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  • Title: A randomized, double-blind comparison of olanzapine/fluoxetine combination, olanzapine, and fluoxetine in treatment-resistant major depressive disorder.
    Author: Thase ME, Corya SA, Osuntokun O, Case M, Henley DB, Sanger TM, Watson SB, Dubé S.
    Journal: J Clin Psychiatry; 2007 Feb; 68(2):224-36. PubMed ID: 17335320.
    Abstract:
    OBJECTIVE: Two parallel, 8-week double-blind studies compared olanzapine/fluoxetine combination, olanzapine, and fluoxetine in outpatients with treatment-resistant depression (TRD). METHOD: Treatment-resistant depression was defined as a documented history of current-episode antidepressant failure plus a prospective failure on fluoxetine. Following an 8-week fluoxetine lead-in, 605 nonresponders with DSM-IV major depressive disorder were randomly assigned to olanzapine/fluoxetine combination, olanzapine, or fluoxetine. The primary outcome measure was baseline-to-endpoint mean change on the Montgomery-Asberg Depression Rating Scale (MADRS). The study was conducted from April 2002 to May 2005. RESULTS: After 8 weeks of double-blind treatment, Study 1 revealed no statistically significant therapy differences in MADRS mean change (olanzapine/fluoxetine combination: -11.0, fluoxetine: -9.4, olanzapine: -10.5). In Study 2, olanzapine/fluoxetine combination demonstrated significantly greater MADRS improvement (-14.5) than fluoxetine (-8.6, p < .001) and olanzapine (-7.0, p < .001). Pooled study results revealed significant differences for olanzapine/ fluoxetine combination (-12.7) versus fluoxetine (-9.0, p < .001) and olanzapine (-8.8, p < .001). Pooled remission rates were 27% for olanzapine/ fluoxetine combination, 17% for fluoxetine, and 15% for olanzapine. Adverse events were consistent with previous studies. Cholesterol mean change (mg/dL) was +15.1 for olanzapine/ fluoxetine combination, +0.8 for fluoxetine, and +2.7 for olanzapine. Mean weight change (kg) was +4.9 for olanzapine/fluoxetine combination, +0.4 for fluoxetine, and +5.5 for olanzapine. Nonfasting glucose mean change (mg/dL) was +11.4 for olanzapine/fluoxetine combination, +4.9 for fluoxetine, and +9.9 for olanzapine. CONCLUSION: Patients with TRD (defined as treatment failure on 2 antidepressants) taking olanzapine/fluoxetine combination demonstrated significantly greater improvement in depressive symptoms than patients taking olanzapine or fluoxetine in 1 of 2 studies and in the pooled analysis. When considered within the context of all available evidence, olanzapine/fluoxetine combination is an efficacious therapy for patients with TRD. CLINICAL TRIALS REGISTRATION: ClinicalTrials.gov identifier: NCT00035321.
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