title: 24 hour intragastric acidity during maintenance treatment with ranitidine.
mesh_terms: D000328:Adult; D004381:Duodenal Ulcer / Q000188:drug therapy / Q000378:metabolism; D005745:Gastric Acidity Determination; D006801:Humans; D008297:Male; D008875:Middle Aged; D011899:Ranitidine / Q000008:administration & dosage* / Q000627:therapeutic use; D013997:Time Factors
chemical_list: D011899:Ranitidine