title: Clinical comparison of H2-antagonists.
mesh_terms: D002927:Cimetidine / Q000627:therapeutic use*; D004381:Duodenal Ulcer / Q000188:drug therapy*; D006801:Humans; D011899:Ranitidine / Q000627:therapeutic use*; D013276:Stomach Ulcer / Q000188:drug therapy*
chemical_list: D002927:Cimetidine; D011899:Ranitidine