affecting mental activity, behavior, or perception, as a mood-altering drug.
a psychotropic drug, as a tranquilizer, sedative, or antidepressant.

1945–50; psycho- + -tropic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
psychotropic (ˌsaɪkəʊˈtrɒpɪk)
another word for psychoactive

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1956, from psycho- + Gk. -tropos "turning," from trepein (see trope). Hence, what "turns" the mind.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

psychotropic psy·cho·tro·pic (sī'kə-trō'pĭk, -trŏp'ĭk)
Having an altering effect on perception or behavior. Used especially of a drug. n.
A psychotropic drug or other agent.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
But it is also responsible for the plant's psychotropic effects.
Several generations of psychotropic drugs have proven to be of little or no
  benefit, and may be doing considerable harm.
Examines ethnographic methods in the study of psychotropic drug use.
Thanks for the excellent article, shows genuine hopefulness without the manic
  enthusiasm the bedevils all psychotropic issues.
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