10001633 J Clin Psychiatry / Document Archive

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The article you requested is

Long-Term Olanzapine Therapy in the Treatment of Bipolar I Disorder: An Open-Label Continuation Phase Study.

J Clin Psychiatry 2001;62:273-281
Copyright 2001 Physicians Postgraduate Press, Inc.

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Background: Olanzapine has demonstrated efficacy in the treatment of acute mania in 2 double-blind, placebo-controlled trials. We describe the results of the open-label extension from one of these trials.

Method: In a 3-week, double-blind study of patients with DSM-IV bipolar I disorder, olanzapine was superior to placebo for the treatment of acute manic symptoms. Of the 139 patients who entered the double-blind phase of the 3-week study, 113 patients continued into the 49-week open-label extension. Efficacy measurements including the Young Mania Rating Scale (YMRS), the 21-item Hamilton Rating Scale for Depression (HAM-D-21), the Clinical Global Impressions scale-Bipolar Version, and the Positive and Negative Syndrome Scale and safety measurements including the Simpson-Angus scale, the Barnes Akathisia Scale, and the Abnormal Involuntary Movement Scale were completed throughout. The analysis considered all treatment results, starting with the first olanzapine dose. Adjunctive lithium and fluoxetine were allowed during the open-label extension.

Results: The mean length of olanzapine treatment was 6.6 months, with a mean modal dose of 13.9 mg/day. A significant mean improvement in the YMRS total score, baseline to endpoint (-18.01, p < .001), was observed. During treatment, 88.3% of patients experienced a remission of manic symptoms (YMRS total score <= 12), and only 25.5% subsequently relapsed (YMRS total score >= 15). Significant improvement in HAM-D-21 scores was observed (p < .001). Forty-one percent of patients were maintained on olanzapine monotherapy. The most common treatment-emergent adverse events reported were somnolence (46.0%), depression (38.9%), and weight gain (36.3%).

Conclusion: During up to 1 year of olanzapine therapy, either as monotherapy or in combination with lithium and/or fluoxetine, patients with bipolar disorder demonstrated significant improvement in mania and depression symptoms with a favorable safety profile. Further double-blind, controlled studies are needed to confirm these results.