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1 Merck Institute for Therapeutic Research, Rahway, N. J.
N-allylnormorphine (nalorphine) possesses no more than slight analgesic effect as measured by reaction to thermal stimuli in animals.
Nalorphine is an effective antagonist against a wide variety of potent analgesics related pharmacologically to morphine, whether related chemically or not. It antagonizes many times its molecular equivalent of narcotics.
The antagonism is exhibited against a wide spectrum of biological effects of analgesic drugs. Nalorphine probably competes with these drugs at the sites of action.
Nalorphine exhibits very weak antispasmodic activity.
Submitted on February 2, 1954
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