial degree, this is attributable to a reluctance of psychiatrists to offer clozapine due to its relatively large side-effect burden and the complexity of its use. This underscores the necessity for continued education regarding both the vital nature and the intricacies of clozapine treatment. This narrative review summarizes all clinically relevant areas of evidence, which support clozapine's wide-ranging superior efficacy - for treatment-resistant schizophrenia (TRS) and beyond - and make its safe use eminently feasible. Converging evidence indicates that TRS constitutes a distinct albeit heterogeneous subgroup of schizophrenias primarily responsive to clozapine. Most importantly, the predominantly early onset of treatment resistance and the considerable decline in response rates associated with its delayed initiation make clozapine an essential treatment option throughout the course of illness, beginning with the first psychotic episode. To maximize patients' benefits, systematic early recognition efforts based on stringent use of TRS criteria, a timely offer of clozapine, thorough side-effect screening and management as well as consistent use of therapeutic drug monitoring and established augmentation strategies for suboptimal responders are crucial. To minimize permanent all-cause discontinuation, re-challenges after neutropenia or myocarditis should be considered. Owing to clozapine's unique efficacy, comorbid conditions including substance use and most somatic disorders should not dissuade but rather encourage clinicians to consider clozapine. Moreover, treatment decisions need to be informed by the late onset of clozapine's full effects, which for reduced suicidality and mortality rates may not even be readily apparent. Overall, the singular extent of its efficacy combined with the high level of patient satisfaction continues to distinguish clozapine from all other available antipsychotics.
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Affiliation(s)
- Mishal Qubad
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital Frankfurt, Goethe University, Frankfurt am Main, Germany
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26
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Abstract
AIMS Clozapine is licensed for treatment-resistant psychosis and remains underutilised. This may berelated to the stringent haematological monitoring requirements that are mandatory in most countries. We aimed to compare guidelines internationally and develop a novel Stringency Index. We hypothesised that the most stringent countries would have increased healthcare costs and reduced prescription rates. METHOD We conducted a literature review and survey of guidelines internationally. Guideline identification involved a literature review and consultation with clinical academics. We focused on the haematological monitoring parameters, frequency and thresholds for discontinuation and rechallenge after suspected clozapine-induced neutropenia. In addition, indicators reflecting monitoring guideline stringency were scored and visualised using a choropleth map. We developed a Stringency Index with an international panel of clozapine experts, through a modified-Delphi-survey. The Stringency Index was compared to health expenditure per-capita and clozapine prescription per 100 000 persons. RESULTS One hundred twocountries were included, from Europe (n = 35), Asia (n = 24), Africa (n = 20), South America (n = 11), North America (n = 7) and Oceania and Australia (n = 5). Guidelines differed in frequency of haematological monitoring and discontinuation thresholds. Overall, 5% of included countries had explicit guidelines for clozapine-rechallenge and 40% explicitly prohibited clozapine-rechallenge. Furthermore, 7% of included countries had modified discontinuation thresholds for benign ethnic neutropenia. None of the guidelines specified how long haematological monitoring should continue. The most stringent guidelines were in Europe, and the least stringent were in Africa and South America. There was a positive association (r = 0.43, p < 0.001) between a country's Stringency Index and healthcare expenditure per capita. CONCLUSIONS Recommendations on how haematological function should be monitored in patients treated with clozapine vary considerably between countries. It would be useful to standardise guidelines on haematological monitoring worldwide.
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27
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Gupta S, Parkinson SM. Management of sedation due to clozapine. BJPSYCH ADVANCES 2022. [DOI: 10.1192/bja.2022.27] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
Sedation is one of the most common adverse effects of clozapine. Although tolerance develops to some extent, a significant proportion of patients continue to experience sedation and associated negative consequences on their quality of life. Sedation is also one of the most common reasons for the discontinuation of clozapine and it is therefore important to proactively manage it. This article provides brief guidance for clinicians.
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28
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Mishra BR, Agrawal K, Biswas T, Mohapatra D, Nath S, Maiti R. Comparison of Acute Followed by Maintenance ECT vs Clozapine on Psychopathology and Regional Cerebral Blood Flow in Treatment-Resistant Schizophrenia: A Randomized Controlled Trial. Schizophr Bull 2022; 48:814-825. [PMID: 35556138 PMCID: PMC9212098 DOI: 10.1093/schbul/sbac027] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
BACKGROUND AND HYPOTHESIS In treatment-resistant schizophrenia (TRS), Clozapine is only approved treatment with undesirable side-effects, warranting better alternatives. Our hypothesis is acute followed by maintenance Electroconvulsive Therapy (M-ECT) will be comparable in efficacy and safety to Clozapine in TRS. STUDY DESIGN In this open-label trial, 60 TRS patients were randomized equally to M-ECT (following an acute-course) or Clozapine. Positive and Negative Syndrome Scale (PANSS), Clinical Global Impression Schizophrenia Scale (CGI-SCH), Montreal Cognitive Assessment (MoCA), and Global assessment of functioning (GAF) were measured and compared within and between the groups at baseline, 6 weeks, 12 weeks, and 24 weeks. SPECT-CT brain was done at baseline and 24 weeks to compare the changes in regional cerebral perfusion between the groups and correlate with the changes in the outcome-measures. STUDY RESULTS The PANSS-T scores changes from baseline over the observation-points were significant in both M-ECT and clozapine groups (P < .001), with comparatively better reduction with M-ECT (P < .001). Similar trends were observed in PANSS subscales, CGI-SCH and GAF in both groups, with significantly better improvement with M-ECT over the study-period. After 24 weeks, there was significantly better perfusion with M-ECT in bilateral prefrontal and temporal cortices (P < .05). With M-ECT, a positive correlation was found between changes in PANSS-P scores and left-lateral Temporal cortical perfusion (r = .465, P = .017). CONCLUSIONS Acute followed by M-ECT was more effective than clozapine over 6 months in reducing the positive and negative symptoms, general psychopathology, illness-severity, and improving the global functionality in TRS [clinicaltrials.gov: NCT03807882].
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Affiliation(s)
- Biswa Ranjan Mishra
- To whom correspondence should be addressed; Academic Block, Department of Psychiatry, AIIMS, Sijua, Patrapada, PO Dumduma, Bhubaneswar 751019, Odisha, India; tel: +91-9438884220, fax: 0674-2476002, e-mail:
| | - Kanhaiyalal Agrawal
- Department of Nuclear Medicine, All India Institute of Medical Sciences (AIIMS), Bhubaneswar, Odisha, India
| | - Tathagata Biswas
- Department of Psychiatry, All India Institute of Medical Sciences (AIIMS), Bhubaneswar, Odisha, India
| | - Debadatta Mohapatra
- Department of Psychiatry, All India Institute of Medical Sciences (AIIMS), Bhubaneswar, Odisha, India
| | - Santanu Nath
- Department of Psychiatry, All India Institute of Medical Sciences (AIIMS), Deoghar, Jharkhand, India
| | - Rituparna Maiti
- Department of Pharmacology, All India Institute of Medical Sciences (AIIMS), Bhubaneswar, Odisha, India
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Combination With Long-Acting Injectable Antipsychotics and Utilization of Nonstandard Formulations as Compliance Enhancing Methods for Clozapine Users: A Systematic Review and A Case Series. J Clin Psychopharmacol 2022; 42:298-307. [PMID: 35121707 DOI: 10.1097/jcp.0000000000001526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Combining clozapine with a long-acting injectable antipsychotic (LAI) or using different, nonstandard formulations of the compound may improve treatment outcomes. We aimed to investigate the utility of the clozapine-LAI combination and different formulations of clozapine for compliance problems of clozapine treatment, and to describe a case series on the combined treatment. PROCEDURES We conducted a PubMed search with no date restriction. The number and length of hospitalizations, the results of clinical scales, and adverse events were recorded. We also present a case series of 18 patients using the clozapine-LAI combination. Data were collected from the medical charts and electronic records. RESULTS We extracted 9 records describing the use of the clozapine-LAI combination. The case reports and mirror-image studies showed a significant reduction in the number of hospitalizations, length of hospital stays, and number of visits to the emergency department on the combined treatment with no serious adverse events. We included 11 articles for clozapine formulations. The case reports and retrospective data suggested that short-acting intramuscular clozapine was often well tolerated and resulted in an increased acceptance of oral clozapine in the acute phase of illness. In our case series, illness severity and the number of hospitalization per year significantly decreased after the combined treatment, besides a significant improvement in the functioning scores. Hyperprolactinemia and extrapyramidal side effects were reported due to concomitant LAIs. CONCLUSIONS Despite the encouraging evidence, the present data are preliminary and mostly based on retrospective studies, and oral-dissolving tablets or oral liquid formulations of clozapine have insufficient evidence for clinical practice. Well-designed, controlled, follow-up studies are needed for both clozapine-LAI combination and different formulations of clozapine.
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Livermore C, White H, Bailey L, Osborne I, Oloyede E, Dzahini O, Whiskey E. A retrospective case notes review of the effectiveness and tolerability of metoclopramide in the treatment of clozapine-induced hypersalivation (CIH). BMC Psychiatry 2022; 22:277. [PMID: 35443629 PMCID: PMC9019988 DOI: 10.1186/s12888-022-03940-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Accepted: 04/07/2022] [Indexed: 11/10/2022] Open
Abstract
OBJECTIVE The objective of the study is to explore the long-term effectiveness and tolerability of metoclopramide in the treatment of CIH. METHOD This study is a retrospective, observational cohort study of patients prescribed metoclopramide for CIH at the South London & Maudsley (SLaM) NHS Foundation Trust. RESULTS Of the 96 patients identified, 14 patients were eligible for inclusion in our study. Five patients continued treatment with a mean duration of 27 months (SD = 17.8), and one patient continued until transfer with a duration of 3 months. Eight patients discontinued treatment after a mean duration of 8 months. CONCLUSION Metoclopramide may be an effective and tolerated drug in CIH, but more data is required to establish its place in the pharmacotherapy of this condition.
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Affiliation(s)
- Cecilia Livermore
- grid.37640.360000 0000 9439 0839Pharmacy Department, South London and Maudsley NHS Foundation Trust, Denmark Hill, London, SE5 8AZ UK
| | - Hannah White
- grid.37640.360000 0000 9439 0839Pharmacy Department, South London and Maudsley NHS Foundation Trust, Denmark Hill, London, SE5 8AZ UK
| | - Loren Bailey
- grid.37640.360000 0000 9439 0839Pharmacy Department, South London and Maudsley NHS Foundation Trust, Denmark Hill, London, SE5 8AZ UK
| | - Ian Osborne
- grid.37640.360000 0000 9439 0839Pharmacy Department, South London and Maudsley NHS Foundation Trust, Denmark Hill, London, SE5 8AZ UK ,grid.13097.3c0000 0001 2322 6764Institute of Pharmaceutical Sciences, King’s College London, London, UK
| | - Ebenezer Oloyede
- grid.37640.360000 0000 9439 0839Pharmacy Department, South London and Maudsley NHS Foundation Trust, Denmark Hill, London, SE5 8AZ UK ,grid.13097.3c0000 0001 2322 6764Institute of Pharmaceutical Sciences, King’s College London, London, UK ,grid.13097.3c0000 0001 2322 6764Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neurosciences, King’s College London, London, UK
| | - Olubanke Dzahini
- grid.37640.360000 0000 9439 0839Pharmacy Department, South London and Maudsley NHS Foundation Trust, Denmark Hill, London, SE5 8AZ UK ,grid.13097.3c0000 0001 2322 6764Institute of Pharmaceutical Sciences, King’s College London, London, UK
| | - Eromona Whiskey
- Pharmacy Department, South London and Maudsley NHS Foundation Trust, Denmark Hill, London, SE5 8AZ, UK. .,Institute of Pharmaceutical Sciences, King's College London, London, UK.
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31
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Fonseca de Freitas D, Kadra-Scalzo G, Agbedjro D, Francis E, Ridler I, Pritchard M, Shetty H, Segev A, Casetta C, Smart SE, Downs J, Christensen SR, Bak N, Kinon BJ, Stahl D, MacCabe JH, Hayes RD. Using a statistical learning approach to identify sociodemographic and clinical predictors of response to clozapine. J Psychopharmacol 2022; 36:498-506. [PMID: 35212240 PMCID: PMC9066692 DOI: 10.1177/02698811221078746] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
BACKGROUND A proportion of people with treatment-resistant schizophrenia fail to show improvement on clozapine treatment. Knowledge of the sociodemographic and clinical factors predicting clozapine response may be useful in developing personalised approaches to treatment. METHODS This retrospective cohort study used data from the electronic health records of the South London and Maudsley (SLaM) hospital between 2007 and 2011. Using the Least Absolute Shrinkage and Selection Operator (LASSO) regression statistical learning approach, we examined 35 sociodemographic and clinical factors' predictive ability of response to clozapine at 3 months of treatment. Response was assessed by the level of change in the severity of the symptoms using the Clinical Global Impression (CGI) scale. RESULTS We identified 242 service-users with a treatment-resistant psychotic disorder who had their first trial of clozapine and continued the treatment for at least 3 months. The LASSO regression identified three predictors of response to clozapine: higher severity of illness at baseline, female gender and having a comorbid mood disorder. These factors are estimated to explain 18% of the variance in clozapine response. The model's optimism-corrected calibration slope was 1.37, suggesting that the model will underfit when applied to new data. CONCLUSIONS These findings suggest that women, people with a comorbid mood disorder and those who are most ill at baseline respond better to clozapine. However, the accuracy of the internally validated and recalibrated model was low. Therefore, future research should indicate whether a prediction model developed by including routinely collected data, in combination with biological information, presents adequate predictive ability to be applied in clinical settings.
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Affiliation(s)
| | | | - Deborah Agbedjro
- Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| | - Emma Francis
- Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| | - Isobel Ridler
- Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| | - Megan Pritchard
- Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| | - Hitesh Shetty
- Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| | - Aviv Segev
- Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
- Shalvata Mental Health Center, Hod Hasharon, Israel
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Cecilia Casetta
- Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
- Department of Health Sciences, Università degli Studi di Milano, Milan, Italy
| | - Sophie E Smart
- Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
- MRC Centre for Neuropsychiatric Genetics & Genomics, Cardiff University, Cardiff, UK
| | - Johnny Downs
- Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| | | | | | | | - Daniel Stahl
- Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| | - James H MacCabe
- Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| | - Richard D Hayes
- Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
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Monroy-Jaramillo N, Martínez-Magaña JJ, Pérez-Aldana BE, Ortega-Vázquez A, Montalvo-Ortiz J, López-López M. The role of alcohol intake in the pharmacogenetics of treatment with clozapine. Pharmacogenomics 2022; 23:371-392. [PMID: 35311547 DOI: 10.2217/pgs-2022-0006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Clozapine (CLZ) is an atypical antipsychotic reserved for patients with refractory psychosis, but it is associated with a significant risk of severe adverse reactions (ADRs) that are potentiated with the concomitant use of alcohol. Additionally, pharmacogenetic studies have explored the influence of several genetic variants in CYP450, receptors and transporters involved in the interindividual response to CLZ. Herein, we systematically review the current multiomics knowledge behind the interaction between CLZ and alcohol intake, and how its concomitant use might modulate the pharmacogenetics. CYP1A2*1F, *1C and other alleles not yet discovered could support a precision medicine approach for better therapeutic effects and fewer CLZ ADRs. CLZ monitoring systems should be amended and include alcohol intake to protect patients from severe CLZ ADRs.
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Affiliation(s)
- Nancy Monroy-Jaramillo
- Department of Genetics, National Institute of Neurology & Neurosurgery, Manuel Velasco Suárez, La Fama, Tlalpan, Mexico City, 14269, Mexico
| | - José Jaime Martínez-Magaña
- Department of Psychiatry, Division of Human Genetics, Yale University School of Medicine, Orange, West Haven, CT 06477, USA
| | - Blanca Estela Pérez-Aldana
- Doctorado en Ciencias Biológicas y de la Salud, Metropolitan Autonomous University, Campus Xochimilco, Villa Quietud, Coyoacán, Mexico City, 04960, Mexico
| | - Alberto Ortega-Vázquez
- Metropolitan Autonomous University, Campus Xochimilco, Villa Quietud, Coyoacán, Mexico City, 04960, Mexico
| | - Janitza Montalvo-Ortiz
- Department of Psychiatry, Division of Human Genetics, Yale University School of Medicine, Orange, West Haven, CT 06477, USA
| | - Marisol López-López
- Metropolitan Autonomous University, Campus Xochimilco, Villa Quietud, Coyoacán, Mexico City, 04960, Mexico
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John AP, Burrows S, Stanley S, Acabo C, Shymko G, Jaworska A, Velayudhan A. Demographic and clinical characteristics of patients who recommence clozapine following therapy interruptions. Acta Psychiatr Scand 2022; 145:293-300. [PMID: 34963015 DOI: 10.1111/acps.13394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 12/15/2021] [Accepted: 12/18/2021] [Indexed: 11/26/2022]
Abstract
OBJECTIVE The proportion of patients who recommence clozapine after cessation, the time taken to resume clozapine post-cessation, and distinguishing demographic and clinical characteristics of this group have been poorly researched. We evaluated these in the current study. METHOD We retrospectively extracted selected demographic and clinical variables and clozapine treatment interruption and recommencement data up to December 2018 of a cohort of 458 patients who first commenced clozapine between 2006 and 2016. The study was conducted at three Australian health services. RESULTS Of the 310 (69%) patients who had at least one interruption of clozapine treatment, 170 (54.8%) did not resume clozapine, and 140 (45.2%) recommenced it after the first interruption. More than half of those who recommenced did so within a month and 80% by 12 months. Cox regression analysis revealed that age was significantly associated with recommencement, with a 2% decrease in the likelihood of restarting after an interruption for each year later that clozapine was initially commenced (HR = 0.98 95%CI: 0.97, 0.997, p = 0.02). Those who ceased clozapine due to adverse effects were less likely to restart than those who ceased due to noncompliance (HR = 0.63 95%CI: 0.41, 0.97, p = 0.03). More time on clozapine prior to interruption increased the likelihood of restarting it, with each additional month on clozapine increasing this likelihood by 1% (HR = 1.01 95%CI: 1.01, 1.02, p < 0.001). CONCLUSION If the distinguishing demographic and clinical characteristics of the group identified in this study are corroborated through further research, this could further validate the need to identify treatment resistance and commence clozapine early in people with schizophrenia and provide appropriate interventions to those more at risk of permanent discontinuation of clozapine.
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Affiliation(s)
- Alexander Panickacheril John
- Bentley Health Service, Perth, Western Australia, Australia.,University of Western Australia, Perth, Western Australia, Australia
| | - Sally Burrows
- University of Western Australia, Perth, Western Australia, Australia.,Royal Perth Hospital Research Foundation, Perth, Western Australia, Australia
| | - Susanne Stanley
- University of Western Australia, Perth, Western Australia, Australia
| | - Cherry Acabo
- Bentley Health Service, Perth, Western Australia, Australia
| | - Gordon Shymko
- Peel and Rockingham Kwinana Health Service, Cooloongup, South Australia, Australia
| | | | - Ajay Velayudhan
- Fremantle Hospital Health Service, Palmyra DC, Western Australia, Australia
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Tanzer T, Warren N, McMahon L, Barras M, Kisely S, Brooks E, Wong E, Siskind D. Treatment strategies for clozapine-induced nocturnal enuresis and urinary incontinence: a systematic review. CNS Spectr 2022; 28:1-12. [PMID: 35086595 DOI: 10.1017/s1092852922000050] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND Clozapine is the most effective medication for treatment-refractory schizophrenia but is associated with significant adverse drug reactions, including nocturnal enuresis and urinary incontinence. This side effect can be burdensome and lead to medication nonadherence and psychotic relapse. Evidence to guide treatment of clozapine-induced nocturnal enuresis and urinary incontinence is sparse. We therefore aimed to synthesize the evidence base to guide management for clinicians, patients, and their carers. METHODS We systematically searched PubMed, Embase, PsycInfo, CINAHL, and the Cochrane Trial Registry databases from inception to May 2021 for publications on management of clozapine-induced nocturnal enuresis and urinary incontinence using a PROSPERO preregistered search strategy. RESULTS We identified 22 case reports and case series describing 74 patients. Interventions included clozapine dose reduction, nonpharmacological treatment, and pharmacological treatments. Among pharmacological treatments, desmopressin, oxybutynin, trihexyphenidyl, tolterodine, imipramine, amitriptyline, ephedrine, pseudoephedrine, aripiprazole, and verapamil were associated with complete resolution of nocturnal enuresis and urinary incontinence. Balancing evidence for effectiveness against risk of adverse effects, we developed a management framework for clozapine-induced nocturnal enuresis and urinary incontinence. CONCLUSIONS Following assessment of urological, psychiatric, pharmacological, and common comorbid medical issues, first-line treatments should be nonpharmacological, including bathroom alarms, voiding before bedtime, and nocturnal fluid restriction. If these interventions do not provide adequate relief, aripiprazole should be trialed. Desmopressin may be considered for severe refractory cases, but monitoring for hyponatremia is essential.
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Affiliation(s)
- Timothy Tanzer
- Department of Pharmacy, Princess Alexandra Hospital, Brisbane, Queensland, Australia
- Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia
- School of Pharmacy, University of Queensland, Brisbane, Queensland, Australia
| | - Nicola Warren
- Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia
- Metro South Addiction and Mental Health Service, Brisbane, Queensland, Australia
| | - Laura McMahon
- Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia
| | - Michael Barras
- Department of Pharmacy, Princess Alexandra Hospital, Brisbane, Queensland, Australia
- School of Pharmacy, University of Queensland, Brisbane, Queensland, Australia
| | - Steve Kisely
- Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia
- Metro South Addiction and Mental Health Service, Brisbane, Queensland, Australia
- Department of Psychiatry, Dalhousie University, Halifax, Nova Scotia, Canada
- Department of Community Health and Epidemiology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Emily Brooks
- Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia
- Department of Diabetes and Endocrinology, Princess Alexandra Hospital, Brisbane, Queensland, Australia
| | - Emily Wong
- Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia
| | - Dan Siskind
- Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia
- Metro South Addiction and Mental Health Service, Brisbane, Queensland, Australia
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Metabolite Profiling of Clozapine in Patients Switching Versus Maintaining Treatment: A Retrospective Pilot Study. J Clin Psychopharmacol 2022; 42:470-474. [PMID: 35916581 PMCID: PMC9426748 DOI: 10.1097/jcp.0000000000001585] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE/BACKGROUND Pharmacokinetics may be of relevance for the risk of clozapine discontinuation. We compared metabolite profiles, accounting for smoking habits, in patients switching versus maintaining clozapine treatment at therapeutic concentrations. METHODS/PROCEDURES Adult patients with clozapine serum levels above 1070 nmol/L (350 ng/mL) were retrospectively included from a Norwegian therapeutic drug monitoring service during 2018-2020. Inclusion criteria were (1) known smoking habits, (2) blood sample drawn within 10 to 30 hours after last clozapine intake, and (3) detectable levels of N -desmethylclozapine, clozapine -N -oxide, clozapine-5 N -glucuronide, or clozapine- N + - glucuronide. Patients comedicated with cytochrome P450 enzyme inducers, inhibitors, or valproic acid were excluded. The high-resolution mass spectrometry assay enabled detection of 21 clozapine metabolites. Metabolite profiles were compared between patients switching treatment (switchers), measured as clozapine being replaced by another antipsychotic drug in blood samples, versus maintaining clozapine treatment (nonswitchers) during the study period. FINDINGS/RESULTS Of the 84 patients fulfilling the study criteria, 7 patients (8.3%) were identified as clozapine switchers. After correcting for smoking habits, the clozapine-5 N -glucuronide/clozapine ratio was 69% lower ( P < 0.001), while the clozapine- N + -glucuronide/clozapine-5 N -glucuronide ratio was 143% higher ( P = 0.026), respectively, in switchers versus nonswitchers. The other metabolite ratios did not significantly differ between switchers and nonswitchers. IMPLICATIONS/CONCLUSIONS The present study found a significantly reduced 5 N -glucuronidation phenotype in patients switching from clozapine at therapeutic serum concentrations (>1070 nmol/L) to other antipsychotic drugs. This may indicate that glucuronidation, as a potential detoxification mechanism, is related to clozapine tolerability. However, the causality of this observation needs to be investigated in future studies with larger patient populations.
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Johannsen CF, Petersen TS, Nielsen J, Jørgensen A, Jimenez-Solem E, Fink-Jensen A. Clozapine- and non-clozapine-associated neutropenia in patients with schizophrenia: a retrospective cohort study. Ther Adv Psychopharmacol 2022; 12:20451253211072341. [PMID: 35273789 PMCID: PMC8902187 DOI: 10.1177/20451253211072341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 12/14/2021] [Indexed: 11/25/2022] Open
Abstract
INTRODUCTION The antipsychotic drug clozapine remains underutilized partly because of the risk of life-threatening adverse effects, such as neutropenia. Therefore, an extensive hematological monitoring program was set up to detect neutropenia. METHODS In this retrospective cohort study, we used registry-based data from the Capital Region of Denmark to investigate incidence rates of neutropenia among patients with a diagnosis of schizophrenia or other psychotic disorders and treated with clozapine for the first time. In a within-subject design, we compared rates of neutropenia in time periods where patients were exposed to clozapine versus time periods, where they were not exposed to clozapine. We also investigated whether the lengths of clozapine-associated neutropenia (CAN) were related to discontinuation of clozapine treatment. RESULTS Data from 520 clozapine users were included. The incidence rate of CAN was 3.2 cases per 100 person-years (95% confidence interval [CI]: 2.1-4.8) throughout the entire study. There was no significant difference in incidence rates of neutropenia during clozapine exposure and non-clozapine exposure, with an incidence rate ratio of 0.7 (95% CI: 0.4-1.3). One episode of severe neutropenia was detected. Episodes of CAN with only one sub-threshold neutrophil count were not associated with higher clozapine discontinuation (26%) than CAN episodes of more than one sub-threshold neutrophil count (28%). CONCLUSION In the present study, we could not confirm that clozapine treatment was associated with neutropenia.
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Affiliation(s)
- Claas-Frederik Johannsen
- Mental Health Centre Copenhagen, Rigshospitalet, Edel Sauntes Allé 10, 2100 Copenhagen Ø, Denmark
| | - Tonny Studsgaard Petersen
- Department of Clinical Pharmacology, Copenhagen University Hospital Bispebjerg and Frederiksberg, Copenhagen, DenmarkDepartment of Clinical Medicine, University of Copenhagen, Copenhagen N, Denmark
| | - Jimmi Nielsen
- Mental Health Centre Glostrup, Glostrup, Denmark Department of Clinical Medicine, University of Copenhagen, Copenhagen N, Denmark
| | - Anders Jørgensen
- Mental Health Centre Copenhagen, Rigshospitalet, Copenhagen Ø, DenmarkDepartment of Clinical Medicine, University of Copenhagen, Copenhagen N, Denmark
| | - Espen Jimenez-Solem
- Department of Clinical Pharmacology and Copenhagen Phase 4 Unit, Copenhagen University Hospital Bispebjerg and Frederiksberg, Copenhagen, DenmarkDepartment of Clinical Medicine, University of Copenhagen, Copenhagen N, Denmark
| | - Anders Fink-Jensen
- Mental Health Centre Copenhagen, Rigshospitalet, Edel Sauntes Allé 10, 2100 Copenhagen Ø, DenmarkDepartment of Clinical Medicine, University of Copenhagen, Copenhagen N, Denmark
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Tanzer TD, Brouard T, Pra SD, Warren N, Barras M, Kisely S, Brooks E, Siskind D. Treatment strategies for clozapine-induced hypotension: a systematic review. Ther Adv Psychopharmacol 2022; 12:20451253221092931. [PMID: 35633931 PMCID: PMC9136453 DOI: 10.1177/20451253221092931] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 03/22/2022] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Clozapine is the most effective medication for treatment-refractory schizophrenia but is associated with significant adverse drug effects, including hypotension and dizziness, which have a negative impact on quality of life and treatment compliance. Available evidence for the management of clozapine-induced hypotension is scant. OBJECTIVES Due to limited guidance on the safety and efficacy of pharmacological treatments for clozapine-induced hypotension, we set out to systematically review and assess the evidence for the management of clozapine-induced hypotension and provide guidance to clinicians, patients, and carers. DESIGN We undertook a systematic review of the safety and efficacy of interventions for clozapine-induced hypotension given the limited available evidence. DATA SOURCES AND METHODS PubMed, Embase, PsycINFO, CINAHL, and the Cochrane trial Registry were searched from inception to November 2021 for literature on the treatment strategies for clozapine-induced hypotension and dizziness using a PROSPERO pre-registered search strategy. For orthostatic hypotension, we developed a management framework to assist in the choice of intervention. RESULTS We identified nine case studies and four case series describing interventions in 15 patients. Hypotension interventions included temporary clozapine dose reduction, non-pharmacological treatments, and pharmacological treatments. Midodrine, fludrocortisone, moclobemide and Bovril® combination, and etilefrine were associated with improvement in symptoms or reduction in orthostatic hypotension. Angiotensin II, arginine vasopressin, and noradrenaline successfully restored and maintained mean arterial pressure in critical care situations. A paradoxical reaction of severe hypotension was reported with adrenaline use. CONCLUSION Orthostatic hypotension is a common side effect during clozapine titration. Following an assessment of the titration schedule, salt and fluid intake, and review of hypertensive and nonselective α1-adrenergic agents, first-line treatment should be a temporary reduction in clozapine dose or non-pharmacological interventions. If orthostatic hypotension persists, fludrocortisone should be trialled with monitoring of potassium levels and sodium and fluid intake. Midodrine may be considered second-line or where fludrocortisone is contraindicated or poorly tolerated. For patients on clozapine with hypotension in critical care settings, the use of adrenaline to maintain mean arterial pressure should be avoided. REGISTRATION PROSPERO (Registration No. CRD42020191530).
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Affiliation(s)
| | - Thomas Brouard
- Faculty of Medicine, The University of Queensland, Brisbane, QLD, Australia
| | - Samuel Dal Pra
- Metro South Addiction and Mental Health Services, Brisbane, QLD, Australia
| | - Nicola Warren
- Faculty of Medicine, The University of Queensland, Brisbane, QLD, Australia
| | - Michael Barras
- Department of Pharmacy, Princess Alexandra Hospital, Brisbane, QLD, Australia School of Pharmacy, The University of Queensland, Brisbane, QLD, Australia
| | - Steve Kisely
- Faculty of Medicine, The University of Queensland, Brisbane, QLD, Australia
| | - Emily Brooks
- Faculty of Medicine, The University of Queensland, Brisbane, QLD, Australia
| | - Dan Siskind
- Faculty of Medicine, The University of Queensland, Brisbane, QLD, Australia
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Peters E, Shamloo A, Lodhi RJ, Marcoux G, Jackson K, Halayka S, Balbuena L. Medication Gaps and Antipsychotic Polypharmacy in Previously Hospitalized Schizophrenia Patients: An Electronic Cohort Study in Three Canadian Provinces. Front Psychiatry 2022; 13:917361. [PMID: 35782434 PMCID: PMC9243750 DOI: 10.3389/fpsyt.2022.917361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 05/26/2022] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Real world evidence about antipsychotics focuses on rehospitalization. Modeling the time course of pharmacotherapy would show patients' adherence to medications and physicians' adherence to medication guidelines. We aimed to calculate the cumulative time spent in second generation antipsychotics (SGAs), gaps, antipsychotic polypharmacy, and clozapine in discharged schizophrenia patients. METHODS Hospitalization and pharmacy dispensing data from 2008-2018 in Manitoba, Saskatchewan, and British Columbia were linked and an electronic cohort (N = 2,997) was created (mean follow-up: 49 months, SD = 38). Cohort members were required to have a minimum of 6 weeks medicated with aripiprazole, olanzapine, paliperidone, quetiapine, risperidone, or ziprasidone. RESULTS The multistate model predicted that schizophrenia patients accumulated 44 months in SGA monotherapy, 4 months in polypharmacy, 11 months in medication gaps and 17 days in clozapine over a 5-year period. The majority of transitions were between SGA and medication gap. Accumulated time in medication gaps was seven times as much as in clozapine. Each 10% delay in SGA initiation post-discharge was associated with a 2, 1, and 6% higher risk for polypharmacy (95% CI: 1.01-1.02), gap (95% CI: 1.01-1.01), and clozapine (95% CI: 1.04-1.08), respectively. INTERPRETATION Schizophrenia patients accumulated more time unmedicated and in polypharmacy compared to clozapine. Either treatment guidelines for schizophrenia are not followed, or real-world challenges hamper their implementation.
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Affiliation(s)
- Evyn Peters
- Department of Psychiatry, University of Saskatchewan, Saskatoon, SK, Canada
| | - Arash Shamloo
- Department of Psychiatry, University of Saskatchewan, Saskatoon, SK, Canada
| | - Rohit J Lodhi
- Department of Psychiatry, University of Western Ontario, London, ON, Canada
| | - Gene Marcoux
- Department of Psychiatry, University of Saskatchewan, Saskatoon, SK, Canada
| | - Kylie Jackson
- Mental Health Outpatient Services, Saskatchewan Health Authority, Prince Albert, SK, Canada
| | | | - Lloyd Balbuena
- Department of Psychiatry, University of Saskatchewan, Saskatoon, SK, Canada
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Segev A, Iqbal E, McDonagh TA, Casetta C, Oloyede E, Piper S, Plymen CM, MacCabe JH. Clozapine-induced myocarditis: electronic health register analysis of incidence, timing, clinical markers and diagnostic accuracy. Br J Psychiatry 2021; 219:644-651. [PMID: 35048875 PMCID: PMC8636612 DOI: 10.1192/bjp.2021.58] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 04/07/2021] [Accepted: 04/13/2021] [Indexed: 01/08/2023]
Abstract
BACKGROUND Clozapine is associated with increased risk of myocarditis. However, many common side-effects of clozapine overlap with the clinical manifestations of myocarditis. As a result, there is uncertainty about which signs, symptoms and investigations are important in distinguishing myocarditis from benign adverse effects of clozapine. Clarity on this issue is important, since missing a diagnosis of myocarditis or discontinuing clozapine unnecessarily may both have devastating consequences. AIMS To examine the clinical characteristics of clozapine-induced myocarditis and to identify which signs and symptoms distinguish true myocarditis from other clozapine adverse effects. METHOD A retrospective analysis of the record database for 247 621 patients was performed. A natural language processing algorithm identified the instances of patients in which myocarditis was suspected. The anonymised case notes for the patients of each suspected instance were then manually examined, and those whose instances were ambiguous were referred for an independent assessment by up to three cardiologists. Patients with suspected instances were classified as having confirmed myocarditis, myocarditis ruled out or undetermined. RESULTS Of 254 instances in 228 patients with suspected myocarditis, 11.4% (n = 29 instances) were confirmed as probable myocarditis. Troponin and C-reactive protein (CRP) had excellent diagnostic value (area under the curve 0.975 and 0.896, respectively), whereas tachycardia was of little diagnostic value. All confirmed instances occurred within 42 days of clozapine initiation. CONCLUSIONS Suspicion of myocarditis can lead to unnecessary discontinuation of clozapine. The 'critical period' for myocarditis emergence is the first 6 weeks, and clinical signs including tachycardia are of low specificity. Elevated CRP and troponin are the best markers for the need for further evaluation.
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Affiliation(s)
- Aviv Segev
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK; Shalvata Mental Health Centre, Israel; and Sackler Faculty of Medicine, Tel Aviv University, Israel
| | - Ehtesham Iqbal
- The Department of Biostatistics and Health Informatics, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK
| | - Theresa A. McDonagh
- Cardiology Department, King's College Hospital and King's College London, UK
| | - Cecilia Casetta
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK; and National Psychosis Service, South London and Maudsley NHS Foundation Trust, UK
| | - Ebenezer Oloyede
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK; and Pharmacy Department, South London and Maudsley NHS Foundation Trust, UK
| | - Susan Piper
- Cardiology Department, King's College Hospital and King's College London, UK
| | - Carla M. Plymen
- Cardiology Department, Hammersmith Hospital, Imperial College Healthcare NHS Trust, UK
| | - James H. MacCabe
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK; and National Psychosis Service, South London and Maudsley NHS Foundation Trust, UK
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Sharma S, Kopelovich SL, Janjua AU, Pritchett C, Broussard B, Dhir M, Wilson JG, Goldsmith DR, Cotes RO. Cluster Analysis of Clozapine Consumer Perspectives and Comparison to Consumers on Other Antipsychotics. SCHIZOPHRENIA BULLETIN OPEN 2021; 2:sgab043. [PMID: 34676369 PMCID: PMC8521287 DOI: 10.1093/schizbullopen/sgab043] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Despite its unique efficacy, clozapine remains underutilized in the United States. Perceptions about clozapine and barriers to its use have been examined among prescribers, but insufficiently studied among consumers. We surveyed 211 antipsychotic consumers (86 on clozapine and 125 on other antipsychotics) on their medication-related perspectives in a public hospital system in Atlanta, Georgia, USA. In contrast to their previous regimen, 72% of clozapine consumers reported they were more satisfied with clozapine. When compared with consumers taking other antipsychotics, clozapine consumers reported more side effects but did not differ on other measures of satisfaction or efficacy. We found Caucasians to be overrepresented among clozapine, as compared to other antipsychotic consumers. Side effects most strongly associated with poor safety ratings were sedation, limb jerking, and dizziness when standing. However, clozapine was only rated less safe by consumers who experienced more than one of these side effects. We used an unsupervised clustering approach to identify three major groups of clozapine consumers. Cluster A (19%) had the lowest safety ratings, aversion to blood work, and a high rate of side effects that associate with lower safety ratings. Cluster B (25%) experienced more hospitalizations and reported satisfaction with clozapine that correlated with efficacy ratings, irrespective of safety ratings. Cluster C (56%) experienced fewer hospitalizations, fewer previous drug trials, greater educational attainment, lower rates of smoking, and rated clozapine more highly. This work identifies common side effects that influence the subjective safety of clozapine and suggests that attitudes toward clozapine depend on context-specific factors.
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Affiliation(s)
- Sumeet Sharma
- Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine, Atlanta, GA, USA
| | - Sarah L Kopelovich
- Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine, Atlanta, GA, USA
| | - A Umair Janjua
- Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine, Atlanta, GA, USA
| | - Cristina Pritchett
- Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine, Atlanta, GA, USA
| | - Beth Broussard
- Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine, Atlanta, GA, USA
| | - Meena Dhir
- Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine, Atlanta, GA, USA
| | - Joseph G Wilson
- Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine, Atlanta, GA, USA
| | - David R Goldsmith
- Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine, Atlanta, GA, USA
| | - Robert O Cotes
- Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine, Atlanta, GA, USA
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Blackman G, Oloyede E, Horowitz M, Harland R, Taylor D, MacCabe J, McGuire P. Reducing the Risk of Withdrawal Symptoms and Relapse Following Clozapine Discontinuation-Is It Feasible to Develop Evidence-Based Guidelines? Schizophr Bull 2021; 48:176-189. [PMID: 34651184 PMCID: PMC8781383 DOI: 10.1093/schbul/sbab103] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Clozapine is the only antipsychotic that is effective in treatment-resistant schizophrenia. However, in certain clinical situations, such as the emergence of serious adverse effects, it is necessary to discontinue clozapine. Stopping clozapine treatment poses a particular challenge due to the risk of psychotic relapse, as well as the development of withdrawal symptoms. Despite these challenges for the clinician, there is currently no formal guidance on how to safely to discontinue clozapine. We assessed the feasibility of developing evidence-based recommendations for (1) minimizing the risk of withdrawal symptoms, (2) managing withdrawal phenomena, and (3) commencing alternatives treatment when clozapine is discontinued. We then evaluated the recommendations against the Appraisal of Guidelines for Research and Evaluation (AGREE) II criteria. We produced 19 recommendations. The majority of these recommendation were evidence-based, although the strength of some recommendations was limited by a reliance of studies of medium to low quality. We discuss next steps in the refinement and validation of an evidence-based guideline for stopping clozapine and identify key outstanding questions.
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Affiliation(s)
- Graham Blackman
- Department of Psychosis Studies, Institute of Psychiatry, Psychology & Neuroscience, King’s College London, London, UK,Psychosis Clinical Academic Group, South London and Maudsley NHS Foundation Trust, London, UK,To whom correspondence should be addressed; Department of Psychosis Studies, Institute of Psychiatry, Psychology & Neuroscience, King’s College London, London, UK; tel: 44-20-7848-5228, fax: 44-20-7848-0976, e-mail:
| | - Ebenezer Oloyede
- Department of Psychosis Studies, Institute of Psychiatry, Psychology & Neuroscience, King’s College London, London, UK,Psychosis Clinical Academic Group, South London and Maudsley NHS Foundation Trust, London, UK,Institute of Pharmaceutical Science, King’s College London, London, UK
| | - Mark Horowitz
- Division of Psychiatry, University College London, London, UK,North East London NHS Foundation Trust, London, UK
| | - Robert Harland
- Department of Psychosis Studies, Institute of Psychiatry, Psychology & Neuroscience, King’s College London, London, UK,Psychosis Clinical Academic Group, South London and Maudsley NHS Foundation Trust, London, UK
| | - David Taylor
- Institute of Pharmaceutical Science, King’s College London, London, UK
| | - James MacCabe
- Department of Psychosis Studies, Institute of Psychiatry, Psychology & Neuroscience, King’s College London, London, UK,Psychosis Clinical Academic Group, South London and Maudsley NHS Foundation Trust, London, UK
| | - Philip McGuire
- Department of Psychosis Studies, Institute of Psychiatry, Psychology & Neuroscience, King’s College London, London, UK,Psychosis Clinical Academic Group, South London and Maudsley NHS Foundation Trust, London, UK
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Pardiñas AF, Owen MJ, Walters JTR. Pharmacogenomics: A road ahead for precision medicine in psychiatry. Neuron 2021; 109:3914-3929. [PMID: 34619094 DOI: 10.1016/j.neuron.2021.09.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 08/05/2021] [Accepted: 09/09/2021] [Indexed: 12/11/2022]
Abstract
Psychiatric genomics is providing insights into the nature of psychiatric conditions that in time should identify new drug targets and improve patient care. Less attention has been paid to psychiatric pharmacogenomics research, despite its potential to deliver more rapid change in clinical practice and patient outcomes. The pharmacogenomics of treatment response encapsulates both pharmacokinetic ("what the body does to a drug") and pharmacodynamic ("what the drug does to the body") effects. Despite early optimism and substantial research in both these areas, they have to date made little impact on clinical management in psychiatry. A number of bottlenecks have hampered progress, including a lack of large-scale replication studies, inconsistencies in defining valid treatment outcomes across experiments, a failure to routinely incorporate adverse drug reactions and serum metabolite monitoring in study designs, and inadequate investment in the longitudinal data collections required to demonstrate clinical utility. Nonetheless, advances in genomics and health informatics present distinct opportunities for psychiatric pharmacogenomics to enter a new and productive phase of research discovery and translation.
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Affiliation(s)
- Antonio F Pardiñas
- MRC Centre for Neuropsychiatric Genetics and Genomics, Cardiff University School of Medicine, Hadyn Ellis Building, Maindy Road, Cardiff CF24 4HQ, UK
| | - Michael J Owen
- MRC Centre for Neuropsychiatric Genetics and Genomics, Cardiff University School of Medicine, Hadyn Ellis Building, Maindy Road, Cardiff CF24 4HQ, UK.
| | - James T R Walters
- MRC Centre for Neuropsychiatric Genetics and Genomics, Cardiff University School of Medicine, Hadyn Ellis Building, Maindy Road, Cardiff CF24 4HQ, UK
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The Effect of Clozapine on Self-reported Duration of Sleep and Its Interaction With 23 Other Medications: A 5-Year Naturalistic Study. J Clin Psychopharmacol 2021; 41:534-539. [PMID: 34519455 DOI: 10.1097/jcp.0000000000001432] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Sedation is a common and incapacitating clozapine adverse effect, but the factors associated with sedation and its pharmacological management remain poorly studied. METHODS We conducted a retrospective cohort study based on deidentified electronic clinical records of clozapine-treated patients from the secondary mental health care provider for Cambridgeshire and Peterborough, United Kingdom. We first evaluated cross-sectionally the influence of clozapine dose, clozapine, and norclozapine plasma levels on self-reported hours slept, as a proxy for sedation, using bivariate correlation and then the longitudinal effect of changes in clozapine dose and other 23 medications using linear mixed effect models. We followed 241 clozapine-treated patients for 56 months on average, with 2237 face-to-face assessments in total. RESULTS Patients slept for a mean of 9.35 h/d, with 46% reporting 10 h/d or more. Cross-sectionally, sleep duration did not correlate with clozapine dose (r = 0.14, P = 0.106), but with clozapine plasma levels (r = 0.38, P < 0.0001) and norclozapine plasma levels (r = 0.25, P = 0.005). Longitudinally, the final mixed-effects model revealed 4 pharmacological variables that had a significant impact on hours slept: clozapine, risperidone augmentation, and atenolol were associated with increased sleep, whereas aripiprazole augmentation was associated with decreased sleep. We found that 20 other psychotropic medications measured were not associated with changes in sleep when added to clozapine. Excess sleep is a clozapine level-dependent adverse effect. CONCLUSIONS The impact of different augmentation strategies might help clinicians decide on the most adequate strategy, albeit further studies should confirm our results.
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Chakrabarti S. Clozapine resistant schizophrenia: Newer avenues of management. World J Psychiatry 2021; 11:429-448. [PMID: 34513606 PMCID: PMC8394694 DOI: 10.5498/wjp.v11.i8.429] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 04/12/2021] [Accepted: 07/13/2021] [Indexed: 02/06/2023] Open
Abstract
About 40%-70% of the patients with treatment-resistant schizophrenia have a poor response to adequate treatment with clozapine. The impact of clozapine-resistant schizophrenia (CRS) is even greater than that of treatment resistance in terms of severe and persistent symptoms, relapses and hospitalizations, poorer quality of life, and healthcare costs. Such serious consequences often compel clinicians to try different augmentation strategies to enhance the inadequate clozapine response in CRS. Unfortunately, a large body of evidence has shown that antipsychotics, antidepressants, mood stabilizers, electroconvulsive therapy, and cognitive-behavioural therapy are mostly ineffective in augmenting clozapine response. When beneficial effects of augmentation have been found, they are usually small and of doubtful clinical significance or based on low-quality evidence. Therefore, newer treatment approaches that go beyond the evidence are needed. The options proposed include developing a clinical consensus about the augmentation strategies that are most likely to be effective and using them sequentially in patients with CRS. Secondly, newer approaches such as augmentation with long-acting antipsychotic injections or multi-component psychosocial interventions could be considered. Lastly, perhaps the most effective way to deal with CRS would be to optimize clozapine treatment, which might prevent clozapine resistance from developing. Personalized dosing, adequate treatment durations, management of side effects and non-adherence, collaboration with patients and caregivers, and addressing clinician barriers to clozapine use are the principal ways of ensuring optimal clozapine treatment. At present, these three options could the best way to manage CRS until research provides more firm directions about the effective options for augmenting clozapine response.
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Affiliation(s)
- Subho Chakrabarti
- Department of Psychiatry, Postgraduate Institute of Medical Education and Research, Chandigarh 160012, India
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Oloyede E, Casetta C, Dzahini O, Segev A, Gaughran F, Shergill S, Mijovic A, Helthuis M, Whiskey E, MacCabe JH, Taylor D. There Is Life After the UK Clozapine Central Non-Rechallenge Database. Schizophr Bull 2021; 47:1088-1098. [PMID: 33543755 PMCID: PMC8266568 DOI: 10.1093/schbul/sbab006] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
BACKGROUND AND AIMS In the United Kingdom, patients on clozapine whose hematological parameters fall below certain thresholds are placed on the Central Non-Rechallenge Database (CNRD), meaning that they cannot be prescribed clozapine again except under exceptional circumstances. This practice was discontinued in the United States in 2015 by expanding the hematological monitoring guidelines, allowing more patients to receive clozapine. Our objective was to investigate the implications this policy change would have on clozapine utilization in the United Kingdom. METHODS This was an observational, retrospective analysis of patients registered on the CNRD in a large mental health trust. The first objective was to compare the number of patients placed on the CNRD under the United Kingdom and the US Food and Drug Administration (FDA) criteria. The second objective was to explore the hematological and clinical outcomes of CNRD patients. The third objective was to investigate the hematological outcomes of patients rechallenged on clozapine after nonrechallengeable status. RESULTS One hundred and fifteen patients were placed on CNRD from 2002 to 2019, of whom 7 (6%) met the equivalent criteria for clozapine discontinuation under the FDA guidelines. Clinical outcomes, as measured by the Clinical Global Impression-Severity scale, were worse 3 months after clozapine cessation than on clozapine (t = -7.4862; P < .001). Sixty-two (54%) patients placed on CNRD were rechallenged. Fifty-nine of those (95%) were successfully rechallenged; 3 patients were placed back on CNRD, only one of which would have had to stop clozapine again under FDA criteria. CONCLUSION Implementation of the updated FDA's monitoring criteria in the United Kingdom would significantly reduce clozapine discontinuation due to hematological reasons. The evidence suggests an urgent need for revising the UK clozapine monitoring guidelines to improve outcomes in treatment-resistant schizophrenia.
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Affiliation(s)
- Ebenezer Oloyede
- Pharmacy Department, South London and Maudsley NHS Foundation Trust, London, UK
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| | - Cecilia Casetta
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
- National Psychosis Service, South London and Maudsley NHS Foundation Trust, London, UK
| | - Olubanke Dzahini
- Pharmacy Department, South London and Maudsley NHS Foundation Trust, London, UK
- Institute of Pharmaceutical Science, King’s College, London, UK
| | - Aviv Segev
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Fiona Gaughran
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
- National Psychosis Service, South London and Maudsley NHS Foundation Trust, London, UK
| | - Sukhi Shergill
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
- National Psychosis Service, South London and Maudsley NHS Foundation Trust, London, UK
| | - Alek Mijovic
- Kings College Hospital NHS Foundation Trust, London, UK
| | | | - Eromona Whiskey
- Pharmacy Department, South London and Maudsley NHS Foundation Trust, London, UK
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
- National Psychosis Service, South London and Maudsley NHS Foundation Trust, London, UK
- NIHR Biomedical Research Centre for Mental Health South London and Maudsley NHS, London, UK
| | - James Hunter MacCabe
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
- National Psychosis Service, South London and Maudsley NHS Foundation Trust, London, UK
- NIHR Biomedical Research Centre for Mental Health South London and Maudsley NHS, London, UK
| | - David Taylor
- Pharmacy Department, South London and Maudsley NHS Foundation Trust, London, UK
- Institute of Pharmaceutical Science, King’s College, London, UK
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46
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Augmentation of Antipsychotic Medications with Low-Dose Clozapine in Treatment-Resistant Schizophrenia-Case Reports and Discussion. Case Rep Psychiatry 2021; 2021:5525398. [PMID: 34239749 PMCID: PMC8235956 DOI: 10.1155/2021/5525398] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 05/05/2021] [Accepted: 06/04/2021] [Indexed: 11/18/2022] Open
Abstract
Treatment resistance in schizophrenia is often encountered in clinical practice, with clozapine usually recommended as the appropriate therapy. However, where clozapine proves ineffective or cannot be tolerated due to side effects, treatment options are limited. In patients within forensic mental health services, residual symptomatology often presents a barrier to discharge and can have lasting effects on prospects for rehabilitation as well as risk to self and others. This paper presents a review of the relevant literature and three cases of a novel approach, utilising clozapine in doses usually considered subtherapeutic, in combination with the primary antipsychotic treatment. In all three patients, it improved clinical efficacy as well as tolerability, resulting in improvement that allowed discharge from the forensic hospital.
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47
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Laforgue EJ, Istvan M, Guerlais M, Chaslerie A, Artarit P, Vallot G, Jolliet P, Grall-Bronnec M, Victorri-Vigneau C. What about regular hematological monitoring during clozapine treatment? A compliance analysis using the French health insurance database. Expert Opin Drug Saf 2021; 20:1247-1256. [PMID: 34085879 DOI: 10.1080/14740338.2021.1939304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
BACKGROUND The inherent risk of agranulocytosis associated with clozapine requires the realization of weekly white blood cell monitoring (WBCM) during the 18 first weeks of treatment. The aim of this study was to assess the compliance with WBCM during clozapine initiation for schizophrenia and Parkinson's disease (PD) subjects. RESEARCH DESIGN AND METHOD The analysis was conducted using SNDS data on a cohort of new users of clozapine in 2018. We analyzed all reimbursements for WBCM from 2 weeks before the index date to 18 weeks after (optimal monitoring during hospitalization was assumed). The primary outcome was the proportion of good realization of WBCM according to different thresholds of completion (70%; 80%; 90%). Descriptive and comparative analyses with chi-squared test or Student's t-test were performed. RESULTS Two hundred and ninety-six subjects were included. Rates of patients with WBCM realization over 70%, 80%, and 90% of WBCM expected were, respectively, 78.1%, 70.0%, and 56.9% for subjects with schizophrenia and 71.3%, 63.2%, and 47.8% for PD subjects. Only hospitalization during the follow-up period for schizophrenia subjects was significantly associated with good WBCM realization. CONCLUSIONS We observed rather good results for compliance with clozapine initial monitoring. Other studies are needed to confirm our results.
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Affiliation(s)
- Edouard-Jules Laforgue
- Clinical Pharmacology Department, Nantes University Hospital, Nantes, France.,INSERM UMR 1246 SPHERE (Methods in Patients-centered Outcomes and HEalth Research), Nantes and Tours Universities, France
| | - Marion Istvan
- Clinical Pharmacology Department, Nantes University Hospital, Nantes, France.,INSERM UMR 1246 SPHERE (Methods in Patients-centered Outcomes and HEalth Research), Nantes and Tours Universities, France
| | - Marylène Guerlais
- Clinical Pharmacology Department, Nantes University Hospital, Nantes, France
| | - Anicet Chaslerie
- Medical Department, French Health Insurance System, Nantes, France
| | - Pascal Artarit
- Medical Department, French Health Insurance System, Nantes, France
| | - Genevieve Vallot
- Medical Department, French Health Insurance System, Nantes, France
| | - Pascale Jolliet
- Clinical Pharmacology Department, Nantes University Hospital, Nantes, France.,INSERM UMR 1246 SPHERE (Methods in Patients-centered Outcomes and HEalth Research), Nantes and Tours Universities, France
| | - Marie Grall-Bronnec
- INSERM UMR 1246 SPHERE (Methods in Patients-centered Outcomes and HEalth Research), Nantes and Tours Universities, France.,Addictology and Liaison-Psychiatry Department, Nantes University Hospital, Nantes, France
| | - Caroline Victorri-Vigneau
- Clinical Pharmacology Department, Nantes University Hospital, Nantes, France.,INSERM UMR 1246 SPHERE (Methods in Patients-centered Outcomes and HEalth Research), Nantes and Tours Universities, France
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48
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Wellesley Wesley E, Patel I, Kadra-Scalzo G, Pritchard M, Shetty H, Broadbent M, Segev A, Patel R, Downs J, MacCabe JH, Hayes RD, de Freitas DF. Gender disparities in clozapine prescription in a cohort of treatment-resistant schizophrenia in the South London and Maudsley case register. Schizophr Res 2021; 232:68-76. [PMID: 34022618 DOI: 10.1016/j.schres.2021.05.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 04/29/2021] [Accepted: 05/01/2021] [Indexed: 11/30/2022]
Abstract
BACKGROUND Gender disparities in treatment are apparent across many areas of healthcare. There has been little research into whether clozapine prescription, the first-line treatment for treatment-resistant schizophrenia (TRS), is affected by patient gender. METHODS This retrospective cohort study identified 2244 patients with TRS within the South London and Maudsley NHS Trust, by using a bespoke method validated against a gold-standard, manually coded, dataset of TRS cases. The outcome and exposures were identified from the free-text using natural language processing applications (including machine learning and rules-based approaches) and from information entered in structured fields. Multivariable logistic regression was carried out to calculate the odds ratios for clozapine prescription according to patients' gender, and adjusting for numerous potential confounders including sociodemographic, clinical (e.g., psychiatric comorbidities and substance use), neutropenia, functional factors (e.g., problems with occupation), and clinical monitoring. RESULTS Clozapine was prescribed to 77% of the women and 85% of the men with TRS. Women had reduced odds of being prescribed clozapine as compared to men after adjusting for all factors included in the present study (adjusted OR: 0.66; 95% CI 0.44-0.97; p = 0.037). CONCLUSION Women with TRS are less likely to be prescribed clozapine than men with TRS, even when considering the effects of multiple clinical and functional factors. This finding suggests there could be gender bias in clozapine prescription, which carries ramifications for the relatively poorer care of women with TRS regarding many outcomes such as increased hospitalisation, mortality, and poorer quality of life.
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Affiliation(s)
- Emma Wellesley Wesley
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - India Patel
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | | | - Megan Pritchard
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK; South London and Maudsley NHS Foundation Trust, London, UK
| | - Hitesh Shetty
- South London and Maudsley NHS Foundation Trust, London, UK
| | | | - Aviv Segev
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Shalvata Mental Health Center, Hod Hasharon, Israel
| | - Rashmi Patel
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK; South London and Maudsley NHS Foundation Trust, London, UK
| | - Johnny Downs
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK; South London and Maudsley NHS Foundation Trust, London, UK
| | - James H MacCabe
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK; South London and Maudsley NHS Foundation Trust, London, UK
| | - Richard D Hayes
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
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Willcocks IR, Legge SE, Nalmpanti M, Mazzeo L, King A, Jansen J, Helthuis M, Owen MJ, O’Donovan MC, Walters JTR, Pardiñas AF. Clozapine Metabolism is Associated With Absolute Neutrophil Count in Individuals With Treatment-Resistant Schizophrenia. Front Pharmacol 2021; 12:658734. [PMID: 33959025 PMCID: PMC8094024 DOI: 10.3389/fphar.2021.658734] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 03/17/2021] [Indexed: 11/13/2022] Open
Abstract
Up to one-third of those with schizophrenia fail to respond to standard antipsychotics and are considered to have treatment-resistant schizophrenia, a condition for which clozapine is the only evidence-based medication. While up to 60% of treated individuals obtain therapeutic benefits from clozapine, it is currently underprescribed worldwide, partly because of concerns related to its broad adverse effect profile. In particular, the potential effects of clozapine on the immune system have gained relevance after a recent study showed that drug plasma concentrations were inversely correlated with neutrophil counts in individuals routinely undergoing treatment. Seeking to investigate this relationship in more detail, we extracted metabolic, immune, and genetic data from a UK cohort of long-term clozapine users linked to a clozapine monitoring service, CLOZUK2 (N = 208). Whilst a correlation analysis was compatible with the original results, a multiple linear regression accounting for dose and other confounding factors additionally allowed us to estimate the decrease in absolute neutrophil counts to approximately 141 cells/mm3 for every 0.1 mg/L increase in clozapine concentration. However, this association was attenuated after controlling for the metabolic ratio between clozapine and its main metabolite, norclozapine, which was itself negatively associated with neutrophil concentrations. Further analyses revealed that these relationships are likely moderated by genetic factors, as three pharmacogenomic SNPs previously associated to norclozapine plasma concentrations and the metabolic ratio (rs61750900, rs2011425 and rs1126545) were shown to be independently associated with a variation in neutrophil counts of about 400 cells/mm3 per effect allele. Such results are compatible with an effect of norclozapine, but not necessarily clozapine, on immune cell counts, and highlight the need for further investigations into the potential role of genetic determinants of clozapine pharmacokinetics in the occurrence of adverse effects during treatment.
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Affiliation(s)
- Isabella R. Willcocks
- MRC Centre for Neuropsychiatric Genetics and Genomics, Division of Psychological Medicine and Clinical Neurosciences, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Sophie E. Legge
- MRC Centre for Neuropsychiatric Genetics and Genomics, Division of Psychological Medicine and Clinical Neurosciences, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Mariana Nalmpanti
- MRC Centre for Neuropsychiatric Genetics and Genomics, Division of Psychological Medicine and Clinical Neurosciences, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Lucy Mazzeo
- Hafan y Coed Mental Health Unit, University Hospital of Llandough, Cardiff, United Kingdom
| | - Adrian King
- Magna Laboratories Ltd., Ross-on-Wye, United Kingdom
| | | | | | - Michael J. Owen
- MRC Centre for Neuropsychiatric Genetics and Genomics, Division of Psychological Medicine and Clinical Neurosciences, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Michael C. O’Donovan
- MRC Centre for Neuropsychiatric Genetics and Genomics, Division of Psychological Medicine and Clinical Neurosciences, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - James T. R. Walters
- MRC Centre for Neuropsychiatric Genetics and Genomics, Division of Psychological Medicine and Clinical Neurosciences, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Antonio F. Pardiñas
- MRC Centre for Neuropsychiatric Genetics and Genomics, Division of Psychological Medicine and Clinical Neurosciences, School of Medicine, Cardiff University, Cardiff, United Kingdom
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50
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Yada Y, Kitagawa K, Sakamoto S, Ozawa A, Nakada A, Kashiwagi H, Okahisa Y, Takao S, Takaki M, Kishi Y, Yamada N. The relationship between plasma clozapine concentration and clinical outcome: a cross-sectional study. Acta Psychiatr Scand 2021; 143:227-237. [PMID: 33274435 DOI: 10.1111/acps.13264] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Revised: 11/24/2020] [Accepted: 11/29/2020] [Indexed: 12/14/2022]
Abstract
OBJECTIVE There is no report that statistically evaluates the therapeutic reference (350-600 ng/ml) and adverse drug reaction (ADR) range (>1000 ng/ml) of clozapine (CLZ) recommended by the Arbeitsgemeinschaft für Neuropsychopharmakologie und Pharmakopsychiatrie (AGNP) consensus guidelines in an isolated and large sampling study. METHODS We administered CLZ to 131 Japanese patients with treatment-resistant schizophrenia in a multicenter cross-sectional study. Plasma CLZ concentrations were assayed by high-performance liquid chromatography using trough sampling. The Brief Psychiatric Rating Scale (BPRS) and severe dose-dependent ADR (sedation, myoclonus, and seizures) were analyzed statistically after adjusting for possible confounders. RESULTS The daily CLZ dosage showed a moderately positive relationship with the plasma concentration (r = 0.49, p < 0.001). Every 100 ng/ml increase in plasma CLZ concentration improved the total BPRS score 1.95% (95% CI: 0.89-3.01, p < 0.001) and the odds ratio (OR) 1.38 (95% CI: 1.14-1.66, p = 0.001) for BPRS response. Compared with concentrations below 350 ng/ml CLZ, 350-600 ng/ml (11.12%; 95% CI: 2.52-19.72, p = 0.012) and 600-1000 ng/ml (11.05%; 95% CI: 2.40-19.71, p = 0.013) showed significant improvement in the total BPRS score. Dosages above 1000 ng/ml showed greater improvement (25.36%; 95% CI: 13.08-37.64, p < 0.001) of the total BPRS score but more severe ADRs than dosages below 1000 ng/ml (OR: 31.72; 95% CI: 1.04-968.81, p = 0.048). CONCLUSION The AGNP therapeutic reference range (350-600 ng/ml) is useful, and a dose above 1000 ng/ml is potentially more effective but carries the risk of severe ADRs in the central nervous system.
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Affiliation(s)
- Yuji Yada
- Department of Neuropsychiatry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan.,Okayama Psychiatric Medical Center, Okayama, Japan
| | | | - Shinji Sakamoto
- Department of Neuropsychiatry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | | | | | - Hiroko Kashiwagi
- Department of Forensic Psychiatry, National Center Hospital, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Yuko Okahisa
- Department of Neuropsychiatry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Soshi Takao
- Department of Epidemiology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Manabu Takaki
- Department of Neuropsychiatry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | | | - Norihito Yamada
- Department of Neuropsychiatry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
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