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Related Concept Videos

Psychosis: Goals of Pharmacotherapy01:26

Psychosis: Goals of Pharmacotherapy

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Antipsychotic drugs are a crucial treatment method for acute and chronic psychoses, bipolar illness, and behavioral disorders. The selection of these drugs depends on several factors, including the state of the disease, clinical judgment, possible drug interactions, and the patient's sensitivity to adverse effects. In immediate scenarios, such as delirium and dementia, short-term treatment with low doses of high-potency typical or atypical agents can effectively manage symptom exacerbation.
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Drug Therapy01:28

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The advent of drug therapy has profoundly shaped modern mental health care, providing targeted treatments for a range of psychological disorders. Psychotherapeutic drugs, classified into antianxiety, antidepressant, and antipsychotic medications, address symptoms across anxiety disorders, mood disorders, and schizophrenia. While these medications have transformed patient outcomes, they require careful management due to their potential side effects and limitations.
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The term "psychosis" refers to a spectrum of mental disorders characterized by abnormal thoughts, perceptions, and behaviors. It can manifest as mood disorders, dementia, delirium with psychotic features, substance-induced psychosis with psychotic features, brief psychotic disorder, delusional disorder, schizoaffective disorder, and schizophrenia. Among all these disorders, schizophrenia is the most common psychotic disorder, affecting 1% of the worldwide population. Psychotic...
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The elimination half-life and drug clearance of drugs following nonlinear kinetics can vary with dosage. The Michaelis-Menten parameters and drug concentration influence these factors. As the dose increases, the elimination half-life tends to lengthen, resulting in a reduction in clearance and a disproportionately larger area under the curve. The total clearance can be derived from the Michaelis-Menten equation for drugs following a one-compartment model.
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Antipsychotic drugs are classified into first-generation (typical) drugs including phenothiazines; and second-generation (atypical) drugs. Chlorpromazine hydrochloride (Thorazine), a phenothiazine derivative, broadly impacts the central, autonomic, and endocrine systems. This drug, along with typical agents like haloperidol (Haldol), primarily works by antagonizing D2 receptors, thus reducing dopaminergic neurotransmission. However, typical antipsychotics can cause side effects such as sedation...
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In pediatric medicine, understanding the renal function and drug elimination nuances is crucial for administering safe and effective treatments. Newborns, in particular, display markedly slower renal functions than adults, profoundly affecting how drugs are cleared from their bodies. This slower drug clearance requires clinicians to extend the dosing intervals for many medications to prevent drug accumulation and toxicity while ensuring therapeutic efficacy.One key area where these adjustments...
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Delaying clozapine: how long is too long?

Tom Varghese M1,2, K S Jyothi1, K S Shaji1

  • 1Department of Psychiatry, Government Medical College Thrissur, Thrissur, Kerala, India.

General Psychiatry
|May 19, 2020
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Delaying clozapine treatment for schizophrenia is linked to worse outcomes. Early clozapine initiation is crucial for improving symptom scores in treatment-resistant schizophrenia patients.

Keywords:
psychopharmacologyschizophrenia

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Area of Science:

  • Psychiatry
  • Clinical Pharmacology
  • Schizophrenia Research

Background:

  • Clozapine is the most effective treatment for treatment-resistant schizophrenia (TRS).
  • Its clinical use in India is limited, leading to potential treatment delays.
  • The impact of delayed clozapine initiation on patient outcomes requires investigation.

Purpose of the Study:

  • To determine the clinical implications of delayed clozapine initiation in patients with TRS.
  • To assess the association between the timing of clozapine initiation and symptom severity.

Main Methods:

  • Retrospective cohort study of 40 patients with TRS stabilized on clozapine monotherapy.
  • Data collected on duration of illness, total treatment duration, and time to clozapine initiation.
  • Symptom severity assessed using the Positive and Negative Syndrome Scale (PANSS).
  • Statistical analyses included t-tests, correlation, and multiple linear regression.

Main Results:

  • The mean duration of antipsychotic treatment before clozapine initiation was 89.3 months (7.4 years).
  • Delayed clozapine initiation showed a significant positive association with total PANSS scores and negative symptom scores.
  • Duration of treatment prior to clozapine was an independent predictor of higher negative symptom scores (R²=0.27).

Conclusions:

  • Delayed initiation of clozapine therapy may contribute to poorer treatment outcomes in patients with TRS.
  • Earlier introduction of clozapine is recommended to improve clinical outcomes.
  • This highlights the need to address barriers to clozapine use in clinical practice.