The recommended dose is 30 mg lansoprazole 2 times daily for one week in combination with one of the following three combinations: a) amoxicillin 1 g twice daily + clarithromycin 500 mg twice daily, b) clarithromycin 250 mg twice daily + metronidazole 400-500 mg twice daily, c) amoxicillin 1 g twice daily + metronidazole 400-500 mg twice daily.