How drugs act. Drugs and the gastrointestinal tract.
D004381:Duodenal Ulcer / Q000188:drug therapy; D005765:Gastrointestinal Agents / Q000627:therapeutic use*; D005767:Gastrointestinal Diseases / Q000188:drug therapy*; D006801:Humans; D013276:Stomach Ulcer / Q000188:drug therapy
D005765:Gastrointestinal Agents