H2 receptor antagonists--cimetidine and ranitidine.
D002927:Cimetidine / Q000008:administration & dosage*; D004381:Duodenal Ulcer / Q000188:drug therapy; D005663:Furans / Q000008:administration & dosage*; D006146:Guanidines / Q000008:administration & dosage*; D006801:Humans; D011899:Ranitidine
D005663:Furans; D006146:Guanidines; D002927:Cimetidine; D011899:Ranitidine