title: H2 antagonists: long-term ulcer therapy?
mesh_terms: D002986:Clinical Trials as Topic; D004311:Double-Blind Method; D006635:Histamine H2 Antagonists / Q000627:therapeutic use*; D006801:Humans; D010437:Peptic Ulcer / Q000188:drug therapy*; D013997:Time Factors
chemical_list: D006635:Histamine H2 Antagonists