"A medicine or treatment believed to protect against, counteract the effects of, or expel from the body a noxious or toxic substance, especially a poison or venom; an antidote; (in later use) especially a remedy for snakebite", Early 17th cent.; earliest use found in John Woodall (1570–1643), surgeon. Alteration of alexipharmac, after e.g. diuretic, diuretic).[alexipharmic etymology, alexipharmic origin, 英语词源]