studies of 24-hour intragastric acidity in duodenal ulcer patients have shown that 4 weeks of treatment with omeprazole , 20 mg once daily , resulted in a reduction of median intragastric acidity by 97 % , which was superior to the 57 % median reduction achieved with ranitidine , 150 mg b.d. , for 4 weeks in the same patients .
C0013295
duodenal ulcer
C0034665
ranitidine