What does cimetidine mean?
Cimetidine is a prescription and over-the-counter medication belonging to a class of drugs known as H2-receptor antagonists, or H2 blockers. By blocking histamine receptors in the lining of the stomach, it reduces the amount of acid the stomach produces, which allows ulcers to heal and eases the symptoms of heartburn and gastro-oesophageal reflux disease. Introduced in the mid-1970s under the brand name Tagamet, cimetidine was revolutionary: it was one of the first blockbuster drugs and transformed peptic ulcer disease from an ailment often requiring surgery into one managed with tablets. Although safer alternatives in the same class, such as famotidine, are now more commonly prescribed — partly because cimetidine interacts with many other medicines — the drug remains in use worldwide. The term appears almost exclusively in medical and pharmaceutical contexts rather than everyday conversation.
nounA synthetic drug that blocks H2 (histamine) receptors in the stomach, reducing acid production and used chiefly to treat peptic ulcers and gastro-oesophageal reflux disease.
- An H2-receptor antagonist drug used to reduce stomach acid and treat ulcers and reflux.
"The doctor prescribed cimetidine to heal the patient's stomach ulcer."
"She took cimetidine before meals to control her acid reflux."
"Early studies showed that cimetidine dramatically accelerated ulcer healing."
Rarely pluralised except when counting individual tablets or doses; normally treated as an uncountable mass noun referring to the drug.
"The bottle contained thirty cimetidines, enough for a fortnight's course."
Before cimetidine arrived in the 1970s, stomach ulcers often meant major surgery — this one pill made operations for ulcers largely obsolete.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cimetidine
Cimetidine was coined in the early 1970s by researchers at Smith, Kline & French who were developing anti-ulcer drugs based on modifications of the histamine molecule. The name combines 'ci-' from cyano (a group present in the molecule) with elements referencing its methyl-substituted imidazole core, following the '-dine' convention common among chemical drug names. Related drug names such as ranitidine and famotidine were modelled on it and share the same '-tidine' ending.
How cimetidine is actually used
Cimetidine is a formal, medical register term, encountered mainly in clinical contexts, pharmacy labelling, and health writing; lay speakers usually say 'an antacid' or name a brand such as Tagamet. It is countable when referring to tablets and uncountable when referring to the substance.
Easily confused with cimetidine
Ranitidine is a different H2-receptor blocker in the same drug class; the names sound alike because both share the '-tidine' suffix common to such drugs.