Comparative efficacy of cognitive therapy and pharmacotherapy in the treatment of depressed outpatients

Abstract

Forty-one unipolar depressed outpatients were randomly assigned to individual treatment with either cognitive therapy (N =19)or imipramine (N =22). As a group, the patients had been intermittently or chronically depressed with a mean period of 8.8 years since the onset of their first episode of depression, and 75%were suicidal. For the cognitive therapy patients, the treatment protocol specified a maximum of 20 interviews over a period of 12 weeks. The pharmacotherapy patients received up to 250 mg/day of imipramine for a maximum of 12 weeks. Patients who completed cognitive therapy averaged 10.90 weeks in treatment; those in pharmacotherapy averaged 10.86 weeks. Both treatment groups showed statistically significant decreases in depressive symptomatology. Cognitive therapy resulted in significantly greater improvement than did pharmacotherapy on both a self-administered measure of depression (Beck Depression Inventory)and clinical ratings (Hamilton Rating Scale for Depression and Raskin Scale). Moreover, 78.9%of the patients in cognitive therapy showed marked improvement or complete remission of symptoms as compared to 22.7%of the pharmacotherapy patients. In addition, both treatment groups showed substantial decrease in anxiety ratings. The dropout rate was significantly higher with pharmacotherapy (8 S s)than with cognitive therapy (1 S). Even when these dropouts were excluded from data analysis, the cognitive therapy patients showed a significantly greater improvement than the pharmacotherapy patients. Follow-up contacts at three and six months indicate that treatment gains evident at termination were maintained over time. Moreover, while 68%of the pharmacotherapy group re-entered treatment for depression, only 16%of the psychotherapy patients did so. © 1977 Plenum Publishing Corp.