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countable and uncountable, plural cimetidines
(pharmacology) 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. quotations
Until Tagamet (cimetidine), most major drug companies didn't take tummy troubles terribly seriously.
1985, Joe Graedon, Teresa Graedon, The New People's Pharmacy: Drug Breakthroughs for the '80s, Bantam, page 134