title: Cimetidine and ranitidine.
mesh_terms: D002927:Cimetidine / Q000009:adverse effects / Q000627:therapeutic use*; D005663:Furans / Q000009:adverse effects / Q000627:therapeutic use*; D006146:Guanidines / Q000627:therapeutic use*; D006801:Humans; D010437:Peptic Ulcer / Q000188:drug therapy; D011899:Ranitidine
chemical_list: D005663:Furans; D006146:Guanidines; D002927:Cimetidine; D011899:Ranitidine