[nal-er-feen, nal-awr-feen]
noun Pharmacology.
a white, crystalline, water-soluble powder, C 1 9 H 2 1 NO 3 , used to nullify respiratory depression due to narcotics and for the diagnosis of addiction to narcotics.

1950–55; N-al(lyln)or(mor)phine; see allyl, nor-, morphine Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

nalorphine nal·or·phine (nāl'ər-fēn', nāl-ôr'fēn)
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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Cyclazocine is a totally synthetic narcotic antagonist which is much more potent and longer acting than nalorphine.
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