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Continuation and maintenance treatment of major depression with the monoamine oxidase inhibitor phenelzine: a double-blind placebo-controlled discontinuation study.

Long-term treatment with antidepressant drugs has received little attention until recently. A study is reported comparing the effectiveness of maintenance treatment with phenelzine in responding major depression patients. If they responded initially to nonblind phenelzine treatment and sustained remission for 16 weeks, patients were randomized to 2-year double-blind treatment with phenelzine 60 mg/day, phenelzine 45 mg/day, or placebo. Both doses of phenelzine were significantly better than placebo in preventing relapse of depression. Phenelzine 45 mg/day may be an optimal maintenance dose for many patients.