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naltrexone

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nal⋅trex⋅one

[nal-trek-sohn]
–noun Pharmacology.
a nonaddictive substance, C2 0H2 3NO4, used in the treatment of heroin addiction and opiate overdose.

Origin:
1970–75; by rearrangement of parts of its chemical name
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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nal·trex·one   (nāl-trěk'sōn)   
n.  A drug, C20H23NO4, used as an antagonist to narcotic drugs.

[Blend of nal(o)xone and tre- (probably alteration of tri-, after the three carbon atoms in the propyl group that distinguishes it from naloxone, of which it is a congener).]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: nal·trex·one
Pronunciation: nal-'trek-"sOn
Function: noun
: a synthetic opiate antagonist administered in the form of itshydrochloride C20H23NO4·HCl especially to maintain detoxified opiate addicts in a drug-free state
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

naltrexone nal·trex·one (nāl-trěk'sōn)
n.
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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