Possessing the ability to alter mood, anxiety, behavior, cognitive processes, or mental tension; usually applied to pharmacologic agents.
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psy·cho·ac·tive .sī-kō-'ak-tiv adj affecting the mind or behavior <\psychoactive drugs> <THC is the principal \psychoactive ingredient in marijuana>
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psy·cho·ac·tive (si″ko-akґtiv) psychotropic.Medical dictionary. 2011.