Omeprazole, bismuth and clarithromycin in the sequential treatment of Helicobacter pylori infection

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Abstract
To assess the therapeutic potential of clarithromycin, a new macrolide with high anti-Helicobacter pylori activity, given with bismuth salts and omeprazole in different regimens aimed at simplifying the treatment of H. pylori-related gastritis. Eighty-eight patients with proven H. pylori infection and gastritis were treated with one of the following four regimens: omeprazole 40 mg/day for one week (group A, n = 14); omeprazole 40 mg/day for one week followed by clarithromycin 1 g/day for 2 weeks (group B, n = 26); omeprazole 40 mg/day for one week followed by tripotassium dicitrato bismuthate 480 mg/day and clarithromycin 1 g/day, both for two weeks (group C, n = 26); and tripotassium dicitrato bismuthate 480 mg/day and clarithromycin 1 g/day for two weeks (group D, n = 22). Presence of H. pylori, histology and electron microscopy were assessed at entry and four weeks after the end of each treatment. Omeprazole alone had no effect on H. pylori status. The highest eradication rate was obtained in group C patients (81%), a proportion significantly greater than that observed in group B (50%, P < 0.03) or group D patients (55%, P < 0.05). Sequential treatment may be a useful option in the treatment of H. pylori-related gastritis.