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[nal-trek-sohn] /nælˈtrɛk soʊn/
noun, Pharmacology
a nonaddictive substance, C 2 0 H 2 3 NO 4 , used in the treatment of heroin addiction and opiate overdose.
Origin of naltrexone
1970-75; by rearrangement of parts of its chemical name Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for naltrexone
  • They then studied images of the rats' brains to see how naltrexone affected brain activity.
  • naltrexone works to mitigate the disease process by blocking the effects of dopamine.
  • Some medications, including naltrexone, may also help reduce symptoms related to this condition.
  • naltrexone for the management of alcohol dependence.
  • naltrexone is an opioid antagonist that is approved for the treatment of both opioid dependence and alcohol dependence.
  • Provides concise guidelines for primary health care providers on naltrexone therapy for alcoholism treatment.
  • Inadvertent injection of naltrexone suspension into fatty tissue may increase the likelihood of serious injection site reactions.
British Dictionary definitions for naltrexone


a narcotic antagonist, similar to morphine, used chiefly in the treatment of heroin addiction
Word Origin
C20: from N-al(lylnor)ox(ymorph)one, + the arbitrary insertion of -trex-
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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naltrexone in Medicine

naltrexone nal·trex·one (nāl-trěk'sōn)
An endorphin and narcotic antagonist. It is devoid of pharmacologic action when administered in the absence of narcotics.

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