title: Histamine blocker effective vs severe gastric bleeding.
mesh_terms: D002927:Cimetidine / Q000494:pharmacology / Q000627:therapeutic use*; D005753:Gastric Mucosa / Q000187:drug effects; D005756:Gastritis / Q000188:drug therapy*; D006471:Gastrointestinal Hemorrhage / Q000188:drug therapy*; D006146:Guanidines / Q000627:therapeutic use*; D006801:Humans; D012008:Recurrence; D013276:Stomach Ulcer / Q000517:prevention & control
chemical_list: D006146:Guanidines; D002927:Cimetidine