Options for pharmacological management of obesity in patients treated with atypical antipsychoticsWerneke, U.a; Taylor, D.a; Sanders, T.A.B.bInternational Clinical Psychopharmacology: July 2002 - Volume 17 - Issue 4 - pp 145-160 Research Papers Abstract Author Information Obesity is associated with considerable morbidity and decreased life expectancy. Weight gain is a commonly encountered problem associated with antipsychotic treatment. We reviewed the literature regarding the mechanisms of weight gain in response to these agents and eight substances implicated as potential obesity prevention or treatment: orlistat, sibutramine, fluoxetine, topiramate, amantadine, nizatidine and cimetidine, and metformin. Weight gain in response to antipsychotic treatment may be mediated through serotonergic, dopaminergic, adrenergic, cholinergic, histaminergic and glutaminergic receptors. Sex hormone dysregulation and altered insulin sensitivity have also been implicated. Two compounds, orlistat and sibutramine, have been shown to help prevent weight gain following a hypocaloric diet, but orlistat requires compliance with a fat-reduced diet, and sibutramine is unsuitable for patients taking serotonergic agents. The weight reducing effect of fluoxetine, even in conjunction with a hypocaloric diet, is only transient. Topiramate, amantadine and metformin may have adverse side-effects potentially outweighing the weight reducing potential. The effectiveness of cimetidine and nizatedine remains unclear. The hazards of these agents in a psychiatric population are discussed. It is concluded that the current evidence does not support the general use of pharmacological interventions for overweight patients treated with antipsychotic medication, although individually selected patients may benefit. aPharmacy Department, Maudsley Hospital, London bDepartment of Nutrition and Dietetics, King's College, London, UK Correspondence to David Taylor, Pharmacy Department, Maudsley Hospital, Denmark Hill, London SE5 8AZ, UK e-mail: firstname.lastname@example.org Received 12 November 2001 accepted 23 April 2002 © 2002 Lippincott Williams & Wilkins, Inc.