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Related Experiment Videos

Olanzapine for schizophrenia.

L Duggan1, M Fenton, R M Dardennes

  • 1Developmental Disabilities Division, St Andrew's Hospital, Billing Rd, Northampton, Northamptonshire, UK, NN1 5DG. lornaduggan@yahoo.co.uk

The Cochrane Database of Systematic Reviews
|January 22, 2003
PubMed
Summary
This summary is machine-generated.

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Olanzapine may be effective for schizophrenia with fewer side effects than typical antipsychotics, but causes more weight gain. High dropout rates limit firm conclusions on its clinical effects.

Area of Science:

  • Psychiatry
  • Pharmacology
  • Clinical Trials

Background:

  • Olanzapine is an atypical antipsychotic known for efficacy without the extrapyramidal side effects of older typical antipsychotics.
  • Schizophrenia and schizophreniform psychoses are serious mental health conditions requiring effective treatment.

Purpose of the Study:

  • To evaluate the clinical effects and safety of olanzapine compared to placebo and other antipsychotic drugs.
  • To assess olanzapine's efficacy in treating schizophrenia and schizophreniform psychoses.

Main Methods:

  • Systematic review of randomized clinical trials comparing olanzapine to placebo or other antipsychotics.
  • Electronic database searches (Biological Abstracts, Cochrane Library, EMBASE, MEDLINE, PsycLIT) and manual reference searches.

Related Experiment Videos

  • Independent data extraction and calculation of relative risks, confidence intervals, and weighted mean differences.

    • Main Results:

    • High attrition rates in olanzapine trials complicate interpretation, though it showed superiority over placebo for clinical response and global mental state.
    • Olanzapine demonstrated comparable short-term efficacy to typical antipsychotics for 'no important clinical response' and favored olanzapine in PANSS scores.
    • Fewer extrapyramidal side effects were observed with olanzapine compared to haloperidol, but olanzapine was associated with significant weight gain.

    Conclusions:

    • High participant dropout rates in large trials hinder definitive conclusions on olanzapine's clinical effects.
    • Olanzapine may offer antipsychotic benefits with reduced extrapyramidal side effects compared to typical drugs, but at the cost of increased weight gain.
    • There is a need for large, long-term randomized trials to establish firm conclusions regarding olanzapine's efficacy and safety in schizophrenia treatment.