nalorphine definition of nalorphine in the Free Online Encyclopedia.

nalorphine (năl`ərfēn), derivative of morphine morphine, principal derivative of opium , which is the juice in the unripe seed pods of the opium poppy , Papaver somniferum. It was first isolated from opium in 1803 by the German pharmacist F. W. A.
..... Click the link for more information. that acts to reverse the effects of morphine and other narcotics narcotic, any of a number of substances that have a depressant effect on the nervous system. The chief narcotic drugs are opium , its constituents morphine and codeine , and the morphine derivative heroin .

See also drug addiction and drug abuse .
..... Click the link for more information. . It counteracts narcotic-induced nervous system and respiratory system depression but is not effective against depression induced by other sedatives such as barbiturates barbiturate (bärbĭch`ərāt'), any one of a group of drugs that act as depressants on the central nervous system .
..... Click the link for more information. . 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.

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nalorphine