eight patients with previous duodenal ulcer in symptomatic remission underwent continuous intraluminal ph monitoring on five separate occasions to compare the effects on 24-h intragastric acidity of placebo , 300 mg ranitidine at night , 150 mg ranitidine twice daily , 40 mg famotidine at night , and 20 mg famotidine twice daily .
C0013295
duodenal ulcer
C0015620
famotidine