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1 Department of Pharmacology, School of Medicine, University of Washington, Seattle, Washington
Of the drugs scopolamine, atropine, hexamethonium, reserpine, hydralazine, phenoxybenzamine and chlorpromazine, only phenoxybenzamine and chlorpromazine were effective as antagonists of the behavioral effects induced by LSD.
Surgical sympathectomy and adrenal demedullation did not affect the behavior pattern induced by LSD.
Reserpine did not prevent the behavioral changes induced by LSD, but caused the animals so treated to develop a catatonic-like state immediately the typical behavior pattern ceased.
It is concluded that chlorpromazine and phenoxybenzamine are effective through depression of central sympathetic control areas.
Submitted on December 21, 1961