truth drug

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
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