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  • Title: Efficacy and safety of long-term fluoxetine versus lithium monotherapy of bipolar II disorder: a randomized, double-blind, placebo-substitution study.
    Author: Amsterdam JD, Shults J.
    Journal: Am J Psychiatry; 2010 Jul; 167(7):792-800. PubMed ID: 20360317.
    Abstract:
    OBJECTIVE: The authors examined the safety and efficacy of long-term fluoxetine monotherapy, lithium monotherapy, and placebo therapy in preventing relapse and recurrence of bipolar type II major depressive episode. The authors hypothesized that fluoxetine monotherapy would be superior to lithium monotherapy with a similar hypomanic mood conversion rate. METHOD: Patients at least 18 years old who recovered from their major depressive episode during initial open-label fluoxetine monotherapy were randomly assigned to receive 50 weeks of double-blind monotherapy with fluoxetine at 10-40 mg/day, lithium at 300-1200 mg/day, or placebo. The primary outcome measure was time to relapse or recurrence. Secondary outcome measures included the proportion of patients remaining well and the frequency of hypomanic symptoms. RESULTS: There were no significant differences in clinical or demographic characteristics among the fluoxetine (N=28), lithium (N=26), and placebo (N=27) groups. The mean time to relapse was 249.9 days for the fluoxetine group, 156.4 days for the lithium group, and 186.9 days for the placebo group. The hazard of relapse was significantly lower with fluoxetine compared with lithium, and the estimated hazard of relapse with lithium was 2.5 times greater than with fluoxetine. There were no statistically significant or clinically meaningful differences in hypomanic symptoms among treatment groups over time. One patient taking fluoxetine and one patient taking placebo discontinued treatment because of hypomania. CONCLUSIONS: These findings suggest that long-term fluoxetine monotherapy may provide superior relapse-prevention benefit relative to lithium monotherapy after recovery from bipolar II major depressive episode without an increase in hypomanic mood conversion episodes.
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