in a study involving three centers , 105 patients with duodenal ulcer proven by endoscopy were randomly assigned to treatment with either the h+ , k+ , atpase inhibitor omeprazole ( 20 mg or 40 mg taken as a single morning dose ) , or ranitidine ( 150 mg morning and night ) .
C0013295
duodenal ulcer
C0034665
ranitidine