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truth serum

[trooth seer-uh m] /ˈtruθ ˌsɪər əm/
a drug, as the barbiturate thiopental, that induces in the subject a desire to talk or a state of heightened suggestibility, used in psychotherapy and in interrogation to discover repressed or consciously withheld information.
Often, truth drug [trooth druhg] /ˈtruθ ˌdrʌg/ (Show IPA).
Compare narcoanalysis.
Origin of truth serum
First recorded in 1920-25 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for truth drug

truth drug

(informal) any of various drugs supposed to have the property of making people tell the truth, as by relaxing them
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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truth drug in Medicine

truth serum n.
Any of various hypnotic or anesthetic drugs, such as scopolamine or thiopental sodium, used to induce a subject under questioning to talk without inhibition.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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