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Clozapine and weight gain

D S Umbricht1, S Pollack, J M Kane

  • 1Hillside Hospital, Psychiatry Research Department, Glen Oaks, N.Y. 11004.

The Journal of Clinical Psychiatry
|September 1, 1994
PubMed
Summary
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Clozapine treatment in schizophrenia patients frequently causes significant weight gain, often exceeding 50% incidence, which may pose long-term health risks. This weight gain is not linked to treatment response.

Area of Science:

  • Psychiatry
  • Pharmacology
  • Metabolic Health

Background:

  • Clozapine is an atypical antipsychotic used for treatment-resistant schizophrenia.
  • Weight gain is a known side effect of clozapine, but its extent and long-term implications require further investigation.

Purpose of the Study:

  • To examine the association between clozapine treatment and weight gain in patients with chronic schizophrenia.
  • To assess short- and long-term weight changes, their correlation with treatment response, and risk factors for weight gain.

Main Methods:

  • Retrospective chart review of weight data from 82 patients with chronic schizophrenia.
  • Clozapine dosage titration (500-600 mg/day) over 3-5 weeks.
  • Psychopathology assessed using the Brief Psychiatric Rating Scale and Clinical Global Impressions scale.

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Main Results:

  • Clinically significant weight gain occurred primarily within the first 6-12 months, continuing into the third year.
  • Over 50% of patients became substantially overweight.
  • Weight gain did not correlate with treatment response; early weight gain was not predictive of response.
  • Baseline underweight status correlated with maximum weight gain, while baseline overweight status correlated with percentage above ideal weight.

Conclusions:

  • Clozapine treatment is associated with a high incidence of substantial weight gain, presenting a potential long-term health risk.
  • Further research is needed to understand the mechanisms of clozapine-induced weight gain and develop effective treatments for this adverse effect.