Overcoming barriers to effective management of tardive dyskinesia

An Evidence-Based Update on Anticholinergic Use for Drug-Induced Movement Disorders

Drug-induced movement disorders (DIMDs) are associated with use of dopamine receptor blocking agents (DRBAs), including antipsychotics. The most common forms are drug-induced parkinsonism (DIP), dystonia, akathisia, and tardive dyskinesia (TD). Although rare, neuroleptic malignant syndrome (NMS) is a potentially life-threatening consequence of DRBA exposure. Recommendations for anticholinergic use in patients with DIMDs were developed on the basis of a roundtable discussion with healthcare professionals with extensive expertise in DIMD management, along with a comprehensive literature review. The roundtable agreed that "extrapyramidal symptoms" is a non-specific term that encompasses a range of abnormal movements. As such, it contributes to a misconception that all DIMDs can be treated in the same way, potentially leading to the misuse and overprescribing of anticholinergics. DIMDs are neurobiologically and clinically distinct, with different treatment paradigms and varying levels of evidence for anticholinergic use. Whereas evidence indicates anticholinergics can be effective for DIP and dystonia, they are not recommended for TD, akathisia, or NMS; nor are they supported for preventing DIMDs except in individuals at high risk for acute dystonia. Anticholinergics may induce serious peripheral adverse effects (e.g., urinary retention) and central effects (e.g., impaired cognition), all of which can be highly concerning especially in older adults. Appropriate use of anticholinergics therefore requires careful consideration of the evidence for efficacy (e.g., supportive for DIP but not TD) and the risks for serious adverse events. If used, anticholinergic medications should be prescribed at the lowest effective dose and for limited periods of time. When discontinued, they should be tapered gradually.

The Tardive Dyskinesia Impact Scale (TDIS), a novel patient-reported outcome measure in tardive dyskinesia: development and psychometric validation

BACKGROUND

Tardive dyskinesia (TD), a movement disorder in which patients experience abnormal involuntary movements, can have profound negative impacts on physical, cognitive, and psychosocial functioning. The Abnormal Involuntary Movement Scale (AIMS), a clinician-rated outcome, is considered the gold standard for evaluating treatment efficacy in TD clinical trials. However, it provides little information about the impacts of uncontrolled movements from a patient perspective and can be cumbersome to administer in clinical settings. The Tardive Dyskinesia Impact Scale (TDIS) was developed as a patient-reported outcome measure to fulfill the need for a disease-specific impact assessment in TD. The objective of the present study was to develop and evaluate the psychometric properties of the TDIS to determine whether it is fit-for-purpose to measure TD impact.

METHODS

Data from qualitative studies and phase 3 trials of a VMAT2 inhibitor for the treatment of TD (KINECT3 and KINECT4) were used to determine the psychometric properties of the TDIS. Qualitative research included concept elicitation and cognitive debriefing interviews with TD patients and their caregivers in order to assess how well the TDIS captured key domains of TD impact. Quantitative analyses to examine the psychometric properties of the TDIS included assessing construct validity (factor structure, known groups, and predictive validity) and responsiveness to change.

RESULTS

Qualitative results showed that the TDIS captures the key TD impacts reported by patients and caregivers and that the TDIS was interpreted as intended and relevant to patients' experiences. Quantitative results found evidence of 2 underlying domains of the TDIS: physical and socioemotional (Comparative Fit Index > 0.9). Known groups and predictive validity indicated that, compared with the AIMS, the TDIS captures unique content (correlation between AIMS and TDIS = 0.2-0.28). The TDIS showed responsiveness to change in treatment, with TDIS scores improving over 48 weeks in the 2 phase 3 trials.

CONCLUSIONS

The TDIS captures relevant information about the impact of TD and is easily administered in a clinician's office or patient's home. It may be used longitudinally to show changes in TD burden over time. The TDIS complements the AIMS; using these assessments together provides a more holistic assessment of TD.

Vesicular monoamine transporter (VMAT) regional expression and roles in pathological conditions

Vesicular monoamine transporters (VMATs) are key regulators of neurotransmitter release responsible for controlling numerous physiological, cognitive, emotional, and behavioral functions. They represent important therapeutic targets for numerous pathological conditions. There are two isoforms of VMAT transporter proteins that function as secondary active transporters into the vesicle for storage and release via exocytosis: VMAT1 (SLC18A1) and VMAT2 (SLC18A2) which differ in their function, quantity, and regional expression. VMAT2 has gained considerable interest as a therapeutic target and diagnostic marker. Inhibitors of VMAT2 have been used as an effective therapy for a range of pathological conditions. Additionally, the functionality and phenotypic classification of classical and nonclassical catecholaminergic neurons are identified by the presence of VMAT2 in catecholaminergic neurons. Dysregulation of VMAT2 is also implicated in many neuropsychiatric diseases. Despite the complex role of VMAT2, many aspects of its function remain unclear. Therefore, our aim is to expand our knowledge of the role of VMAT with a special focus on VMAT2 in different systems and cellular pathways which may potentially facilitate development of novel, more specific therapeutic targets. The current review provides a summary demonstrating the mechanism of action of VMAT, its functional role, and its contribution to disease progression and utilization as therapeutic targets.

Valbenazine for tardive dyskinesia: a systematic review and network meta-analysis

To date, the role of valbenazine (VAL) in a dose-dependent increase in efficacy for tardive dyskinesia (TD) and in the worsening of acceptability and tolerability in a dose-dependent manner remains to be elucidated. Thus, in this systematic review and frequentist network meta-analysis, we compared 16 outcomes of VAL80 mg/d (VAL80) with VAL40 mg/d (VAL40) related to the efficacy, acceptability, tolerability, and safety in the treatment of patients with TD. Using a 95% confidence interval, we calculated the standardized mean difference for continuous variables and the risk ratio for dichotomous variables. Our results demonstrated that both VAL80 and VAL40 were superior to the placebo in terms of Abnormal Involuntary Movement Scale (AIMS) total score, Clinical Global Impression of Change-TD, and response to treatment, but VAL80 outperformed VAL40 in terms of AIMS score and response to treatment. However, any active therapy and placebo treatment groups did not have significant differences in acceptability, tolerability, and safety outcomes and similarly between VAL80 and VAL40 in any other outcomes. In conclusions, VAL could be increased from VAL40 to VAL80 if a patient with TD adequately tolerates VAL40 but treatment response is poor.

Exploring real-world symptom impact and improvement in well-being domains for tardive dyskinesia in VMAT2 inhibitor-treated patients via clinician survey and chart review

Introduction

Two vesicular monoamine transporter 2 (VMAT2) inhibitors are approved in the United States (US) for the treatment of tardive dyskinesia (TD). There is a paucity of information on the impact of VMAT2 inhibitor treatment on patient social and physical well-being. The study objective was to elucidate clinician-reported improvement in symptoms and any noticeable changes in social or physical well-being in patients receiving VMAT2 inhibitors.

Methods

A web-based survey was offered to physicians, nurse practitioners, and physician assistants based in the US who prescribed valbenazine for TD within the past 24 months. Clinicians reported data from the charts of patients who met the inclusion criteria and were allowed to recall missing information.

Results

Respondents included 163 clinicians who reviewed charts of 601 VMAT2-treated patients with TD: 47% had TD symptoms in ≥2 body regions, with the most common being in the head or face and upper extremities. Prior to treatment, 93% of patients showed impairment in ≥1 social domain, and 88% were impaired in ≥1 physical domain. Following treatment, among those with improvement in TD symptoms (n = 540), 80% to 95% showed improvement in social domains, 90% to 95% showed improvement in physical domains, and 73% showed improvement in their primary psychiatric condition.

Discussion

In VMAT2-treated patients with TD symptom improvement, clinicians reported concomitant improvement in psychiatric disorder symptoms and in social and physical well-being. Regular assessment of TD impact on these types of domains should occur simultaneously with movement disorder ratings when evaluating the value of VMAT2 inhibitor therapy.

Tardive sensory syndrome related to lurasidone: A case report

BACKGROUND

Tardive sensory syndrome (TSS) is a subtype of tardive syndrome (TS), and its etiology is still uncertain. Lurasidone is an atypical antipsychotic that has high affinity for dopamine D2- and serotonergic 5HT2A- and 5-HT7-receptors.

CASE SUMMARY

A 52-year-old woman, previously diagnosed with schizophrenia, and with no history of movement disorders and no sensory paresthesia, had taken lurasidone, initiate dose 40 mg daily then up titration to 120 mg daily, since March 2021, and developed mandibular sensory (pain) paresthesia after 3 mo of administration. After switching from lurasidone to quetiapine, she reported obvious impr-ovement in her mandibular pain.

CONCLUSION

It is noteworthy that TSS is a rare subtype of TS, and lurasidone, an atypical antipsychotic, usually has a lower risk of causing TS. In light of the temporal relationship, it is therefore concluded that use of lurasidone might have caused TSS in this patient. We reported this rare case as a reminder that clinicians should adopt a cautious approach when prescribing atypical antipsychotics, so as to prevent TS.

Risperidone induced tardive movements in an elderly male-a case of cognitive decline masked by behavioral abnormalities

Tardive dyskinesia is a drug emergent side effect associated with long-term exposure to neuroleptics. Risperidone has lesser propensity to cause tardive movements. A 67-year-old male presented with tardive symptoms. He had oromasticatory and limb movements. He was started on 2 mg of risperidone for agitation and behavioral disturbance 4 years ago. He also developed cognitive decline over the years. Clinician must be aware of the possibility of tardive movements with risperidone and the need for frequent evaluation of cognitive function in any elderly male.

Tardive Dyskinesia Following Low-Dose Risperidone

Tardive dyskinesia is an involuntary athetoid or choreiform movement lasting a minimum of a few weeks. It is associated with the use of neuroleptic medication for at least three months and persists beyond four to eight weeks. Tardive dyskinesia usually occurs as a result of the long-term use of dopamine receptor-blocking agents, mainly first-generation antipsychotics or a high-dose, second-generation antipsychotic. We present a case of a 28-year-old female with osteogenesis imperfecta presented later with major depressive disorder with psychotic features. She was given a low-dose second-generation antipsychotic, namely, risperidone (2 mg) for psychosis for a cumulative duration of three months. As a result, she developed extrapyramidal symptoms in the form of akathisia, axial dystonia, involuntary movement of the right hand, and smacking movement of the lips. Symptoms persisted for more than eight weeks despite discontinuing risperidone and switching to quetiapine. After the exclusion of other differential diagnoses, she was labeled as a case of tardive dyskinesia. More studies are needed to assess whether undiscovered contributing factors to tardive dyskinesia exist and to understand how second-generation antipsychotics (SGAs) contribute to the development of tardive dyskinesia.

A new era in the diagnosis and treatment of tardive dyskinesia

Tardive dyskinesia (TD) is a heterogeneous, hyperkinetic movement disorder induced by dopamine-receptor blocking agents that presents a unique challenge in the treatment of psychosis. Although acceptance of TD as a serious consequence of antipsychotic treatment was resisted initially, subsequent research by many investigators in psychopharmacology contributed to a rich store of knowledge on many aspects of the disorder. While basic neuroscience investigations continue to deepen our understanding of underlying motor circuitry, past trials of potential treatments of TD focusing on a range of theoretical targets were often inconclusive. Development of newer antipsychotics promised to reduce the risk of TD compared to older drugs, but their improved tolerability unexpectedly enabled an expanding market that paradoxically both increased the absolute number of patients at risk and diminished attention to TD which was relegated to legacy status. Fortunately, development and approval of novel vesicular monoamine transporter inhibitors offered evidence-based symptomatic treatment of TD for the first time and rekindled interest in the disorder. Despite recent progress, many questions remain for future research including the mechanisms underlying TD, genetic predisposition, phenomenological diversity, whether new cases are reversible, how to implement best practices to prevent and treat TD, and whether the development of novel antipsychotics free of the risk of TD is attainable. We owe our patients the aspirational goal of striving for zero prevalence of persistent symptoms of TD in anyone treated for psychosis.

Impact of drug-induced Parkinsonism and tardive dyskinesia on health-related quality of life in schizophrenia

BACKGROUND

Both drug-induced Parkinsonism (DIP) and tardive dyskinesia (TD) have been shown to be associated with lower health-related quality of life (HRQOL) in schizophrenia, but few studies have examined their relative impact.

AIMS

This study aimed to examine and compare the association of DIP and TD with HRQOL in schizophrenia.

METHODS

In total, 903 patients with schizophrenia were assessed on the Positive and Negative Syndrome Scale (PANSS), Simpson-Angus Scale (SAS), and Abnormal Involuntary Movement Scale (AIMS). EuroQoL five-dimensional (EQ-5D-5L) utility scores were derived from PANSS scores via a previously validated algorithm and used as a measure of HRQOL.

RESULTS

In total, 160 (17.7%) participants had only DIP, 119 (13.2%) had only TD, and 123 (13.6%) had both DIP and TD. HRQOL was lowest for participants with both DIP and TD, followed by only DIP group, only TD group, and highest in the group with neither condition. HRQOL scores differed significantly between the four groups, F(3, 892) = 13.724, p < 0.001, ηp2 = 0.044). HRQOL of participants having only DIP or both DIP and TD was significantly lower than those having neither condition. There was no significant interaction between the presence of DIP and TD on the association with HRQOL.

CONCLUSIONS

DIP was the main antipsychotic-induced movement disorder associated with a poorer HRQOL in patients with schizophrenia. Therefore, clinicians should focus on prevention, detection, and effective management of DIP to optimize HRQOL in patients with schizophrenia.

Pathophysiology, prognosis and treatment of tardive dyskinesia

Tardive dyskinesia (TD), a movement disorder associated with antipsychotics, most frequently affects the lower face and jaw muscles, but can also affect walking, breathing and use of the hands and limbs. Knowledge of TD among physicians may be limited, and the pathophysiology of TD is poorly understood. We conducted this review to summarise the current knowledge surrounding the pathophysiology of TD and present recommendations for prevention and treatment based on a literature search and roundtable discussion attended by psychiatrists in Japan. It has been suggested that dopamine hypersensitivity, damaged gamma-aminobutyric acidergic neurons and/or increased production of reactive oxygen species may contribute to development of TD. Symptoms can profoundly affect everyday life; patients who develop TD have poorer prognoses, worse health-related quality of life, greater social withdrawal and higher mortality than patients without TD. Traditional treatment options include dietary supplements, although evidence for their effectiveness is low. Among pharmaceutical interventions, there is moderate evidence that switching to the second-generation antipsychotic clozapine, which has a lower affinity for dopamine D₂ receptors than other antipsychotics, may improve symptoms. Vesicular monoamine transporter 2 (VMAT-2) inhibitors, which oppose the increased dopaminergic activity associated with prolonged antipsychotic use by interfering with dopamine uptake and storage, have the strongest evidence for efficacy. VMAT-2 inhibitors are approved in the United States for the treatment of TD, and the first VMAT-2 inhibitor was approved in Japan for this indication in March 2022. Most guidelines recommend treating TD by first reducing the dose of antipsychotics or switching to clozapine or other second-generation antipsychotics, which have a lower association with TD than first-generation antipsychotics. We recommend focusing on prevention and monitoring for TD when prescribing antipsychotics, given that TD is often irreversible. Physicians should treat with antipsychotics only when necessary and at the lowest effective dose, and frequently monitor for TD symptoms.

PLAIN LANGUAGE SUMMARY

Plain Language Summary (In Japanese).

VISUAL SUMMARY

Visual Summary (In Japanese).

Clinician Perceptions of the Negative Impact of Telehealth Services in the Management of Drug-Induced Movement Disorders and Opportunities for Quality Improvement: A 2021 Internet-Based Survey

PURPOSE

Tardive dyskinesia (TD) is a drug-induced movement disorder (DIMD) seen in patients taking dopamine-receptor blocking agents (DRBAs). Clinicians should regularly monitor patients with or at risk of developing DIMDs; however, telehealth visits during the COVID-19 pandemic presented several significant challenges related to screening and care of these patients. In this observational survey study, respondents compared in-person with video/telephone visits to determine the impact on the evaluation, diagnosis, and monitoring of patients with DIMDs.

METHODS

The online survey was conducted (May 14-June 21, 2021) with qualified clinicians who prescribed a vesicular monoamine transporter 2 inhibitor or benztropine for DIMDs in the past 6 months, spent ≤70% of their professional time in the clinic, and conducted telehealth visits with ≥15% of their patients between December 2020 and January 2021. The questionnaire probed clinicians about their ability to evaluate, diagnose and monitor (hereinafter referred to as manage) patients with DIMDs via telehealth.

RESULTS

Survey respondents included 277 clinicians from psychiatry (n = 168) and neurology (n = 109) practices. Certain signs and symptoms (visual cues) used for diagnosis of DIMDs were not observable through telehealth and evaluation was comparatively more difficult with phone visits than video visits. Patients without caregivers and lower-functioning patients were at higher risk of missed diagnosis of DIMDs and were also difficult to monitor via telehealth. Limited access to computers or telephones and patients living alone were among the top socioeconomic barriers limiting clinicians' ability to diagnose DIMDs. Patients without a regular caregiver were also more difficult for clinicians to evaluate and monitor adequately. Further, most clinicians received no training related to evaluation of DIMDs via telehealth or engaging caregivers as health care partners.

CONCLUSION

Our study highlights specific limitations and challenges and provides considerations to help clinicians better manage DIMDs in the context of telehealth services.

The Clinical and Economic Burden of Tardive Dyskinesia in Israel: Real-World Data Analysis

PURPOSE/BACKGROUND

Tardive dyskinesia (TD) is a hyperkinetic movement disorder caused by exposure to dopamine-receptor blockers. Data on TD burden in Israel are scarce. This analysis assesses the clinical and economic burden of TD in Israeli patients.

METHODS/PROCEDURES

This retrospective analysis used a national health plan database (Maccabi Healthcare Services), representing 25% of the Israeli population. The study included adults alive at index date with an International Classification of Diseases, Ninth Revision, Clinical Modification TD diagnosis before 2018 and more than or equal to 1-year enrollment before diagnosis. Tardive dyskinesia patients were matched to non-TD patients (1:3) by underlying psychiatric condition, birth year, and sex. Treatment patterns and 2018 annual health care resource utilization and costs were assessed.

FINDINGS/RESULTS

Of 454 TD patients alive between 2013 and 2018, 333 alive on January 1, 2018, were matched to 999 non-TD patients. At baseline, TD patients had lower socioeconomic status and higher proportion of chronic kidney disease and antipsychotic medication use; all analyses were adjusted accordingly. Tardive dyskinesia patients had significantly more visits to general physicians, neurologists, psychiatrists, physiotherapists, and emergency departments versus non-TD patients (all P < 0.05). Tardive dyskinesia patients also had significantly longer hospital stays than non-TD patients ( P = 0.003). Total healthcare and medication costs per patient were significantly higher in the TD versus non-TD population (US $11,079 vs US $7145, P = 0.018).

IMPLICATIONS/CONCLUSIONS

Israeli TD patients have higher clinical and economic burden than non-TD patients. Understanding real-world health care resource utilization and costs allows clinicians and decision makers to quantify TD burden and prioritize resources for TD patients' treatment.

Cariprazine and akathisia, restlessness, and extrapyramidal symptoms in patients with bipolar depression

BACKGROUND

Akathisia is a neuropsychiatric syndrome that is commonly related to the use of dopamine receptor antagonists/partial agonists. The characteristics of cariprazine-related akathisia, restlessness, and extrapyramidal symptoms (EPS) were investigated in patients with bipolar I depression.

METHODS

Akathisia-related data from 3 fixed-dose clinical studies of cariprazine 1.5 mg/d and 3 mg/d in bipolar depression were evaluated in pooled post hoc analyses. Outcomes related to treatment-emergent adverse events (TEAEs) included incidence, time to onset, time to resolution, severity, discontinuations, and rescue medication use.

RESULTS

The incidence of akathisia was 7.6% for overall cariprazine (1.5 mg/d=5.5%; 3 mg/d=9.6%) and 2.1% for placebo; acute EPS occurred in 4.5% of cariprazine-treated (1.5 mg/d=3.8%; 3 mg/d=5.1%) and 2.1% of placebo-treated patients. Findings were similar for restlessness. Most TEAEs were mild/moderate (>95%), occurred during the first 3 weeks of cariprazine initiation or dose increase, and resulted in few discontinuations (<3%); median time to resolution of an akathisia or EPS TEAE after the last dose of cariprazine was ~1 week. Rescue medication was used by <3% of patients to manage akathisia/EPS events.

LIMITATIONS

Post hoc analyses; no active comparator.

CONCLUSIONS

In patients with bipolar depression, the incidence of cariprazine-related akathisia was higher than acute EPS or restlessness, with lower cariprazine doses associated with lower incidences of events. Akathisia and EPS TEAEs occurred early in treatment and were mild/moderate in severity. Few patients with akathisia or acute EPS discontinued treatment. Cariprazine-related akathisia and EPS can be minimized with conservative dosing and titration strategies.

TRIAL REGISTRATION

ClinicalTrials.gov Identifiers: NCT01396447, NCT02670538, NCT02670551.

Assessment of the Impact of Tardive Dyskinesia in Clinical Practice: Consensus Panel Recommendations

PURPOSE

Tardive dyskinesia (TD) is a hyperkinetic movement disorder in which patients experience abnormal involuntary movements that can have profound negative impacts on physical, cognitive, and psychosocial functioning. Use of measures to assess the functional impact of TD in routine clinical practice is lacking. To address this gap, an advisory panel of experts in psychiatry and movement disorder neurology was convened to develop consensus recommendations on assessment of the impact of TD on patients' functioning that can be used in clinical practice.

METHODS

An advisory panel provided recommendations using an iterative process, beginning with a narrative literature review regarding current practices for assessing the impact of TD in clinical settings. A detailed summary was generated, and the advisory panel provided comments about the content and answered questions about assessing TD impact in clinical practice. The panelists' responses were discussed during a virtual meeting held on August 28, 2020. A second meeting on September 25, 2020, focused on developing and refining recommendations for assessment of the impact of TD in clinical practice. At the conclusion of the second meeting, general consensus was reached on all recommendation statements.

RESULTS

As part of routine clinical practice, it is imperative to assess the impact of TD on the patient's life to help guide treatment decisions. Key domains for assessing the overall impact of TD include social, physical, vocational, and psychological functioning and the impact of TD on the underlying psychiatric disorder. Assessment of TD impact should be performed at every patient visit. Impact assessments should include consultation with patients, caregivers, and family members. Shared decision-making to initiate TD treatment should consider impact.

CONCLUSION

The impact of TD should be assessed routinely, including the key domains of social, physical, vocational, and psychological functioning and the impact of TD on the underlying psychiatric disorder.

Tardive Dyskinesia in Older Persons Taking Antipsychotics

Tardive dyskinesia (TD) is a hyperkinetic movement disorder caused by the use of dopamine receptor-blocking agents (DRBAs), a category of medications that includes first- and second-generation antipsychotics (APs) and agents such as metoclopramide that are used for the treatment of nausea and gastrointestinal dysmotility. While TD can affect people of all ages, older age is associated with increased risk of TD and also with the emergence of TD occurring after shorter treatment durations and lower dosages of DRBAs. TD is characterized by involuntary movements that include the face, limbs, and trunk, and is associated with increased comorbidities, social stigmatization, and impaired physical and mental health. Once present, TD tends to persist despite AP dose adjustment or discontinuation. Even with the use of US Food and Drug Administration (FDA)-approved medications for TD, symptoms may persist. Because the leading hypothesis for the pathophysiology of TD has been dysregulation of dopamine transmission due to treatment with DRBAs, APs that avoid postsynaptic dopamine receptor blockade may provide an alternative therapeutic approach for patients who require an AP. In this review, we discuss the risks, burdens, prevention, and management of TD, with a focus on older people.

Recent Advances in the Pharmacology of Tardive Dyskinesia

Tardive dyskinesia (TD) is a syndrome of abnormal involuntary movements that follows treatment with dopamine D2-receptor antagonists. Recent approval of vesicular monoamine transporter-2 (VMAT2) inhibitors offers hope for reducing the impact of TD. Although these drugs represent a significant advance in patient care and a practical step forward in providing relief for patients with TD, understanding of the pharmacology of TD that could inform future research to prevent and reverse TD remains incomplete. This review surveys evidence for the effectiveness of VMAT2 inhibitors and other agents in the context of theories of pathogenesis of TD. In patients for whom VMAT2 inhibitors are ineffective or intolerable, as well as for extending therapeutic options and insights regarding underlying mechanisms, a review of clinical trial results examined as experimental tests of etiologic hypotheses is worthwhile. There are still compelling reasons for further investigations of the pharmacology of TD, which could generate alternative preventive and potentially curative treatments. Finally, benefits from novel drugs are best realized within an overall treatment strategy addressing the condition and needs of individual patients.

Drug-induced dyskinesias, can they be prevented?

Introduction: Dyskinesia is a symptom complex in the form of involuntary, repetitive movements of lips, lower jaw, tongue, less often the trunk and limbs. Despite the use of newer drugs in treatment neuroleptics, dyskinesia has not ceased to be a clinical problem.

Method: The work is based on a research review for which the Google Scholar database was used as well PubMed. The search range was limited to 2008-2020. We have included descriptive publications tardive dyskinesia only as a consequence of antipsychotic medications.

Material: We present the use of tetrabenazine analogues, deep brain stimulation, neuroleptics, benzodiazepines and botulinum toxin in late-suffering patients drug-induced dyskinesias, which may indicate an improvement in your health.

Discussion: The first method of treating tardive dyskinesia are withdrawal antipsychotic medications, but for many patients this is impossible. Valbenazine and Deep Brain Stimulation are the most effective in treating Tardive Dyskinesia.

Conclusions: There are not enough studies with the highest reliability to create unequivocal recommendations in the treatment of drug-induced tardive dyskinesia.

A Rational Use of Clozapine Based on Adverse Drug Reactions, Pharmacokinetics, and Clinical Pharmacopsychology

Using Richardson and Davidson's model and the sciences of pharmacokinetics and clinical pharmacopsychology, this article reviewed the: (1) poor life expectancy associated with treatment-resistant schizophrenia (TRS), which may be improved in patients who adhere to clozapine; (2) findings that clozapine is the best treatment for TRS (according to efficacy, effectiveness and well-being); and (3) potential for clozapine to cause vulnerabilities, including potentially lethal adverse drug reactions such as agranulocytosis, pneumonia, and myocarditis. Rational use requires: (1) modification of the clozapine package insert worldwide to include lower doses for Asians and to avoid the lethality associated with pneumonia, (2) the use of clozapine levels for personalizing dosing, and (3) the use of slow and personalized titration. This may make clozapine as safe as possible and contribute to increased life expectancy and well-being. In the absence of data on COVID-19 in clozapine patients, clozapine possibly impairs immunological mechanisms and may increase pneumonia risk in infected patients. Psychiatrists should call their clozapine patients and families and explain to them that if the patient develops fever or flu-like symptoms, the psychiatrist should be called and should consider halving the clozapine dose. If the patient is hospitalized with pneumonia, the treating physician needs to assess for symptoms of clozapine intoxication since halving the dose may not be enough for all patients; consider decreasing it to one-third or even stopping it. Once the signs of inflammation and fever have disappeared, the clozapine dose can be slowly increased to the prior dosage level.