noun Pharmacology.
a nonaddictive substance, C 2 0 H 2 3 NO 4 , used in the treatment of heroin addiction and opiate overdose.

1970–75; by rearrangement of parts of its chemical name Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
naltrexone (nælˈtrɛksəʊn)
a narcotic antagonist, similar to morphine, used chiefly in the treatment of heroin addiction
[C20: from N-al(lylnor)ox(ymorph)one, + the arbitrary insertion of -trex-]

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

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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Example sentences
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
Some medications, including naltrexone, may also help reduce symptoms related
  to this condition.
Naltrexone for the management of alcohol dependence.
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