Ranitidine in cimetidine-resistant ulcers.
D000368:Aged; D000897:Anti-Ulcer Agents / Q000627:therapeutic use*; D002927:Cimetidine / Q000627:therapeutic use*; D004351:Drug Resistance; D006801:Humans; D008297:Male; D008875:Middle Aged; D010437:Peptic Ulcer / Q000188:drug therapy*; D011899:Ranitidine / Q000627:therapeutic use*
D000897:Anti-Ulcer Agents; D002927:Cimetidine; D011899:Ranitidine