
Am J Psychiatry 162:1535-1538, August 2005
© 2005 American Psychiatric Association
Six-Month, Blinded, Multicenter Continuation Study of Ziprasidone Versus Olanzapine in Schizophrenia
George M. Simpson, M.D.,
Peter Weiden, M.D.,
Theresa Pigott, M.D.,
Stephen Murray, M.D., Ph.D.,
Cynthia O. Siu, Ph.D., and
Steven J. Romano, M.D.
OBJECTIVE: The authors goal was to compare the efficacy and tolerability of 6 months treatment with flexible-dose ziprasidone and olanzapine in patients with schizophrenia or schizoaffective disorder. METHOD: Brief Psychiatric Rating Scale (BPRS) scores and Clinical Global Impression (CGI) severity scores were obtained for 126 responders to a 6-week acute study of olanzapine and ziprasidone during a blinded 6-month continuation study and optional extension study. RESULTS: Comparable improvements in BPRS and CGI severity scores were seen with both drugs. Olanzapine produced significant increases from acute-study baseline values in weight and body mass index and within-group increases in total cholesterol, low-density lipoprotein cholesterol, and fasting insulin. Between-group differences were not significant for lipids and insulin. Mean QTc values at endpoint were 407.1 msec (baseline mean=406.0 msec) and 394.4 msec (baseline mean=399.7 msec) for ziprasidone and olanzapine, respectively. No patient had a QTc interval 500 msec. CONCLUSIONS: Ziprasidone and olanzapine had comparable long-term efficacy; olanzapine was associated with significant weight gain and metabolic alterations.
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