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Twice‐Daily Versus Thrice‐Daily Clarithromycin in Combination with Ranitidine Bismuth Citrate in the Eradication of Helicobacter pylori

Background. Ranitidine bismuth citrate (RBC), 400 mg bid for 4 weeks, plus clarithromycin, 500 mg tid, is a regimen approved by the US Food and Drug Administration for the eradication of Helicobacter pylori in patients with duodenal ulcers. Proof that the clarithromycin portion of the regimen could be given twice daily without loss of efficacy would reduce cost and improve patient compliance. The objective of this study was to compare the H. pylori eradication rates in patients who had duodenal ulcer and were randomly assigned to 4 weeks of treatment with RBC, 400 mg bid, in conjunction with 2 weeks of therapy with either clarithromycin, 500 mg tid, or clarithromycin, 500 mg bid.