pseu·do·ephed·rine -i-'fed-rən, Brit also -'ef-ə-drən n a crystalline alkaloid C10H15NO that is isomeric with ephedrine and is administered chiefly in the form of its hydrochloride C10H15NO·HCl or sulfate (C10H15NO)2·H2SO4 esp. to relieve nasal congestion
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pseu·do·ephed·rine (soo″do-ə-fedґrin) one of the stereoisomers of ephedrine, having less pressor action and fewer central stimulant effects than ephedrine.Medical dictionary. 2011.