H2 antagonist non-responders.
D000126:Achlorhydria / Q000139:chemically induced; D004351:Drug Resistance; D004381:Duodenal Ulcer / Q000188:drug therapy*; D006635:Histamine H2 Antagonists / Q000009:adverse effects*; D006801:Humans
D006635:Histamine H2 Antagonists