title: Cimetidine and gastrointestinal haemorrhage in critically ill patients.
mesh_terms: D002927:Cimetidine / Q000009:adverse effects*; D006471:Gastrointestinal Hemorrhage / Q000188:drug therapy*; D006801:Humans; D011014:Pneumonia / Q000209:etiology
chemical_list: D002927:Cimetidine