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Naltrexone Implant for Opioid Use Disorder. Neurol Int 2021; 14:49-61. [PMID: 35076607 PMCID: PMC8788412 DOI: 10.3390/neurolint14010004] [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: 11/22/2021] [Revised: 12/23/2021] [Accepted: 12/27/2021] [Indexed: 01/24/2023] Open
Abstract
The continued rise in the availability of illicit opioids and opioid-related deaths in the United States has left physicians, researchers, and lawmakers desperate for solutions to this ongoing epidemic. The research into therapeutic options for the treatment of opioid use disorder (OUD) began with the introduction of methadone in the 1960s. The approval of oral naltrexone initially showed much promise, as the drug was observed to be highly potent in antagonizing the effects of opioids while producing no opioid agonist effects of its own and having a favorable side effect profile. Patients that routinely take their naltrexone reported fewer days of heroin use and had more negative drug tests than those without treatment. Poor outcomes in OUD patients treated with naltrexone have been directly tied to short treatment time. Studies have shown that naltrexone given orally vs. as an implant at the 6-month interval showed a higher non-compliance rate among those who used oral medications at the 6-month mark and a slower return to use rate. There were concerns that naltrexone could possibly worsen negative symptoms seen in opiate use disorder related to blockade of endogenous opioids that are important for pleasurable stimuli. Studies have shown that naltrexone demonstrated no increase in levels of anxiety, depression and anhedonia in participants and another study found that those treated with naltrexone had a significant reduction in mental health-related hospitalizations. The latter study also concluded that there was no increased risk for mental health-related incidents in patients taking naltrexone via a long-acting implant. Although not yet FDA approved in the United States, naltrexone implant has shown promising results in Europe and Australia and may provide a novel treatment option for opioid addiction.
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Erk MA, Firat S. Types of Medication-Assisted Treatment for Opioid Use Disorder in Turkey: The Perceptions of Inpatients about Treatment Success. Psychiatry Investig 2020; 17:1182-1190. [PMID: 33301668 PMCID: PMC8560342 DOI: 10.30773/pi.2020.0307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 09/22/2020] [Indexed: 11/27/2022] Open
Abstract
OBJECTIVE The aim of this study was the following. When the different dynamics of agonist or antagonist treatments considered it is assumed that the eligible treatment to the individual may be maintained with high efficacy. Thus, we aimed to examine the difference between treatment methods, considering sociodemographics and positive perception for treatment success. METHODS The number of 136 individuals which their ages range between 19-50 and have been getting agonist (buprenorphine/naloxone) or antagonist (naltrexone) treatment because of opioid use disorder while resting in clinics have been evaluated to reveal the factors that may alter their perception about treatment and have been compared with sociodemographic variables and characteristics such as sociotropic and autonomic. Therefore, "Sociodemographic Data Evaluation Form," "Predictive Factors for The Addiction Treatment Success Scale," and "Sociotropy-Autonomy Scale" were used to assess the sociodemographic data, the perception towards factors which have been affected to the treatment and characteristics. The data of the individuals have been collected by the researcher via face-to-face interviews while patients were residential in the clinic. RESULTS According to results of our study, it has been detected that there are some differences in the perception of treatment success between individuals who have been getting agonist or antagonist treatments such as treatment method (p<0.05), treatment frequency (p<0.01) and parents' vital statuses (p<0.05). CONCLUSION At the end of the study it has been understood that medical and social benefits after the selection of eligible treatment methods which is suitable for individual's perception and characteristics have to be considered.
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Affiliation(s)
- Mehmet Aykut Erk
- Çukurova University, Addiction and Forensic Sciences Institue, Adana, Turkey
| | - Sunay Firat
- Çukurova University, Addiction and Forensic Sciences Institue, Adana, Turkey
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Kelty E, Hulse G, Joyce D, Preen DB. Impact of Pharmacological Treatments for Opioid Use Disorder on Mortality. CNS Drugs 2020; 34:629-642. [PMID: 32215842 DOI: 10.1007/s40263-020-00719-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The use of pharmacological treatments for opioid use disorders, including methadone, buprenorphine and naltrexone has been associated with a reduction in mortality compared with illicit opioid use. However, these treatments can also contribute significantly to the risk of death. The opioid agonists methadone and buprenorphine achieve clinical efficacy in patients with an opioid use disorder through suppressing craving and diminishing the effectiveness of illicit opioid doses, while the antagonist naltrexone blocks the action of opioids. Pharmacological differences between opioid pharmacotherapies then create different temporal patterns of protection and mortality risk, different risks of relapse to illicit opioid use, and variations in direct and indirect toxicity, which are revealed in clinical and epidemiological studies. Induction onto methadone and the cessation of oral naltrexone treatment are associated with an elevated risk of opioid poisoning, which is not apparent in patients treated with buprenorphine or sustained-release naltrexone. Beyond drug-related mortality, these pharmacotherapies can impact a participant's risk of death. Buprenorphine may also have some advantages over methadone in patients with depressive disorders or cardiovascular abnormalities. Naltrexone, which is also commonly prescribed to manage problem alcohol use, may reduce deaths in chronic co-alcohol users. Understanding these pharmacologically driven patterns then guides the judicious choice of drug and dosing schedule and the proactive risk management that is crucial to minimising the risk of death in treatment.
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Affiliation(s)
- Erin Kelty
- School of Population and Global Health, The University of Western Australia, 35 Stirling Highway, Crawley, Perth, WA, 6009, Australia.
| | - Gary Hulse
- Division of Psychiatry, Medical School, The University of Western Australia, Perth, WA, Australia.,Medical and Health Sciences, Edith Cowan University, Perth, WA, Australia
| | - David Joyce
- School of Biomedical Sciences, The University of Western Australia, Perth, WA, Australia
| | - David B Preen
- School of Population and Global Health, The University of Western Australia, 35 Stirling Highway, Crawley, Perth, WA, 6009, Australia
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Kelty E, Hulse G, Joyce D. A comparison of blood toxicology in fatalities involving alcohol and other drugs in patients with an opioid use disorder treated with methadone, buprenorphine, and implant naltrexone. THE AMERICAN JOURNAL OF DRUG AND ALCOHOL ABUSE 2019; 46:241-250. [DOI: 10.1080/00952990.2019.1698587] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Erin Kelty
- School of Population and Global Health, University of Western Australia, Crawley, Western Australia
| | - Gary Hulse
- Division of Psychiatry, University of Western Australia, Crawley, Western Australia
- School of Medical and Health Sciences, Edith Cowan University, Joondalup, Western Australia
| | - David Joyce
- School of Medicine, University of Western Australia, Crawley, Western Australia
- School of Biomedical Sciences, University of Western Australia, Crawley, Western Australia
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Darke S, Farrell M, Duflou J, Larance B, Lappin J. Circumstances of death of opioid users being treated with naltrexone. Addiction 2019; 114:2000-2007. [PMID: 31278812 DOI: 10.1111/add.14729] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 04/16/2019] [Accepted: 07/01/2019] [Indexed: 12/01/2022]
Abstract
BACKGROUND AND AIMS Naltrexone is an opioid antagonist used as a maintenance drug for the treatment of opioid dependence and in opioid withdrawal regimens. The current study aimed to: (1) determine the clinical characteristics and circumstances of death of people undergoing naltrexone treatment for opioid dependence; and (2) determine the blood toxicology of cases including naltrexone concentrations, the presence of other drugs and a comparison of morphine concentrations in the presence and absence of naltrexone. DESIGN Retrospective study of all deaths among people undergoing naltrexone treatment for opioid dependence retrieved from the National Coronial Information System, 2000-17. SETTING Australia-wide. CASES Seventy-four cases, with a mean age of 32.5 years; 81.1% male. MEASUREMENTS Information was collected on demographics, manner of death, naltrexone treatment history, toxicology and major organ pathology. FINDINGS Death was attributed to opioid toxicity in 86.5% of cases: accidental (79.7%), deliberate (6.8%). In 55.4% of all cases the decedent was maintained on oral naltrexone and 32.4% had a recent naltrexone implant. In five cases the decedent was undergoing opioid detoxification. Among those screened for naltrexone, naltrexone was present in the blood or urine of 52.5% (15.8% of oral maintenance cases, 85.7% of implant cases). Fourteen cases were known to have died from opioid toxicity with naltrexone present in their blood or urine. The median blood naltrexone concentrations were within the reported therapeutic range. CONCLUSIONS The primary cause of death among people undergoing naltrexone treatment for opioid dependence in Australia from 2000 to 2017 was opioid toxicity, the majority of cases having been maintained on oral naltrexone. Cases in which naltrexone was not detected indicate the importance of treatment compliance. Deaths due to opioid toxicity where naltrexone was present indicates the possibility of overdose while naltrexone medication is maintained.
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Affiliation(s)
- Shane Darke
- National Drug and Alcohol Research Centre, University of New South Wales, NSW, Australia
| | - Michael Farrell
- National Drug and Alcohol Research Centre, University of New South Wales, NSW, Australia
| | - Johan Duflou
- National Drug and Alcohol Research Centre, University of New South Wales, NSW, Australia.,Sydney Medical School, University of Sydney, NSW, Australia
| | - Briony Larance
- National Drug and Alcohol Research Centre, University of New South Wales, NSW, Australia.,School of Psychology, University of Wollongong, NSW, Australia
| | - Julia Lappin
- National Drug and Alcohol Research Centre, University of New South Wales, NSW, Australia.,School of Psychiatry, University of New South Wales, NSW, Australia
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Kelty E, Joyce D, Hulse G. A retrospective cohort study of mortality rates in patients with an opioid use disorder treated with implant naltrexone, oral methadone or sublingual buprenorphine. THE AMERICAN JOURNAL OF DRUG AND ALCOHOL ABUSE 2019; 45:285-291. [DOI: 10.1080/00952990.2018.1545131] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Erin Kelty
- Discipline of Psychiatry, University of Western Australia, Nedlands, Western Australian, Australia
- School of Population and Global Health, University of Western Australia, Crawley, Western Australian, Australia
| | - David Joyce
- School of Medicine and Pharmacology, University of Western Australia, Crawley, Western Australia, Australia
| | - Gary Hulse
- Discipline of Psychiatry, University of Western Australia, Nedlands, Western Australian, Australia
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Bisaga A, Mannelli P, Sullivan MA, Vosburg SK, Compton P, Woody GE, Kosten TR. Antagonists in the medical management of opioid use disorders: Historical and existing treatment strategies. Am J Addict 2018; 27:177-187. [PMID: 29596725 PMCID: PMC5900907 DOI: 10.1111/ajad.12711] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 03/02/2018] [Accepted: 03/03/2018] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND AND OBJECTIVES Opioid use disorder (OUD) is a chronic condition with potentially severe health and social consequences. Many who develop moderate to severe OUD will repeatedly seek treatment or interact with medical care via emergency department visits or hospitalizations. Thus, there is an urgent need to develop feasible and effective approaches to help persons with OUD achieve and maintain abstinence from opioids. Treatment that includes one of the three FDA-approved medications is an evidence-based strategy to manage OUD. The purpose of this review is to address practices for managing persons with moderate to severe OUD with a focus on opioid withdrawal and naltrexone-based relapse-prevention treatment. METHODS Literature available on PubMed was used to review the evolution of treatment strategies from the 1960s onward to manage opioid withdrawal and initiate treatment with naltrexone. RESULTS Emerging practices for extended-release naltrexone induction include the use of agonist tapers and adjuvant medications. Clinical challenges frequently encountered when initiating this therapy include managing withdrawal and ongoing opioid use during treatment. Clinical factors may inform decisions regarding patient selection and length of naltrexone treatment, such as recent opioid use and patient preferences. CONCLUSIONS AND SCIENTIFIC SIGNIFICANCE Treatment strategies to manage opioid withdrawal have evolved, but many patients with OUD do not receive medication for the prevention of relapse. Clinical strategies for induction onto extended-release naltrexone are now available and can be safely and effectively implemented in specialty and select primary care settings. (© 2018 The Authors. The American Journal on Addictions Published by Wiley Periodicals, Inc. on behalf of The American Academy of Addiction Psychiatry (AAAP);27:177-187).
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Affiliation(s)
- Adam Bisaga
- Department of PsychiatryColumbia University College of Physicians and SurgeonsNew YorkNew York
| | - Paolo Mannelli
- Department of Psychiatry and Behavioral SciencesDuke University Medical CenterDurhamNorth Carolina
| | - Maria A. Sullivan
- Department of PsychiatryColumbia University College of Physicians and SurgeonsNew YorkNew York
- Alkermes Inc.WalthamMassachusetts
| | | | - Peggy Compton
- Department of Family and Community HealthSchool of NursingUniversity of PennsylvaniaPhiladelphiaPennsylvania
| | - George E. Woody
- Department of PsychiatryPerelman School of Medicine at the University of PennsylvaniaPhiladelphiaPennsylvania
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Rates of Hospital and Emergency Department Attendances in Opiate-dependent Patients Treated With Implant Naltrexone, Methadone, or Buprenorphine. ADDICTIVE DISORDERS & THEIR TREATMENT 2017. [DOI: 10.1097/adt.0000000000000101] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Benéitez MC, Gil-Alegre ME. Opioid Addiction: Social Problems Associated and Implications of Both Current and Possible Future Treatments, including Polymeric Therapeutics for Giving Up the Habit of Opioid Consumption. BIOMED RESEARCH INTERNATIONAL 2017; 2017:7120815. [PMID: 28607934 PMCID: PMC5451777 DOI: 10.1155/2017/7120815] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 02/20/2017] [Accepted: 04/23/2017] [Indexed: 11/17/2022]
Abstract
BACKGROUND Detoxification programmes seek to implement the most secure and compassionate ways of withdrawing from opiates so that the inevitable withdrawal symptoms and other complications are minimized. Once detoxification has been achieved, the next stage is to enable the patient to overcome his or her drug addiction by ensuring consumption is permanently and completely abandoned, only after which can the subject be regarded as fully recovered. METHODS A systematic search on the common databases of relevant papers published until 2016 inclusive. RESULTS AND CONCLUSION Our study of the available oral treatments for opioid dependence has revealed that no current treatment can actually claim to be fully effective. These treatments require daily oral administration and, consequently, regular visits to dispensaries, which in most cases results in a lack of patient compliance, which causes fluctuations in drug plasma levels. We then reviewed alternative treatments in the available scientific literature on polymeric sustained release formulations. Research has been done not only on release systems for detoxification but also on release systems for giving up the habit of taking opioids. These efforts have obtained the recent authorization of polymeric systems for use in patients that could help them to reduce their craving for drugs.
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Affiliation(s)
- M. Cristina Benéitez
- Department of Pharmacy and Pharmaceutical Technology, Complutense University of Madrid, 28040 Madrid, Spain
| | - M. Esther Gil-Alegre
- Department of Pharmacy and Pharmaceutical Technology, Complutense University of Madrid, 28040 Madrid, Spain
- University Institute of Industrial Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain
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10
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Hood SD, Norman A, Hince DA, Melichar JK, Hulse GK. Benzodiazepine dependence and its treatment with low dose flumazenil. Br J Clin Pharmacol 2014; 77:285-94. [PMID: 23126253 DOI: 10.1111/bcp.12023] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Accepted: 10/30/2012] [Indexed: 11/29/2022] Open
Abstract
Globally benzodiazepines remain one of the most prescribed medication groups, especially in the primary care setting. With such high levels of prescribing it is not surprising that benzodiazepine dependence is common, cutting across all socioeconomic levels. Despite recognition of the potential for the development of iatrogenic dependence and the lack of any effective treatment, benzodiazepines continue to be widely prescribed in general practice. Conventional dependence management, benzodiazepine tapering, is commonly a protracted process over several weeks or months. It is often associated with significant withdrawal symptoms and craving leading to patient drop out and return to use. Accordingly, there is a worldwide need to find effective pharmacotherapeutic interventions for benzodiazepine dependence. One drug of increasing interest is the GABAA benzodiazepine receptor antagonist/partial agonist, flumazenil. Multiple bolus intravenous infusions of low dose flumazenil used either with or without benzodiazepine tapering can reduce withdrawal sequelae, and/or longer term symptoms in the months following withdrawal. Preliminary data suggest that continuous intravenous or subcutaneous flumazenil infusion for 4 days significantly reduces acute benzodiazepine withdrawal sequelae. The subcutaneous infusion was shown to be tissue compatible so the development of a longer acting (i.e. several weeks) depot flumazenil formulation has been explored. This could be capable of managing both acute and longer term benzodiazepine withdrawal sequelae. Preliminary in vitro water bath and in vivo biocompatibility data in sheep show that such an implant is feasible and so is likely to be used in clinical trials in the near future.
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Affiliation(s)
- Sean David Hood
- School of Psychiatry and Clinical Neurosciences, The University of Western Australia, Perth, WA, Australia
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11
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Brewer C, de Jong C, Williams J. Rapid opiate detoxification and antagonist induction under general anaesthesia or intravenous sedation is humane, sometimes essential and should always be an option. Three illustrative case reports involving diabetes and epilepsy and a review of the literature. J Psychopharmacol 2014; 28:67-75. [PMID: 24043724 DOI: 10.1177/0269881113504835] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
When abstinence is an appropriate goal, controlled studies and systematic reviews confirm that rapid, antagonist-precipitated opiate withdrawal procedures are the most effective and cost effective methods of initiating abstinence, and naltrexone (NTX) maintenance. While 'rapid' withdrawal, better conceptualised as Rapid Antagonist Induction (RAI), can often be humanely achieved with modest sedation levels, we present three case histories to support our argument that for some patients, general anaesthesia (GA), or techniques of intravenous sedation (IVS) that approach GA, are essential for safety and success. This includes patients with intercurrent disease (e.g. epilepsy or insulin-dependent diabetes) but also those with severe withdrawal phobia after previous distressing experiences. We discuss the history of the procedure. The dangers of RAI under GA or IVS in experienced hands have been exaggerated and the appropriate expertise should be more easily available. Patients and clinicians readily accept risks of major surgery for the excessive intake of food that causes most obesity. Similar risk-acceptance exists in cosmetic surgery and obstetrics. The increasing use and effectiveness of long-acting implants or depot-injections of NTX for relapse-prevention have largely solved compliance problems that undermined the potential of oral NTX. Their ability to prevent opiate overdose in abstinent, non-tolerant patients also strengthens arguments both for offering RAI as a therapeutic option and for reducing psychological, professional and practical barriers to using it.
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Larney S, Gowing L, Mattick RP, Farrell M, Hall W, Degenhardt L. A systematic review and meta-analysis of naltrexone implants for the treatment of opioid dependence. Drug Alcohol Rev 2013; 33:115-28. [PMID: 24299657 DOI: 10.1111/dar.12095] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Accepted: 11/06/2013] [Indexed: 11/28/2022]
Abstract
INTRODUCTION AND AIMS Naltrexone implants are used to treat opioid dependence, but their safety and efficacy remain poorly understood. We systematically reviewed the literature to assess the safety and efficacy of naltrexone implants for treating opioid dependence. DESIGN AND METHODS Studies were eligible if they compared naltrexone implants with another intervention or placebo. Examined outcomes were induction to treatment, retention in treatment, opioid and non-opioid use, adverse events, non-fatal overdose and mortality. Quality of the evidence was assessed using the Grading of Recommendations Assessment, Development, and Evaluation approach. Data from randomised studies were combined using meta-analysis. Data from non-randomised studies were presented narratively. RESULTS Five randomised trials (n = 576) and four non-randomised studies (n = 8358) were eligible for review. The quality of the evidence ranged from moderate to very low. Naltrexone implants were superior to placebo implants [risk ratio (RR): 0.57; 95% confidence interval (CI) 0.48, 0.68; k = 2] and oral naltrexone (RR: 0.57; 95% CI 0.47, 0.70; k = 2) in suppressing opioid use. No difference in opioid use was observed between naltrexone implants and methadone maintenance (standardised mean difference: -0.33; 95% CI -0.93, 0.26; k = 1); however, this finding was based on low-quality evidence from one study. DISCUSSION The evidence on safety and efficacy of naltrexone implants is limited in quantity and quality, and the evidence has little clinical utility in settings where effective treatments for opioid dependence are used. CONCLUSION Better designed research is needed to establish the safety and efficacy of naltrexone implants. Until such time, their use should be limited to clinical trials. [Larney S, Gowing L, Mattick RP, Farrell M, Hall W, Degenhardt L. A systematic review and meta-analysis of naltrexone implants for the treatment of opioid dependence.
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Affiliation(s)
- Sarah Larney
- National Drug and Alcohol Research Centre, University of New South Wales, Sydney, Australia; Alpert Medical School, Brown University, Sydney, Australia
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Abstract
Stimulant-related disorders (SRD) continue to be an important public health problem for which there are presently no approved pharmacotherapies. Although behavioral interventions provide some benefit response varies. The development of novel and effective pharmacotherapies continues to be a research priority. Understanding neural mechanisms critical to the action of stimulants has helped reveal several potential pharmacotherapies that have already shown promise in controlled clinical trials. Common to some of these medications is the ability to reverse neural deficits in individuals with SRD. Results from thoroughly conducted clinical trials continue to broaden our knowledge increasing the possibility of soon developing effective pharmacotherapies for SRD.
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Reece AS, Hulse GK. Reduction in arterial stiffness and vascular age by naltrexone-induced interruption of opiate agonism: a cohort study. BMJ Open 2013; 3:bmjopen-2013-002610. [PMID: 23524044 PMCID: PMC3612814 DOI: 10.1136/bmjopen-2013-002610] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
OBJECTIVE To prospectively assess if opiate antagonist treatment or the opiate-free status could reverse opiate-related vasculopathy. DESIGN Longitudinal Open Observational, Serial 'N of One', over 6.5 years under various treatment conditions: opiate dependence, naltrexone and opiate-free. SETTING Primary care, Australia. PARTICIPANTS 20 opiate-dependent patients (16 males: 16 cases of buprenorphine 4.11±1.17 mg, two of methadone 57.5±12.5 mg and two of heroin 0.75±0.25 g). INTERVENTION Studies of central arterial stiffness and vascular reference age (RA) were performed longitudinally by SphygmoCor Pulse Wave Analysis (AtCor, Sydney). PRIMARY OUTCOMES Primary outcome was vascular age and arterial stiffness accrual under different treatment conditions. RESULTS The mean chronological age (CA) was 33.62±2.03 years. The opiate-free condition was associated with a lower apparent vascular age both in itself (males: p=0.0402 and females: p=0.0360) and in interaction with time (males: p=0.0001 and females: p=0.0004), and confirmed with other measures of arterial stiffness. The mean modelled RA was 38.82, 37.73 and 35.05 years in the opiate, naltrexone and opiate-free conditions, respectively. The opiate-free condition was superior to opiate agonism after full multivariate adjustment (p=0.0131), with modelled RA/CA of 1.0173, 0.9563 and 0.8985 (reductions of 6.1% and 11.9%, respectively). CONCLUSIONS Data demonstrate that opiate-free status improves vascular age and arterial stiffness in previous chronic opiate users. The role of opiate antagonist treatment in achieving these outcomes requires future clarification and offers hope of novel therapeutic remediation.
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Affiliation(s)
- Albert Stuart Reece
- Unit for Research and Education in Alcohol and Drugs, School of Psychiatry and Clinical Neurosciences, University of Western Australia, Crawley, Perth, Western Australia, Australia
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15
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Kelty E, Thomson K, Carlstein S, Sinclair R, Hulse G. A Retrospective Assessment of the Use of Naltrexone Implants for the Treatment of Problematic Amphetamine Use. Am J Addict 2013; 22:1-6. [DOI: 10.1111/j.1521-0391.2013.00320.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2011] [Revised: 08/26/2011] [Accepted: 11/07/2011] [Indexed: 11/30/2022] Open
Affiliation(s)
- Erin Kelty
- Fresh Start Recovery Programme; Subiaco, Western Australia Australia
- Unit for Research and Education in Drugs and Alcohol, School of Psychiatry and Clinical Neurosciences; The University of Western Australia; Crawley, Western Australia Australia
| | - Karen Thomson
- Fresh Start Recovery Programme; Subiaco, Western Australia Australia
| | - Sarah Carlstein
- Fresh Start Recovery Programme; Subiaco, Western Australia Australia
| | - Rebecca Sinclair
- Fresh Start Recovery Programme; Subiaco, Western Australia Australia
| | - Gary Hulse
- Unit for Research and Education in Drugs and Alcohol, School of Psychiatry and Clinical Neurosciences; The University of Western Australia; Crawley, Western Australia Australia
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16
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Farid WO, Lawrence AJ, Krstew EV, Tait RJ, Hulse GK, Dunlop SA. Maternally administered sustained-release naltrexone in rats affects offspring neurochemistry and behaviour in adulthood. PLoS One 2012; 7:e52812. [PMID: 23300784 PMCID: PMC3530485 DOI: 10.1371/journal.pone.0052812] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Accepted: 11/21/2012] [Indexed: 02/06/2023] Open
Abstract
Naltrexone is not recommended during pregnancy. However, sustained-release naltrexone implant use in humans has resulted in cases of inadvertent foetal exposure. Here, we used clinically relevant dosing to examine the effects of maternally administered sustained-release naltrexone on the rat brain by examining offspring at birth and in adulthood. Maternal treatment (naltrexone or placebo implant) started before conception and ceased during gestation, birth or weaning. Morphometry was assessed in offspring at birth and adulthood. Adult offspring were evaluated for differences in locomotor behaviour (basal and morphine-induced, 10 mg/kg, s.c.) and opioid neurochemistry, propensity to self-administer morphine and cue-induced drug-seeking after abstinence. Blood analysis confirmed offspring exposure to naltrexone during gestation, birth and weaning. Naltrexone exposure increased litter size and reduced offspring birth-weight but did not alter brain morphometry. Compared to placebo, basal motor activity of naltrexone-exposed adult offspring was lower, yet they showed enhanced development of psychomotor sensitization to morphine. Developmental naltrexone exposure was associated with resistance to morphine-induced down-regulation of striatal preproenkephalin mRNA expression in adulthood. Adult offspring also exhibited greater operant responding for morphine and, in addition, cue-induced drug-seeking was enhanced. Collectively, these data show pronounced effects of developmental naltrexone exposure, some of which persist into adulthood, highlighting the need for follow up of humans that were exposed to naltrexone in utero.
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Affiliation(s)
- Waleed O. Farid
- Experimental and Regenerative Neurosciences, School of Animal Biology, The University of Western Australia, Perth, Western Australia, Australia
- Unit for Research and Education in Drugs and Alcohol, School of Psychiatry and Clinical Neurosciences, The University of Western Australia, Perth, Western Australia, Australia
| | - Andrew J. Lawrence
- Florey Neuroscience Institutes, The University of Melbourne, Melbourne, Victoria, Australia
- Centre for Neuroscience, The University of Melbourne, Melbourne, Victoria, Australia
| | - Elena V. Krstew
- Florey Neuroscience Institutes, The University of Melbourne, Melbourne, Victoria, Australia
| | - Robert J. Tait
- Unit for Research and Education in Drugs and Alcohol, School of Psychiatry and Clinical Neurosciences, The University of Western Australia, Perth, Western Australia, Australia
- Centre for Mental Health Research, The Australian National University, Canberra, Australian Capital Territory, Australia
| | - Gary K. Hulse
- Unit for Research and Education in Drugs and Alcohol, School of Psychiatry and Clinical Neurosciences, The University of Western Australia, Perth, Western Australia, Australia
| | - Sarah A. Dunlop
- Experimental and Regenerative Neurosciences, School of Animal Biology, The University of Western Australia, Perth, Western Australia, Australia
- The Western Australian Institute for Medical Research, Perth, Western Australia, Australia
- * E-mail:
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Lobmaier PP, Kunøe N, Gossop M, Waal H. Naltrexone depot formulations for opioid and alcohol dependence: a systematic review. CNS Neurosci Ther 2012; 17:629-36. [PMID: 21554565 DOI: 10.1111/j.1755-5949.2010.00194.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Naltrexone is an opioid receptor antagonist that blocks the reinforcing effects of opioids and reduces alcohol consumption and craving. It has no abuse potential, mild and transient side effects, and thus appears an ideal pharmacotherapy for opioid dependence. Its effectiveness in alcohol dependence is less evident, but compliance with naltrexone combined with psychosocial support has been repeatedly shown to improve drinking outcomes. Limited compliance with oral naltrexone treatment is a known drawback. Several naltrexone implant and injectable depot formulations are being investigated and provide naltrexone release for at least 1 month. Studies among opioid-dependent patients indicate significant reductions in heroin use, but sample sizes are usually small. In alcohol dependence, two large multicenter trials report alcohol and craving reductions for naltrexone and placebo groups, indicating a significant but moderate effect. The pharmacokinetic profile of the injectable formulation indicates reliable naltrexone release over 1 month at therapeutic levels. Implant formulations releasing naltrexone up to 7 months are reported. Findings on safety and tolerability confirm the generally mild adverse effects described for naltrexone tablets. However, further research on therapeutic levels (i.e., opioid blocking) is warranted. The majority of naltrexone implants lacks approval for regular clinical use and larger longitudinal studies are needed. The available naltrexone depot formulations have the potential to significantly improve medication compliance in opioid and alcohol dependence. In certain circumstances, they may constitute a promising new treatment option.
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Reece AS. Epidemiologic and Molecular Pathophysiology of Chronic Opioid Dependence and the Place of Naltrexone Extended-Release Formulations in its Clinical Management. Subst Abuse 2012; 6:115-33. [PMID: 23055738 PMCID: PMC3465087 DOI: 10.4137/sart.s9031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Naltrexone implants and depot injections (NI) are a novel form of treatment for opiate dependence (OD). Major questions relate to their absolute and relative efficacy and safety. Opportunely, six recent clinical trial data from several continents have uniformly provided dramatic evidence of the potent, dose-related and highly significant efficacy of NI, with minimal or manageable accompanying toxicity and safety concerns. The opiate-free lifestyle is attained significantly more often with NI adjusted O.R. = 6.00 (95% C.I. 3.86–9.50), P < 10−10. Other drug use and drug craving are also rapidly reduced. The optimum manner in which to commence NI remains to be established. Of particular relevance is the relative safety of NI compared to the chronic opiate agonists (COA) usually employed, as the long-term toxicity of COA is only just being elucidated. Large population-based studies have found elevated rates of cardiovascular disease, six cancers, liver and respiratory disease, and all-cause mortality in COA. Whilst opiates have been shown to trigger numerous molecular pathways, the most interesting is the demonstration that the opiate morphinan’s nucleus binds to the endotoxin groove of the TLR4-MD2 heterodimer. This has the effect of triggering a low grade endotoxaemic-like state, which over time may account for these protean clinical findings, an effect which is reversed by opiate antagonists. This emerging evidence suggests an exciting new treatment paradigm for OD and a corresponding increase in the role of NI in treatment.
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Affiliation(s)
- Albert Stuart Reece
- School of Psychiatry and Clinical Neurosciences, University of Western Australia
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Ling W, Mooney L, Zhao M, Nielsen S, Torrington M, Miotto K. Selective review and commentary on emerging pharmacotherapies for opioid addiction. Subst Abuse Rehabil 2011; 2:181-8. [PMID: 24474855 PMCID: PMC3846315 DOI: 10.2147/sar.s22782] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Pharmacotherapies for opioid addiction under active development in the US include lofexidine (primarily for managing withdrawal symptoms) and Probuphine®, a distinctive mode of delivering buprenorphine for six months, thus relieving patients, clinicians, and regulatory personnel from most concerns about diversion, misuse, and unintended exposure in children. In addition, two recently approved formulations of previously proven medications are in early phases of implementation. The sublingual film form of buprenorphine + naloxone (Suboxone®) provides a less divertible, more quickly administered, more child-proof version than the buprenorphine + naloxone sublingual tablet. The injectable depot form of naltrexone (Vivitrol®) ensures consistent opioid receptor blockade for one month between administrations, removing concerns about medication compliance. The clinical implications of these developments have attracted increasing attention from clinicians and policymakers in the US and around the world, especially given that human immunodeficiency virus/acquired immunodeficiency syndrome and other infectious diseases are recognized as companions to opioid addiction, commanding more efforts to reduce opioid addiction. While research and practice improvement efforts continue, reluctance to adopt new medications and procedures can be expected, especially considerations in the regulatory process and in the course of implementation. Best practices and improved outcomes will ultimately emerge from continued development efforts that reflect input from many quarters.
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Affiliation(s)
- Walter Ling
- Integrated Substance Abuse Programs, University of California, Los Angeles, CA, USA
| | - Larissa Mooney
- Integrated Substance Abuse Programs, University of California, Los Angeles, CA, USA
| | - Min Zhao
- Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Suzanne Nielsen
- Integrated Substance Abuse Programs, University of California, Los Angeles, CA, USA
| | - Matthew Torrington
- Integrated Substance Abuse Programs, University of California, Los Angeles, CA, USA
| | - Karen Miotto
- Integrated Substance Abuse Programs, University of California, Los Angeles, CA, USA
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Ngo HTT, Tait RJ, Hulse GK. Hospital psychiatric comorbidity and its role in heroin dependence treatment outcomes using naltrexone implant or methadone maintenance. J Psychopharmacol 2011; 25:774-82. [PMID: 20360157 DOI: 10.1177/0269881110364266] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Our objectives were to (i) estimate lifetime prevalence of psychiatric comorbidity in heroin users and (ii) evaluate psychiatric comorbidity as a predictor of drug-related hospitalization following either (a) methadone maintenance or (b) naltrexone implant treatment. Our method consisted of retrospective, longitudinal follow-up using prospectively collected, state-wide hospital data on two cohorts of heroin-dependent persons (Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition), first time treated with naltrexone implant (n = 317) or methadone (n = 521) between January 2001 and December 2002. Outcome measures were: (i) prevalence of comorbidity and (ii) changes in risk for drug-related hospitalization - categorized as 'opioid drugs', 'non-opioid drugs', and 'any drug' - to 3.5 years post-treatment. Nearly 32% had psychiatric comorbidity. In both cohorts, comorbid patients generally had significantly greater odds of drug-related hospitalization pre-treatment compared with non-comorbid counterparts. These differences generally reduced in magnitude post-treatment. Comorbid naltrexone-treated patients had less 'opioid' and 'any drug' related hospitalizations post-treatment. Similarly, comorbid methadone-treated patients had reduced hospitalization risk for 'non-opioid' and 'any drug' related hospitalization post-treatment. Treatment of persons without depression, anxiety, or personality disorder with naltrexone implant was associated with increased risk of 'non-opioid' drug-related hospitalization, while methadone treatment was associated with increased risk of 'opioid' drug-related hospitalization. Although comorbid heroin users entered treatment with significantly higher risk of drug-related hospitalization than non-comorbid users, substantial reductions in drug-related hospitalization were generally observed post-treatment. This challenges the view that comorbidity predicts poor drug treatment outcomes. Differences in research methodology were noted; recommendation for rigorous analytical methodology in future research on assessing treatment outcomes was accordingly offered.
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Affiliation(s)
- Hanh T T Ngo
- School of Psychiatry and Clinical Neurosciences, University of Western Australia, Crawley, WA, Australia.
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Mannelli P, Peindl KS, Wu LT. Pharmacological enhancement of naltrexone treatment for opioid dependence: a review. Subst Abuse Rehabil 2011; 2011:113-123. [PMID: 21731898 PMCID: PMC3128868 DOI: 10.2147/sar.s15853] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
PURPOSE: Opioid dependence (OD) is a serious and growing clinical condition with increasing social costs that requires expanding treatment beyond opioid agonist substitution. The opioid antagonist naltrexone has displayed a remarkable association of theoretical effectiveness and poor clinical utility in treating OD due to noncompliant behavior and low acceptability among patients, only partly modified by psychosocial interventions. We reviewed pharmacological studies, including naltrexone depot formulations and combination treatments. METHOD: We searched PubMed for clinical studies on the use of naltrexone implants and slow-release injections in OD, and investigations using adjunct medications to improve naltrexone maintenance therapy of OD. We discussed the results in view of their application to the clinical practice. RESULTS: Significant reduction in opioid use and improved retention in treatment have been found in several studies using depot naltrexone formulations, some of which are controlled clinical trials. Pilot investigations have gathered initial positive results on the use of naltrexone in combination with serotonin reuptake inhibitors, α-2 adrenergic, opioid, and γ-aminobutyric acid agonist medications. CONCLUSION: Current evidence suggests that more research on effectiveness and safety is needed in support of depot naltrexone treatment for OD. Further research comparing slow-release with oral naltrexone and opioid agonist medications will help characterize the role of opioid antagonist-mediated treatment of OD. Preliminary investigations on naltrexone combination treatments suggest the opportunity to continue study of new mixed receptor activities for the treatment of OD and other drug addictions.
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Affiliation(s)
- Paolo Mannelli
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, USA
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Abstract
Several reports express concern at the mortality associated with the use of oral naltrexone for opiate dependency. Registry controlled follow-up of patients treated with naltrexone implant and buprenorphine was performed. In the study, 255 naltrexone implant patients were followed for a mean (+/- standard deviation) of 5.22 +/- 1.87 years and 2,518 buprenorphine patients were followed for a mean (+/- standard deviation) of 3.19 +/- 1.61 years, accruing 1,332.22 and 8,030.02 patient-years of follow-up, respectively. The crude mortality rates were 3.00 and 5.35 per 1,000 patient-years, respectively, and the age standardized mortality rate ratio for naltrexone compared to buprenorphine was 0.676 (95% confidence interval = 0.014 to 1.338). Most sex, treatment group, and age comparisons significantly favored the naltrexone implant group. Mortality rates were shown to be comparable to, and intermediate between, published mortality rates of an age-standardized methadone treated cohort and the Australian population. These data suggest that the mortality rate from naltrexone implant is comparable to that of buprenorphine, methadone, and the Australian population.
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Affiliation(s)
- Albert Stuart Reece
- Southcity Family Medical Centre and University of Queensland Medical School, Queensland, Australia.
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Kunøe N, Lobmaier P, Vederhus JK, Hjerkinn B, Gossop M, Hegstad S, Kristensen Ø, Waal H. Challenges to antagonist blockade during sustained-release naltrexone treatment. Addiction 2010; 105:1633-9. [PMID: 20707781 DOI: 10.1111/j.1360-0443.2010.03031.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
AIMS Naltrexone is a competitive opioid antagonist that effectively blocks the action of heroin and other opioid agonists. Sustained-release naltrexone formulations are now available that provide long-acting opioid blockade. This study investigates the use of heroin and other opioids among opioid-dependent patients receiving treatment with long-acting naltrexone implants, their subjective experience of drug 'high' after opioid use, and factors associated with opioid use. METHODS Participants (n = 60) were opioid-dependent patients receiving treatment with naltrexone implants. Outcome data on substance use, drug 'high', depression and criminal activity were collected over a 6-month period. Blood samples were taken to monitor naltrexone plasma levels, and hair samples to verify self-reported opioid use. FINDINGS More than half [n = 34 or 56%; 95% confidence interval (CI) 44-68%)] the patients challenged the blockade with illicit opioids during the 6-month treatment period; 44% (n = 26; 95% CI 32-56%) were abstinent from opioids. Mean opioid use was reduced from 18 [standard deviation (SD)13] days during the month preceding treatment to 6 days (SD 11) after 6 months. Of the respondents questioned on opioid 'high' (n = 31), nine patients (30%; 95% CI 16-47%) reported partial drug 'high' following illicit opioid use, and three (12%; 95% CI 3-26%) reported full 'high'. Opioid use was associated with use of non-opioid drugs and criminal behaviour. CONCLUSIONS Challenging naltrexone blockade with heroin on at least one occasion is common among sustained-release naltrexone patients, but only a minority of patients use opioids regularly. Challenges represent a warning sign for poor outcomes and often occur in the context of polydrug use and social adjustment problems.
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Affiliation(s)
- Nikolaj Kunøe
- SERAF, Norwegian Centre for Addiction Research, Kirkeveien 166, 0407 Oslo, Norway.
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Hulse GK, Ngo HTT, Tait RJ. Risk factors for craving and relapse in heroin users treated with oral or implant naltrexone. Biol Psychiatry 2010; 68:296-302. [PMID: 20537615 DOI: 10.1016/j.biopsych.2010.04.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2009] [Revised: 04/05/2010] [Accepted: 04/07/2010] [Indexed: 10/19/2022]
Abstract
BACKGROUND Oral naltrexone effectively antagonizes heroin, but patient noncompliance limits its utility; sustained-release preparations may overcome this. Few data are available on optimal blood naltrexone levels for preventing craving and/or return to heroin use. This study assesses various risk factors, including blood naltrexone level, for heroin craving and relapse to illicit opioids. METHODS Heroin-dependent persons from a randomized controlled trial of oral versus implant naltrexone were followed up for 6 months. Thirty-four participants received 50 mg oral naltrexone daily, plus placebo implant; thirty-five participants received a single dose of 2.3 g naltrexone implant, plus daily oral placebo tablets. RESULTS Compared to oral naltrexone patients, implant naltrexone patients were significantly less likely to use any opioids and had one-fifth the risk of using heroin > or = weekly. Risk of > or = weekly heroin use increased by 2.5 times at blood naltrexone concentration < .5 ng/mL compared with > or = .5 ng/mL, with 3 ng/mL associated with very low risk of use. Craving remained near "floor" levels for implant patients but rebounded to higher levels among oral patients. Lower craving scores (< or = 20/70) predicted lower relapse risk. Noncompliance with daily oral formula, higher baseline craving, longer history of use, and being younger predicted higher craving at follow-up. CONCLUSIONS Implant naltrexone was better associated with reduced heroin craving and relapse than oral naltrexone. Effective treatment was achieved at blood naltrexone levels of 1 ng/mL to 3 ng/mL, with higher levels associated with greater efficacy. Craving assessment may be valuable in predicting relapse risk allowing timely intervention.
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Affiliation(s)
- Gary K Hulse
- School of Psychiatry and Clinical Neurosciences, University of Western Australia, Crawley, Western Australia
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Hulse GK, O'Neil G, Arnold‐Reed DE. Management of an opioid‐impaired anaesthetist by implantable naltrexone. JOURNAL OF SUBSTANCE USE 2009. [DOI: 10.1080/14659890410001665087] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Gary K Hulse
- School of Psychiatry & Clinical Neurosciences, University of Western Australia, Perth, Australia
| | - George O'Neil
- Australian Medical Procedures Research Foundation, Perth, Australia
| | - Diane E Arnold‐Reed
- School of Psychiatry & Clinical Neurosciences, University of Western Australia, Perth, Australia
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Kunøe N, Lobmaier P, Vederhus JK, Hjerkinn B, Hegstad S, Gossop M, Kristensen Ø, Waal H. Naltrexone implants after in-patient treatment for opioid dependence: randomised controlled trial. Br J Psychiatry 2009; 194:541-6. [PMID: 19478295 DOI: 10.1192/bjp.bp.108.055319] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND Naltrexone has considerable potential in helping to prevent relapse in heroin dependency. A longer-lasting formulation for naltrexone treatment is desirable to further reduce non-adherence and relapse during treatment of opiate dependence. AIMS To evaluate the safety and effectiveness of a 6-month naltrexone implant in reducing opioid use after in-patient treatment. METHOD A group of 56 abstinence-oriented patients who completed in-patient treatment for opioid dependence were randomly and openly assigned to receive either a 6-month naltrexone implant or their usual aftercare. Drug use and other outcomes were assessed at 6-month follow-up. RESULTS Patients receiving naltrexone had on average 45 days less heroin use and 60 days less opioid use than controls in the 180-day period (both P<0.05). Blood tests showed naltrexone levels above 1 ng/ml for the duration of 6 months. Two patients died, neither of whom had received an implant. CONCLUSIONS Naltrexone implant treatment safely and significantly reduces opioid use in a motivated population of patients.
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Affiliation(s)
- Nikolaj Kunøe
- Norwegian Centre for Addiction Research, Kirkeveien 166, Oslo NO-0407, Norway.
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Hulse GK, Low VHS, Stalenberg V, Morris N, Thompson RI, Tait RJ, Phan CT, Ngo HTT, Arnold-Reed DE. Biodegradability of naltrexone-poly(DL) lactide implants in vivo assessed under ultrasound in humans. Addict Biol 2008; 13:364-72. [PMID: 17850414 DOI: 10.1111/j.1369-1600.2007.00081.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ultrasound was used to assess the in vivo biodegradability of a sustained release poly(DL)lactide naltrexone implant in 71 persons previously treated for heroin dependence. We assessed 139 implant sites ranging from 2 to 1808 days post implant. Ultrasound assessment showed that implant tablets were initially well demarcated from each other and from the surrounding tissues. Biodegradation resulted in less demarcated tablets followed by clumping into a single mass-like structure. This mass subsequently dispersed by approximately 1201 days post implant with no implant material visualized by ultrasound. The biodegradation was also assessed by visual clinical examination and palpation of the implant site as well as patient self-report. These measures were generally well correlated with ultrasound results. Clinical assessment of the biodegradation process concluded that the implant changed from 'firm' to 'less firm' and from 'initial square edge' to 'rounded edge' tablets. Collectively, these data provide direct evidence of the in vivo absorption of the Go Medical implant over time, and its biodegradability in humans.
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Affiliation(s)
- Gary K Hulse
- School of Psychiatry and Clinical Neurosciences, University of Western Australia, Australia
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Lintzeris N, Lee S, Scopelliti L, Mabbutt J, Haber PS. Unplanned admissions to two Sydney public hospitals after naltrexone implants. Med J Aust 2008; 188:441-4. [PMID: 18429708 DOI: 10.5694/j.1326-5377.2008.tb01712.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2007] [Accepted: 12/11/2007] [Indexed: 11/17/2022]
Abstract
OBJECTIVE To describe hospital presentations related to the use of naltrexone implants, an unlicensed product used in Australia for treating heroin dependence. DESIGN Retrospective case file audit. SETTING Two Sydney teaching hospitals. PATIENTS Identified through referrals to Drug and Alcohol Consultation-Liaison services over a 12-month period, August 2006 to July 2007. MAIN OUTCOME MEASURES Diagnosis, management and duration of admission. RESULTS Twelve cases were identified: eight were definitely or probably related to naltrexone implants or the implantation procedure (rapid detoxification). Of these, six patients had severe opiate withdrawal and dehydration, with an average hospital stay of 2.3 days. One patient had an infection at the implant site, and one an underlying anxiety disorder requiring psychiatric admission. Three patients had analgesia complications, and one had unrelated cardiac arrhythmia. CONCLUSIONS These severe adverse events challenge the notion that naltrexone implants are a safe procedure and suggest a need for careful case selection and clinical management, and for closer regulatory monitoring to protect this marginalised and vulnerable population.
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Affiliation(s)
- Nicholas Lintzeris
- Drug Health Services, Sydney South West Area Health Service, Sydney, NSW.
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Farid W, Dunlop S, Tait R, Hulse G. The effects of maternally administered methadone, buprenorphine and naltrexone on offspring: review of human and animal data. Curr Neuropharmacol 2008; 6:125-50. [PMID: 19305793 PMCID: PMC2647150 DOI: 10.2174/157015908784533842] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2007] [Revised: 11/20/2007] [Accepted: 12/11/2007] [Indexed: 11/22/2022] Open
Abstract
Most women using heroin are of reproductive age with major risks for their infants. We review clinical and experimental data on fetal, neonatal and postnatal complications associated with methadone, the current "gold standard", and compare these with more recent, but limited, data on developmental effects of buprenorphine, and naltrexone. Methadone is a micro-opioid receptor agonist and is commonly recommended for treatment of opioid dependence during pregnancy. However, it has undesired outcomes including neonatal abstinence syndrome (NAS). Animal studies also indicate detrimental effects on growth, behaviour, neuroanatomy and biochemistry, and increased perinatal mortality. Buprenorphine is a partial micro-opioid receptor agonist and a kappa-opioid receptor antagonist. Clinical observations suggest that buprenorphine during pregnancy is similar to methadone on developmental measures but is potentially superior in reducing the incidence and prognosis of NAS. However, small animal studies demonstrate that low doses of buprenorphine during pregnancy and lactation lead to changes in offspring behaviour, neuroanatomy and biochemistry. Naltrexone is a non-selective opioid receptor antagonist. Although data are limited, humans treated with oral or sustained-release implantable naltrexone suggest outcomes potentially superior to those with methadone or buprenorphine. However, animal studies using oral or injectable naltrexone have shown developmental changes following exposure during pregnancy and lactation, raising concerns about its use in humans. Animal studies using chronic exposure, equivalent to clinical depot formulations, are required to evaluate safety. While each treatment is likely to have maternal advantages and disadvantages, studies are urgently required to determine which is optimal for offspring in the short and long term.
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Affiliation(s)
- W.O Farid
- School of Animal Biology, The University of Western Australia, Nedlands, WA 6009, Australia
- School of Psychiatry and Clinical Neurosciences, The University of Western Australia, Nedlands, WA 6009, Australia
| | - S.A Dunlop
- School of Animal Biology, The University of Western Australia, Nedlands, WA 6009, Australia
- Western Australian Institute for Medical Research, The University of Western Australia, Nedlands, WA 6009, Australia
| | - R.J Tait
- School of Psychiatry and Clinical Neurosciences, The University of Western Australia, Nedlands, WA 6009, Australia
| | - G.K Hulse
- School of Psychiatry and Clinical Neurosciences, The University of Western Australia, Nedlands, WA 6009, Australia
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Abstract
BACKGROUND Naltrexone is an opioid antagonist which effectively blocks heroin effects. Since opioid dependence treatment with naltrexone tablets suffers from high dropout rates, several depot injections and implants are under investigation. Sustained-release formulations are claimed to be effective, but a systematic review of the literature is lacking. OBJECTIVES To evaluate the effectiveness of sustained-release naltrexone for opioid dependence and its adverse effects in different study populations. SEARCH STRATEGY The following databases were searched from their inception to November 2007: Cochrane Central Register of Controlled Trials, MEDLINE, EMBASE, CINAHL, LILACS, PsycINFO, ISI Web of Science, trial database at http://clinicaltrials.gov, available NIDA monographs, CPDD and AAAP conference proceedings. The reference lists of identified studies, published reviews and relevant web sides were searched manually. Study authors and drug companies were contacted to obtain any unpublished material or missing data. SELECTION CRITERIA To evaluate effectiveness only RCTs were included. To evaluate safety, any clinical trial reporting adverse effects was assessed. Treatment condition was extended to include alcohol dependent subjects and healthy volunteers. DATA COLLECTION AND ANALYSIS Reviewers independently evaluated the reports, rated methodological quality and extracted data. Analyses were performed separately for opioid dependent, alcohol dependent and healthy participants. MAIN RESULTS Foe effectiveness, one report met inclusion criteria. Two dosages of naltrexone depot injections (192 and 384 mg) were compared to placebo. High-dose significantly increased days in treatment compared to placebo (WMD 21.00, 95% CI 10.68 to 31.32, p<0.0001). High-dose compared to low-dose significantly increased days in treatment (WMD 12.00, 95% CI 1.69 to 22.31, p=0.02). Number of patients retained in treatment did not show significant differences between groups. For adverse effects, seventeen reports met inclusion criteria analyses, six were RCTs. Side effects were significantly more frequent in naltrexone depot groups compared to placebo. In alcohol dependent samples only, adverse effects appeared to be significantly more frequent in the low-dose naltrexone depot groups compared to placebo (RR 1.18, 95% CI 1.02 to 1.36, p=0.02). In the opioid dependent sample, group differences were not statistically significant. Reports on systematic assessment of side effects and adverse events were scarce. AUTHORS' CONCLUSIONS There is insufficient evidence to evaluate the effectiveness of sustained-release naltrexone for treatment of opioid dependence. For naltrexone injections, administration site-related adverse effects appear to be frequent, but of moderate intensity and time limited. For a harm-benefit evaluation of naltrexone implants, more data on side effects and adverse events are needed.
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Affiliation(s)
- P Lobmaier
- University of Oslo, Norvegian Centre for Addiction Research, Kirkeveien 166, Oslo, Norway, 0407.
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Dean RL, Todtenkopf MS, Deaver DR, Arastu MF, Dong N, Reitano K, O'Driscoll K, Kriksciukaite K, Gastfriend DR. Overriding the blockade of antinociceptive actions of opioids in rats treated with extended-release naltrexone. Pharmacol Biochem Behav 2008; 89:515-22. [PMID: 18342360 DOI: 10.1016/j.pbb.2008.02.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2007] [Revised: 01/28/2008] [Accepted: 02/04/2008] [Indexed: 10/22/2022]
Abstract
A monthly extended-release formulation of the opioid antagonist naltrexone (XR-NTX) is approved for treatment of alcohol dependence. There is little research regarding overriding chronic (>21 days) competitive opioid receptor blockade with opioids for acute pain. Using the hot plate test after XR-NTX or placebo microsphere administration, rats were treated with an opioid analgesic to determine the dose required to produce the maximum response latency (MRL; 60 s). Rats were later treated with the same opioid to determine any potential effects on respiration rate or locomotor activity. In naïve rats, 15 mg/kg morphine, 0.1 mg/kg fentanyl and 8 mg/kg hydrocodone produced MRL. In XR-NTX treated rats, morphine produced 36% and 46% MRL at 90 mg/kg on days 4 and 19 and 96% MRL at 45 mg/kg on day 39. Fentanyl produced 100% MRL at 2.0 mg/kg on days 4 and 19 and at 0.5 mg/kg on day 39. Hydrocodone (80 mg/kg) produced 69%, 80% and 100% MRL on days 4, 19 and 39. Compared to placebo, these doses did not further depress respiration or alter locomotor activity. Thus, opioid receptor blockade with XR-NTX can be overcome in rats with higher doses of opioids without further affecting respiration or locomotor activity.
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Affiliation(s)
- Reginald L Dean
- Department of Life Sciences and Toxicology, Alkermes, Inc., 88 Sidney St., Cambridge, MA 02139, USA.
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Ngo HTT, Arnold-Reed DE, Hansson RC, Tait RJ, Hulse GK. Blood naltrexone levels over time following naltrexone implant. Prog Neuropsychopharmacol Biol Psychiatry 2008; 32:23-8. [PMID: 17651881 DOI: 10.1016/j.pnpbp.2007.06.007] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2006] [Revised: 06/08/2007] [Accepted: 06/08/2007] [Indexed: 11/30/2022]
Abstract
AIMS Oral naltrexone is used in the management of both heroin and alcohol dependence. However, poor compliance has limited its clinical utility. The study's objective was to determine the period of therapeutic coverage (>or=2 ng/ml) provided by a 3.3 g naltrexone subcutaneous implant compared with existing data on 1.1 g and 2.2 g implants. METHODS We assessed free blood naltrexone levels following treatment with a 3.3 g naltrexone implant in heroin dependent patients (n=50) in Perth, Western Australia. Results were compared with previously collated data for patients treated with either a 1.1 g (n=10) or 2.2 g (n=24) implant. RESULTS Following 3.3 g naltrexone implant treatment, free blood naltrexone levels remained above 2 ng/ml for 145 days (95% CI 125-167). In comparison, 1.1 g or 2.2 g implant treatment resulted in 95 days (95% CI 69-121) and 136 days (95% CI 114-158) coverage, respectively. CONCLUSIONS The 3.3 g implant provides longer therapeutic coverage than the 1.1 g implant but not significantly longer than the 2.2 g implant.
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Affiliation(s)
- H T T Ngo
- School of Psychiatry and Clinical Neurosciences, University of Western Australia, QE II Medical Centre, D Block, Nedlands, Western Australia 6009, Australia
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Tait RJ, Ngo HTT, Hulse GK. Mortality in heroin users 3 years after naltrexone implant or methadone maintenance treatment. J Subst Abuse Treat 2007; 35:116-24. [PMID: 17931824 DOI: 10.1016/j.jsat.2007.08.014] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2007] [Accepted: 08/08/2007] [Indexed: 11/30/2022]
Abstract
Concerns that treatment for heroin dependence using naltrexone may increase suicide rates during treatment and fatal overdoses posttreatment have been expressed. There is also disquiet about mortality during induction onto methadone. We assessed mortality during specific periods following treatment with naltrexone implants or methadone. Data were assembled using the Western Australian Data Linkage System. The methadone cohort comprised all those who started methadone in Western Australia during 2001-2002: The naltrexone cohort comprised all Western Australian heroin-dependent persons who received their first implant in 2001-2002. There were 15 (2.7%) deaths in the methadone cohort (n = 553) and 6 (1.8%) deaths in the naltrexone cohort (n = 341). Mortality rates for the "initial 14-day period," "stable treatment," and "overall" were 94.47, 0.0, and 5.83 deaths/1,000 person-years for the methadone group. In the naltrexone group, the rates "during first treatment (0-6 months)," "post first treatment," and overall were 0.0, 4.21, and 3.76 deaths/1,000 person-years. The age-standardized mortality rate ratio for naltrexone compared to methadone was 0.645 (95% confidence interval = 0.123-1.17). Increased mortality during induction onto methadone was confirmed. Evidence relating naltrexone to either increased suicide or overdose was not found. Overall mortality rates for naltrexone implant were similar to those for methadone, but increased mortality during methadone induction was avoided.
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Affiliation(s)
- Robert James Tait
- School of Psychiatry and Clinical Neurosciences, University of Western Australia, QE II Medical Center, Nedlands, WA 6009, Australia.
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Comer SD, Sullivan MA, Hulse GK. Sustained-release naltrexone: novel treatment for opioid dependence. Expert Opin Investig Drugs 2007; 16:1285-94. [PMID: 17685876 DOI: 10.1517/13543784.16.8.1285] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The devastating costs of opioid abuse and dependence underscore the need for effective treatments for these disorders. At present, several different maintenance medications exist for treating opioid dependence, including methadone, buprenorphine and naltrexone. Of these, naltrexone is the only one that possesses no opioid agonist effects. Instead, naltrexone occupies opioid receptors and prevents or reverses the effects produced by opioid agonists. Despite its clear pharmacologic effectiveness, its clinical effectiveness in treating opioid dependence has been disappointing, primarily due to non-compliance with taking the medication. However, the recent availability of sustained-release formulations of naltrexone has renewed interest in this medication. The present paper describes the development of sustained-release naltrexone formulations and discusses the clinical issues associated with their use in treating opioid dependence.
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Affiliation(s)
- Sandra D Comer
- College of Physicians & Surgeons of Columbia University, New York State Psychiatric Institute, Department of Psychiatry, Unit 120, New York, NY 10032, USA.
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Ngo HTT, Tait RJ, Arnold-Reed DE, Hulse GK. Mental health outcomes following naltrexone implant treatment for heroin-dependence. Prog Neuropsychopharmacol Biol Psychiatry 2007; 31:605-12. [PMID: 17229510 DOI: 10.1016/j.pnpbp.2006.12.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2006] [Revised: 11/20/2006] [Accepted: 12/05/2006] [Indexed: 11/22/2022]
Abstract
BACKGROUND Oral naltrexone is an approved treatment for opioid dependence. However, the impact of sustained release naltrexone on the mental health of treated opioid users has not been studied. AIMS To assess if naltrexone via implant treatment was associated with any change in (i) risk, (ii) rate, and (iii) duration for hospital morbidity related to several categories of mental disorders among treated heroin users. METHOD A cohort of 359 heroin users treated with sustained release naltrexone via implants in Western Australia was retrospectively followed up for mental health related outcomes via a health record linkage system over an average period of 1.78 years post-treatment. RESULTS Individual patient's risk for hospital mental diagnoses was not altered after naltrexone implant. On a population cohort level, hospital admission rates related to all mental health problems, except mood disorders, declined significantly post-treatment; however, length of hospital stay did not improve. Overall, young, female patients or those with pre-existing mental illness were more likely than other patients to require hospital care for mental health issues following treatment. Longer period of heroin use was associated with poorer mood outcomes. CONCLUSIONS Naltrexone implants were not associated with an increased risk for hospitalisation due to mental illness, and in most cases, were associated with a decrease in mental related hospital admission rate.
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Affiliation(s)
- Hanh T T Ngo
- School of Psychiatry and Clinical Neurosciences, University of Western Australia, QE II Medical Centre, Nedlands, WA 6009, Australia.
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Gibson AE, Degenhardt LJ, Hall WD. Opioid overdose deaths can occur in patients with naltrexone implants. Med J Aust 2007. [DOI: 10.5694/j.1326-5377.2007.tb00840.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Amy E Gibson
- National Drug and Alcohol Research Centre, University of New South Wales, Sydney, NSW
| | - Louisa J Degenhardt
- National Drug and Alcohol Research Centre, University of New South Wales, Sydney, NSW
| | - Wayne D Hall
- School of Population Health, University of Queensland, Brisbane, QLD
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Iyer SS, Barr WH, Karnes HT. Characterization of a potential medium for ‘biorelevant’ in vitro release testing of a naltrexone implant, employing a validated stability-indicating HPLC method. J Pharm Biomed Anal 2007; 43:845-53. [PMID: 17045445 DOI: 10.1016/j.jpba.2006.08.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2006] [Revised: 08/25/2006] [Accepted: 08/29/2006] [Indexed: 10/24/2022]
Abstract
A variety of factors have been recognized that influence media optimization for drug release studies of implant dosage forms. Of primary importance is selection of a medium that physiologically mimics the milieu at the site of administration (a condition termed 'biorelevance'). We describe in this paper, the characterization of Hanks' balanced salts solution, with necessary modification, for application as a 'biorelevant' medium for in vitro release studies of a biodegradable, subcutaneous implant of naltrexone. A detailed investigation of changes in pH, osmolality and ultraviolet (UV) spectrum as a function of time and temperature was conducted. Variation in the parameters evaluated was found to be within acceptable limits. Validation of a simple and selective, high performance liquid chromatography (HPLC) assay method for naltrexone was carried out to evaluate stability. The calibration curves were linear from 0.16 to 20.00 microg ml(-1). Imprecision and inaccuracy were less than 2% and no interference was observed from degradation peaks. Stability studies of naltrexone indicated the media should be replaced every 7-8 days for real-time testing. This was applied to an investigation of in vitro drug release. The method has been proven to be suitable for investigation of naltrexone released from the implant.
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Affiliation(s)
- Sunil S Iyer
- Department of Pharmaceutics, School of Pharmacy, Virginia Commonwealth University, Richmond, VA 23298-0533, USA
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Jeffrey GP, MacQuillan G, Chua F, Galhenage S, Bull J, Young E, Hulse G, O'Neil G. Hepatitis C virus eradication in intravenous drug users maintained with subcutaneous naltrexone implants. Hepatology 2007; 45:111-7. [PMID: 17187435 DOI: 10.1002/hep.21470] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
UNLABELLED The effectiveness of HCV antiviral therapy in patients who have undergone recent drug dependency treatment and continue to inject drugs sporadically is presently not clear. Patients attending a community-based drug rehabilitation and naltrexone implant clinic from October 2002 until March 2005 were screened for HCV infection and if positive offered further assessment and treatment with interferon and ribavirin therapy. The first 50 patients to commence HCV therapy and complete at least 6 months follow-up were prospectively studied. ETR response (HCV PCR negative) was 34/50 (68%) and SVR 6 months post-treatment was 31/50 (62%). Viral eradication was maintained in those 22 patients that have had 12 months or more post-treatment follow-up. Eleven (22%) patients stopped therapy early due to side effects or poor compliance. Only two patients with an ETR likely reinfected due to unsafe injection practices. One was re-treated and achieved an SVR. Of the patients achieving a 6-month SVR, 17 of 31 patients reported no further IDU and 13 of 31 patients occasional IDU during treatment and this was maintained after HCV treatment cessation. 46% of patients received antidepressant and/or antipsychotic medication during treatment. CONCLUSION This study of HCV treatment in a community-based subcutaneous naltrexone implant clinic found antiviral therapy resulted in a 62% SVR. This result is comparable to that reported in hospital-based clinics in non-IDU patients. The side effect profile and compliance was also similar. HCV antiviral therapy should be offered to this large and currently under treated group.
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Affiliation(s)
- Gary P Jeffrey
- School of Medicine and Pharmacology, The University of Western Australia, Perth, Western Australia, Australia.
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White JM, Lopatko OV. Opioid maintenance: a comparative review of pharmacological strategies. Expert Opin Pharmacother 2006; 8:1-11. [PMID: 17163802 DOI: 10.1517/14656566.8.1.1] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The use of opioids outside of medical practice is a significant health problem with important social and political implications. Although treatment of opioid dependence is traditionally focused on heroin users, there is increasing recognition that a large number of people become dependent through the use of prescription opioids. The necessity for long-term treatment has also been increasingly recognised. At present, there are several pharmacotherapies available for maintenance treatment, including drugs that are full agonists at the opioid receptor (e.g., methadone, slow-release oral morphine), a partial agonist (buprenorphine) and an opioid antagonist (naltrexone). This review examines the existing strategies, highlights problems associated with their use and discusses the opportunities for new treatment approaches, particularly the use of long-acting formulations.
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Affiliation(s)
- Jason M White
- Discipline of Pharmacology, University of Adelaide, SA 5005, Australia.
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Volpicelli JR, Fenton M. Sustained-release naltrexone formulations for the treatment of alcohol and opioid dependence. FUTURE NEUROLOGY 2006. [DOI: 10.2217/14796708.1.4.389] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Naltrexone, an opioid receptor antagonist, is effective in the treatment of alcohol and opioid dependence. An important limitation of the use of oral naltrexone is the lack of efficacy among patients who do not consistently take the medication. The advent of a sustained-release naltrexone addresses the problem of noncompliance. Naltrexone can be compounded into microcapsules that can be injected or implanted, producing a clinical response lasting from 30 days to several months. Several randomized, placebo-controlled clinical trials demonstrate that sustained-release naltrexone is safe and effective for the treatment of both alcohol and opioid dependence. Sustained-release formulations of naltrexone may offer several advantages over its oral formulation with respect to medication compliance, pharmacokinetics, side effect profile and ease of use. Recently, one formulation of sustained-release naltrexone received approval from the US FDA and offers a new option for addiction treatment.
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Affiliation(s)
- Joseph R Volpicelli
- University of Pennsylvania, 40 West Evergreen Ave., Suite 106, Philadelphia, PA 19118, USA
| | - Miriam Fenton
- University of Pennsylvania, 40 West Evergreen Ave., Suite 106, Philadelphia, PA 19118, USA
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Dunbar JL, Turncliff RZ, Dong Q, Silverman BL, Ehrich EW, Lasseter KC. Single- and Multiple-Dose Pharmacokinetics of Long-acting Injectable Naltrexone. Alcohol Clin Exp Res 2006; 30:480-90. [PMID: 16499489 DOI: 10.1111/j.1530-0277.2006.00052.x] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
BACKGROUND Oral naltrexone is effective in the treatment of alcohol dependence; however, a major limitation of its clinical utility is poor patient adherence to the daily dosing schedule. A biodegradable, long-acting naltrexone microsphere formulation was developed to achieve continuous naltrexone exposure for 1 month in the treatment of alcohol dependence. METHODS The single- and multiple-dose safety and pharmacokinetics of a long-acting naltrexone microsphere preparation were evaluated in healthy subjects. One group of subjects (n = 28) received a single dose of oral naltrexone 50 mg followed by a single gluteal intramuscular (IM) injection of long-acting naltrexone 190 or 380 mg or placebo. A different group of subjects (n = 14) received oral naltrexone 50 mg daily for 5 days, followed by IM long-acting naltrexone 380 mg or placebo every 28 days for a total of 4 doses. A 7-day washout period separated oral and IM administrations. Blood samples were collected to determine plasma concentrations of naltrexone and the primary metabolite, 6beta-naltrexol. RESULTS After a single IM injection of long-acting naltrexone 380 mg, naltrexone plasma concentrations were measurable in all subjects for at least 31 days postdose. The pharmacokinetics were proportional to the dose and multiple dose observations were consistent with single dose observations. Mean apparent elimination half-lives for naltrexone and 6beta-naltrexol ranged from 5 to 7 days. Exposure to 6beta-naltrexol was reduced with IM injection compared with that oral administration. No serious adverse events occurred. CONCLUSIONS This study demonstrated that the long-acting naltrexone formulation was well tolerated, displayed predictable pharmacokinetics, and resulted in no meaningful drug accumulation upon multiple dosing. Intramuscular administration avoids first-pass metabolism and changes the exposure ratio of 6beta-naltrexol to naltrexone compared with oral administration. By providing continuous exposure to naltrexone for several weeks following IM injection, this long-acting naltrexone formulation may offer therapeutic benefit to those patients who experience difficulty adhering to the daily administration schedule necessitated by oral naltrexone therapy.
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Waal H, Frogopsahl G, Olsen L, Christophersen AS, Mørland J. Naltrexone implants -- duration, tolerability and clinical usefulness. A pilot study. Eur Addict Res 2006; 12:138-44. [PMID: 16778434 DOI: 10.1159/000092115] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Naltrexone blocks opioid effects effectively, but poor compliance limits the clinical usefulness in the treatment of opioid dependence. Long-acting implanted formulations might increase the clinical feasibility. Several implants have been produced, but few clinical reports have been published. This paper describes an open trial with an Australian implant. This implant is claimed to have duration of up to six months with double implants and acceptable levels of side effects. This was explored in the present pilot study with 13 opioid-dependent patients. By single implant of 1.8 g naltrexone the duration judged by naltrexone plasma levels above 1 ng/ml naltrexone was between 2 and 4 months. Double implants maintained such plasma levels for 5-6.5 months. Clinically, the implants appeared promising. Side effects were minimal. During the period with adequate plasma levels of naltrexone, use of opioids was absent and use of other psychoactive drugs reduced. At 1-year follow-up, the patients rated the implants highly positively.
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Affiliation(s)
- Helge Waal
- Unit for Addiction Medicine, Institute of Psychiatry, University of Oslo, Oslo, Norway.
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Abstract
This paper is the 27th consecutive installment of the annual review of research concerning the endogenous opioid system, now spanning over 30 years of research. It summarizes papers published during 2004 that studied the behavioral effects of molecular, pharmacological and genetic manipulation of opioid peptides, opioid receptors, opioid agonists and opioid antagonists. The particular topics that continue to be covered include the molecular-biochemical effects and neurochemical localization studies of endogenous opioids and their receptors related to behavior, and the roles of these opioid peptides and receptors in pain and analgesia; stress and social status; tolerance and dependence; learning and memory; eating and drinking; alcohol and drugs of abuse; sexual activity and hormones, pregnancy, development and endocrinology; mental illness and mood; seizures and neurologic disorders; electrical-related activity and neurophysiology; general activity and locomotion; gastrointestinal, renal and hepatic functions; cardiovascular responses; respiration and thermoregulation; and immunological responses.
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Affiliation(s)
- Richard J Bodnar
- Department of Psychology and Neuropsychology Doctoral Sub-Program, Queens College, City University of New York, Flushing, NY 11367, USA.
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Hulse GK, Stalenberg V, McCallum D, Smit W, O'neil G, Morris N, Tait RJ. Histological changes over time around the site of sustained release naltrexone-poly(dl-lactide) implants in humans. J Control Release 2005; 108:43-55. [PMID: 16154223 DOI: 10.1016/j.jconrel.2005.08.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2005] [Revised: 07/22/2005] [Accepted: 08/02/2005] [Indexed: 11/28/2022]
Abstract
In order to assess the histological tissue changes over time around the site of implant, tissue biopsies were taken at 1 to 38 months post-implant from 54 (34 male) consenting human subjects who had received the Australian subcutaneous naltrexone-poly(DL-lactide) implant for heroin dependence. The implant consists of multiple tablets containing compressed naltrexone-poly[trans-3,6-dimethyl-1,4-dioxane-2,5-dione] (DL-lactide) loaded microspheres. Assessment of tissue samples by pathologists showed an early phase (up to 12 months post-implant) of inflammation, foreign body reaction, and fibrosis. This subsided gradually over the next 12 months until tissue returned to normal by 25+ months. Sufficient evidence was not available to conclude that the poly(DL-lactide) implant matrix was totally biodegradable within the study period. While implant material was not identified in most of the latter biopsies, its presence was noted in one biopsy at 26 months post-implant. Nevertheless the study results did demonstrate the implant's biocompatibility by the lack of inflammation, foreign body reaction, and fibrosis detected by 25+ months. It seems highly probable that surgical technique rather than the implant itself was associated with the additional finding of fat necrosis. Moderate fat necrosis was observed as a common feature of biopsies carried out during the first 6 months following implant. It subsided to mild levels over the next 18 months, and was notably absent by 25+ months. The results of the study indicated that the Australian naltrexone-poly(DL-lactide) implant is well tolerated and may have a role for use in the management of medical conditions such as heroin dependence.
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Affiliation(s)
- G K Hulse
- Unit for Research and Education in Drugs and Alcohol, School of Psychiatry and Clinical Neurosciences, The University of Western Australia, Crawley, and Department of Pathology, Royal Perth Hospital, WA, Australia.
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Hulse GK, Tait RJ, Comer SD, Sullivan MA, Jacobs IG, Arnold-Reed D. Reducing hospital presentations for opioid overdose in patients treated with sustained release naltrexone implants. Drug Alcohol Depend 2005; 79:351-7. [PMID: 15899557 PMCID: PMC1646626 DOI: 10.1016/j.drugalcdep.2005.02.009] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2004] [Revised: 02/21/2005] [Accepted: 02/26/2005] [Indexed: 11/22/2022]
Abstract
BACKGROUND Non-fatal overdoses represent a significant morbidity for regular heroin users. Naltrexone is an opioid antagonist capable of blocking the effects of heroin, thereby preventing accidental overdose. However, treatment with oral naltrexone is often associated with non-compliance. An alternative is the use of a sustained release preparation of naltrexone. The aim of this study was to assess the change in number of opioid and other drug overdoses in a large cohort of heroin dependent persons (n=361; 218 males) before and after treatment with a sustained release naltrexone implant. A sub-group of this cohort (n=146; 83 males) had previously received treatment with oral naltrexone, which also allowed a comparison of overdoses pre- and post-oral and also post-implant treatments. METHOD We used a pre-post design, with data prospectively collected via the West Australian Health Services Research Linked Database, and the Emergency Department Information System. Participants were treated under the Australian Therapeutic Goods Administration's special access guidelines. RESULTS Most (336, 93%) of the cohort was in one or both databases. We identified 21 opioid overdoses involving 20 persons in the 6 months pre-treatment that required emergency department presentation or hospital admission: none were observed in the 6 months post-treatment. This is consistent with the existing pharmacokinetic data on this implant, which indicates maintenance of blood naltrexone levels at or above 2 ng/ml for approximately 6 months. A reduced number of opioid overdoses were also observed 7-12 months post-implant. The study found a significant increase in sedative "overdoses", some of which occurred in the 10 days following implant treatment and were likely associated with opioid withdrawal and/or implant treatment. For those previously treated with oral naltrexone, more opioid overdoses occurred in both the 6-months prior to and after oral compared to the 6-months post-implant treatment. CONCLUSIONS The findings support the clinical efficacy of this sustained release naltrexone implant in preventing opioid overdose. However, given the high prevalence of poly-substance use among dependent heroin users, programs offering this type of treatment should also focus on preventing, detecting and managing poly-substance use.
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Affiliation(s)
- Gary K. Hulse
- School of Psychiatry & Clinical Neurosciences, University of Western Australia, QE II Medical Centre, Nedlands, WA 6009, Australia
| | - Robert J. Tait
- School of Psychiatry & Clinical Neurosciences, University of Western Australia, QE II Medical Centre, Nedlands, WA 6009, Australia
| | - Sandra D. Comer
- School of Psychiatry & Clinical Neurosciences, University of Western Australia, QE II Medical Centre, Nedlands, WA 6009, Australia
- Division on Substance Abuse, Department of Psychiatry, Columbia University, New York, NY, 10032, USA
| | - Maria A. Sullivan
- School of Psychiatry & Clinical Neurosciences, University of Western Australia, QE II Medical Centre, Nedlands, WA 6009, Australia
- Division on Substance Abuse, Department of Psychiatry, Columbia University, New York, NY, 10032, USA
| | - Ian G. Jacobs
- Emergency Care Hospitalisation & Outcome Study, Emergency Medicine, University of Western Australia, QE II Medical Centre, Nedlands, WA 6009, Australia
| | - Diane Arnold-Reed
- School of Psychiatry & Clinical Neurosciences, University of Western Australia, QE II Medical Centre, Nedlands, WA 6009, Australia
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Byrne A, Graham G, Hallinan R, Murnion B. Naltrexone implants as treatment for heroin dependence: part I. Addict Biol 2005; 10:201; author reply 201-2. [PMID: 16191674 DOI: 10.1080/13556210500155789] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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