An Integrated Analysis of Olanzapine/Fluoxetine Combination in Clinical Trials of Treatment-Resistant Depression

Article AbstractObjective: To evaluate the efficacy of olanzapine/fluoxetine combination (OFC) versus olanzapine or fluoxetine monotherapy across all clinical trials of treatment-resistant depression sponsored by Eli Lilly and Company. Method: Efficacy and safety data from 1146 patients with a history of nonresponse during the current depressive episode who subsequently exhibited nonresponse during a 6- to 8-week antidepressant open-label lead-in phase and were randomly assigned to OFC (N = 462), fluoxetine (N = 342), or olanzapine (N = 342) for double-blind treatment were analyzed. All patients had a diagnosis of major depressive disorder as defined by DSM-III or DSM-IV criteria. The dates in which the trials were conducted ranged from May 1997 to July 2005. Results: After 8 weeks, OFC patients demonstrated significantly greater Montgomery-Asberg Depression Rating Scale improvement (mean change = -13.0) than fluoxetine (-8.6, p Conclusion: Results of this analysis showed that OFC-treated patients experienced significantly improved depressive symptoms compared with olanzapine- or fluoxetine-treated patients following failure of 2 or more antidepressants within the current depressive episode. Safety results for OFC were generally consistent with those for its component monotherapies. The total cholesterol increase associated with OFC was more pronounced than with olanzapine alone. Depression