Standard dose proton pump inhibitor, twice daily, and: • metronidazole, 400 mg (tinidazole, 500 mg) twice daily, + clarithromycin, 250 mg twice daily; • amoxicillin, 1000 mg twice daily, + clarithomycin, 500 mg twice daily (advisable when metronidazole resistance is likely); • amoxicillin, 500 mg three times daily, + metronidazole, 400 mg three times daily (advisable when clarithomycin resistance is likely) Since then new data became available that necessitated an update of the original guidelines in order to provide practical management guidelines that would be acceptable across clinical practice, both in primary care and the specialist level.