Abstract
The effects of acute administration of 10 different antidepressant drugs were examined on the performance of a two-way conditioned avoidance response in rats. The antidepressant drugs impaired avoidance behavior by decreasing avoidance responding and increasing the number of escape failures. The order of effectiveness for increasing overall response latency at a common dose of 10 mg/kg was: desipramine, maprotiline, protriptyline, (+) oxaprotiline, nortriptyline, imipramine, amtiriptyline, (−) oxaprotiline, fluoxetine, and chlorimipramine. Avoidance behavior was impaired most by those antidepressant drugs that are also potent inhibitors of norepinephrine uptake.
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