The Dexamethasone Suppression Test and Response to Placebo

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Abstract
The predictive value of the dexamethasone suppression test (DST) was evaluated in two consecutive double-blind, placebo-controlled trials evaluating 61 depressed inpatients randomized to either one of two drugs, sertraline of oxaprotiline, or placebo over a 4-week clinical trial. For 30 patients who completed at least 3 weeks of double-blind treatment on either drug, the initial DST was not predictive of response to drug treatment. For the 17 patients who completed at least 3 weeks of double-blind treatment on placebo, the presence of a positive DST predicted a statistically significantly poorer response to placebo as opposed to a negative DST. These preliminary findings suggest that for depressed individuals who present with a positive DST, remission without active medication is less likely and somatic treatment should be considered.

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