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psychotropic vs. psychoactive

psychotropic
[sahy-koh-troh-pik] / ˌsaɪ koʊˈtroʊ pɪk /

adjective

  1. affecting mental activity, behavior, or perception, as a mood-altering drug.

noun

  1. a psychotropic drug, as a tranquilizer, sedative, or antidepressant.

psychoactive
[sahy-koh-ak-tiv] / ˌsaɪ koʊˈæk tɪv /

adjective

  1. of or relating to a substance having a profound or significant effect on mental processes.

    a psychoactive drug.