title: Duodenal ulcers that will not heal.
mesh_terms: D000897:Anti-Ulcer Agents / Q000627:therapeutic use*; D001562:Benzimidazoles / Q000627:therapeutic use; D001729:Bismuth / Q000627:therapeutic use; D002927:Cimetidine / Q000627:therapeutic use; D004351:Drug Resistance; D004381:Duodenal Ulcer / Q000188:drug therapy*; D006801:Humans; D009853:Omeprazole; D009942:Organometallic Compounds; D011899:Ranitidine / Q000627:therapeutic use
chemical_list: D000897:Anti-Ulcer Agents; D001562:Benzimidazoles; D009942:Organometallic Compounds; D002927:Cimetidine; D011899:Ranitidine; C002791:bismuth tripotassium dicitrate; D009853:Omeprazole; D001729:Bismuth