cimetidine

noun

1. (countable, uncountable)A histamine H₂-receptor antagonist that inhibits the production of acid in the stomach, mainly used to treat heartburn and peptic ulcers, but notorious for causing male impotence. It is a histamine analog, a sulfur-containing derivative of imidazole.

   “Until Tagamet (cimetidine), most major drug companies didn't take tummy troubles terribly seriously.”