metoclopramide

(pharmacology) A procainamide derivative that is a dopamine D₂-receptor antagonist, given (usually as the hydrochloride) orally or by injection as an antiemetic and stimulant of gastrointestinal motility; 4-amino-5-chloro-N-(2-diethylaminoethyl)-2-methoxybenzamide, C₁₄H₂₂ClN₃O₂.