title: The refractory ulcer.
mesh_terms: D002927:Cimetidine / Q000627:therapeutic use*; D004351:Drug Resistance; D004381:Duodenal Ulcer / Q000188:drug therapy*; D006801:Humans; D012008:Recurrence; D013276:Stomach Ulcer / Q000188:drug therapy*; D014945:Wound Healing / Q000187:drug effects*
chemical_list: D002927:Cimetidine