Trazodone-oral cocaine interactions.

Depression and dysphoria can follow the long-term use of cocaine. Little is known about the interaction of antidepressant drugs with cocaine and similar stimulants in humans. The physiologic and subjective effects of an oral 2-mg/kg dose of cocaine hydrochloride were measured in eight healthy cocaine-using men after pretreatment with a single, 100-mg oral dose of the triazolopyridine antidepressant trazodone hydrochloride or placebo in a double-blind study. The cocaine-induced effects of increased BP, increased pupil size, and decreased skin temperature were diminished by trazodone pretreatment. Trazodone alone did not alter plasma epinephrine or norepinephrine levels. An increase in plasma epinephrine levels after cocaine administration was not altered by trazodone pretreatment, but the increase in the norepinephrine level was larger. Trazodone alone produced mild sleepiness. Cocaine-induced euphoria was not altered by trazodone pretreatment, although feelings of tension and shakiness after cocaine administration were diminished.