Abstract
Excessive body weight gain (BWG), hyperglycemia and dyslipidemia are important side effects of olanzapine. We assessed the effects of rosiglitazone on BWG, the insulin resistance index (HOMA-IR), lipids, glycated hemoglobin and fibrinogen in olanzapine-treated schizophrenia patients. Thirty patients taking olanzapine (10-20 mg daily for 8 months) were randomly allocated to rosiglitazone (n=15; 4 to 8 mg daily) or placebo (n=15) in a 12-week double-blind protocol. Anthropometric and biochemical variables were evaluated at baseline, weeks 6 and 12. The rosiglitazone and placebo groups gained 3.2+/-4.5 and 2.2+/-2.3 kg, respectively (p=0.65). Insulin and the HOMA-IR significantly decreased after rosiglitazone (p<0.05). Rosiglitazone did not improve the lipid profile, fibrinogen and Hb1c levels. The positive impact of rosiglitazone was limited to improved glycemic control. It cannot be recommended for metabolic control during olanzapine treatment.
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