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Cimetidine Toxic Reactions Masquerading as Delirium Tremens

William W. Weddington Jr, MD; Anna E. Muelling, MD; Hans H. Moosa; Chase P. Kimball, MD; Randall R. Rowlett, MD
JAMA. 1981;245(10):1058-1059. doi:10.1001/jama.1981.03310350046023.
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CIMETIDINE, an inhibitor of gastric acid secretion, is widely used for the treatment of peptic ulcer and to prevent gastrointestinal (GI) bleeding in high-risk patients. Infrequent side effects of cimetidine include headache, dizziness, fatigue, rash, diarrhea, constipation, muscle pain, gynecomastia, and granulocytopenia.1,2

Grimson3 reported two cases of mental confusion after patients received double dosages. Subsequently, other case reports4-6 described cimetidine-associated confusion, delirium, depression, and coma. We describe a patient in whom a cimetidine-associated delirium developed that initially was thought to be alcohol withdrawal. Subsequent treatment of presumed delirium tremens led to a worsened clinical state.

Report of a Case  A 64-year-old woman was admitted to a hospital for upper abdominal pain. She had a history of drinking several beers each day, but her blood alcohol level was 0 mg/dL at admission. A nasogastric aspirate was guiac positive, and a spot urine amylase was positive. Her BUN and


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