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1 Department of Pharmacology, University of Illinois College of Medicine, Chicago, Illinois
The time course of the interaction between decamethonium or succinylcholine and tubocurarine was determined by the rabbit head-drop cross-over technique. Decamethonium pretreatment decreases the amount of tubocurarine required to produce head-drop for more than 2 hours to an even greater extent than does pretreatment with tubocurarine itself; decamethonium is synergistic with a decamethonium pretreatment but for only 50 to 80 minutes.
Tachyphylaxis was observed with succinylcholine administered 20 to 80 minutes after a prior succinylcholine head-drop. Succinylcholine pretreatment decreased the head-drop dose of tubocurarine determined 10 minutes later. Tubocurarine, when administered 10 minutes prior to succinylcholine, decreased the head-drop dose of succinylcholine.
Submitted on October 10, 1958