nalorphine
American Heritage Dictionary:
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nal·or·phine
(năl'ər-fēn', năl-ôr'fēn) 
n.
A drug, C19H21NO3, derived from morphine, used to treat respiratory depression and other effects of an overdose of narcotics.
n.
A drug, C19H21NO3, derived from morphine, used to treat respiratory depression and other effects of an overdose of narcotics.
[Short for N-allylnormorphine, its chemical name.]
nalorphine (năl'ərfēn), derivative of morphine that acts to reverse the effects of morphine and other narcotics. It counteracts narcotic-induced nervous system and respiratory system depression but is not effective against depression induced by other sedatives such as barbiturates. Nalorphine and other narcotic antagonists are useful in reversing the effects of narcotic overdoses. Because nalorphine causes withdrawal symptoms in addicts, it is administered to apparent ex-addicts to determine if they have returned to drug use. Nalorphine is marketed under the trade name Nalline.
American Heritage Stedman's Medical Dictionary:
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nal·or·phine
(năl'ər-fēn', năl-ôr'fēn)
n.
n.
A drug derived from morphine that acts as an antagonist to the depressant and stimulatory effects of morphine and related narcotics and is used to counteract respiratory depression produced by narcotic overdose.
Saunders Veterinary Dictionary:
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nalorphine
A semisynthetic congener of morphine used as the hydrochloride to antagonize morphine and related narcotics and as an analgesic.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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Columbia Encyclopedia
The Columbia Electronic Encyclopedia, Sixth Edition Copyright © 2012, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/.
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American Heritage Stedman's Medical Dictionary
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company.
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