Cimetidine-Induced Coma in Cirrhosis of the Liver

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Abstract
To the Editor.— Cimetidine, a potent H2-receptor antagonist, has been recently introduced for the suppression of gastric acid secretion.1,2This medication has the ability to produce gynecomastia and breast swelling when used for a prolonged period (as in the Zollinger-Ellison syndrome)3and apparently has a mild sedative effect when given orally.4Although the usual route of administration is oral, the medication can be given intramuscularly and intravenously (IV). I recently observed a patient in whom profound coma developed while receiving cimetidine, which reversed when the therapy was discontinued. I believe this potential side effect of cimetidine should be brought to the attention of treating physicians. Report of a Case.— A 53-year-old bartender, who admits to a 25-year history of excessive alcohol use (which he claims he discontinued three months before hospitalization), was admitted to Franklin General Hospital,Valley Stream, NY, for massive upper gastrointestinal (GI) bleeding.

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