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Related to nalorphine: naloxone
a semisynthetic congener of morphine, used as an antagonist to morphine and related narcotics and in the diagnosis of narcotic addiction.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
An early antagonist of most depressant and stimulatory effects of morphine and related narcotic analgesics; precipitates severe withdrawal symptoms in morphine addicts, and counteracts the respiratory depression produced by morphine and related compounds; when administered in the absence of narcotics, nalorphine has mildly analgesic and respiratory depressant effects in nonaddicts; superseded by naloxone hydrochoride.
Farlex Partner Medical Dictionary © Farlex 2012
nalorphineA morphine derivative which reversses the activity of morphine and other narcotics. See Opioids.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
nalorphineA narcotic antagonist drug so similar in structure to MORPHINE that it occupies morphine receptor sites on cell membranes and prevents morphine from acting. A small dose of the drug, given to a morphine addict, can induce withdrawal symptoms within a matter of minutes.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005