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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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truth serum 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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