promethazine

noun
pro·meth·a·zine | \ (ˈ)prō-ˈmeth-ə-ˌzēn \

Medical Definition of promethazine 

: a crystalline antihistamine drug derived from phenothiazine and used chiefly in the form of its hydrochloride C17H20N2S·HCl — see phenergan

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