A phenothiazine derivative used as a sedative and analgesic, administered orally (as the maleate) or by injection (as the hydrochloride); 10-(3-dimethylamino-2-methylpropyl)-2-methoxyphenothiazine, C ₁₉ H ₂₄ N ₂ OS. [International Nonproprietary Name (1996): levomepromazine.].
1960s; earliest use found in The British Medical Journal. From metho- (in methoxy-) + trimeprazine.