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1 Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut
In experiments in rats in which levallorphan, nalorphine and WIN 7681 were tested against the respiratory depressant action of levo-Dromoran, levomethadone, morphine, meperidine and alphaprodine, it was found that while all possessed some ability to restore depressed respiration to normal, levallorphan was the most active.
Some indications of specificity of action were observed, and these are discussed briefly.
Submitted on November 9, 1954