truth serum

noun
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.
Also, truth drug.
Compare narcoanalysis.


Origin:
1920–25

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Collins
World English Dictionary
truth drug or truth serum
 
n
informal any of various drugs supposed to have the property of making people tell the truth, as by relaxing them
 
truth serum or truth serum
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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Example sentences
But when the fitness tycoon starts gushing that she's no businesswoman, you may want to reach for the truth serum.
But although many different substances have been tested in the past, no magical truth serum has been identified.
His mission is to secure the secret recipe for a truth serum to use on enemy agents.
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