title: Comparison of intravenous ranitidine & cimetidine on gastric acid secretion & pH.
mesh_terms: D000293:Adolescent; D000328:Adult; D002927:Cimetidine / Q000627:therapeutic use*; D004381:Duodenal Ulcer / Q000188:drug therapy*; D005744:Gastric Acid / Q000378:metabolism*; D006801:Humans; D008875:Middle Aged; D011899:Ranitidine / Q000627:therapeutic use*
chemical_list: D002927:Cimetidine; D011899:Ranitidine