Cimetidine now.
D002927:Cimetidine / Q000627:therapeutic use*; D002986:Clinical Trials as Topic; D004941:Esophagitis / Q000188:drug therapy*; D006146:Guanidines / Q000627:therapeutic use*; D006801:Humans; D010437:Peptic Ulcer / Q000188:drug therapy*; D015043:Zollinger-Ellison Syndrome / Q000188:drug therapy*
D006146:Guanidines; D002927:Cimetidine