
Am J Psychiatry 156:1686-1696, November 1999
© 1999 American Psychiatric Association
Antipsychotic-Induced Weight Gain: A Comprehensive Research Synthesis
David B. Allison, Ph.D.,
Janet L. Mentore, M.S.Ed.,
Moonseong Heo, Ph.D.,
Linda P. Chandler, Ph.D.,
Joseph C. Cappelleri, Ph.D., M.P.H.,
Ming C. Infante, M.S., and
Peter J. Weiden, M.D.
OBJECTIVE: The purpose of this study was to estimate and compare the effects of antipsychoticsboth the newer ones and the conventional oneson body weight. METHOD: A comprehensive literature search identified 81 English- and non-English-language articles that included data on weight change in antipsychotic-treated patients. For each agent, a meta-analysis and random effects metaregression estimated the weight change after 10 weeks of treatment at a standard dose. A comprehensive narrative review was also conducted on all articles that did not yield quantitative information but did yield important qualitative information. RESULTS: Placebo was associated with a mean weight reduction of 0.74 kg. Among conventional agents, mean weight change ranged from a reduction of 0.39 kg with molindone to an increase of 3.19 kg with thioridazine. Among newer antipsychotic agents, mean increases were as follows: clozapine, 4.45 kg; olanzapine, 4.15 kg; sertindole, 2.92 kg; risperidone, 2.10 kg; and ziprasidone, 0.04 kg. Insufficient data were available to evaluate quetiapine at 10 weeks. CONCLUSIONS: Both conventional and newer antipsychotics are associated with weight gain. Among the newer agents, clozapine appears to have the greatest potential to induce weight gain, and ziprasidone the least. The differences among newer agents may affect compliance with medication and health risk.
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