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Randomized double blind comparison of olanzapine vs. clozapine on subjective well-being and clinical outcome in patients with schizophrenia.

Author(s): Naber D, Riedel M, Klimke A, Vorbach EU, Lambert M, Kuhn KU, Bender S, Bandelow B, Lemmer W, Moritz S, Dittmann RW

Affiliation(s): Department of Psychiatry and Psychotherapy, University Hospital Hamburg-Eppendorf, Germany. naber@uke.uni-hamburg.de

Publication date & source: 2005-02, Acta Psychiatr Scand., 111(2):106-15.

Publication type: Clinical Trial; Multicenter Study; Randomized Controlled Trial

OBJECTIVE: This randomized double-blind multicenter trial evaluated the effects of olanzapine vs. clozapine on subjective well-being, quality of life (QOL) and clinical outcome. METHOD: The primary objective was to demonstrate non-inferiority of olanzapine, mean dosage 16.2 +/- 4.8 (5-25 mg/day) vs. clozapine, mean dosage 209 +/- 91 (100-400 mg/day) regarding improvement on the 'Subjective Well-Being under Neuroleptic Treatment' (SWN) Scale after 26 treatment weeks in 114 patients with schizophrenia. Secondary outcome parameters included: Munich QOL Dimension List (MLDL), Positive and Negative Symptom Scale (PANSS), Clinical Global Impression (CGI). RESULTS: SWN scores improved significantly in both groups, olanzapine was non-inferior to clozapine (group difference 3.2 points in favor of olanzapine; 95% CI: 4.2;10.5). MLDL-satisfaction, PANSS and CGI-S improved similarly, olanzapine yielded a higher CGI Therapeutic Index. Individual SWN and PANSS changes correlated only moderately (r = -0.45). CONCLUSION: Olanzapine was non-inferior to clozapine. The lack of a marked correlation between PANSS and SWN improvements indicates that patients and psychiatrists perceive treatment differently.

Page last updated: 2006-01-31

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