H. pylori Eradication Regimens

First-Line Treatment

The American Gastroenterological Association strongly favors bismuth quadruple therapy as the optimal first-line approach for H. pylori eradication, achieving eradication rates of 80-90% even against metronidazole-resistant strains 1
Bismuth quadruple therapy consists of a PPI twice daily, bismuth subsalicylate, metronidazole, and tetracycline for 14 days, and is recommended by the American Gastroenterological Association for first-line treatment 1, 2

In areas with low clarithromycin resistance (<15%), triple therapy may be considered as an alternative first-line option, consisting of a PPI twice daily, clarithromycin, and amoxicillin for 14 days 1, 2

The American College of Gastroenterology recommends a 14-day treatment duration for first-line therapy to maximize the chance of success on the first attempt, as 14-day treatment duration is superior to shorter courses, improving eradication success by approximately 5% compared to 7-10 day regimens 1, 2
The American Gastroenterological Association advises against repeating antibiotics to which the patient has been previously exposed, especially clarithromycin and levofloxacin, as this dramatically increases resistance and treatment failure 1, 2

The American Gastroenterological Association recommends confirming eradication with urea breath test or monoclonal stool antigen test at least 4 weeks after completion of therapy and at least 2 weeks after PPI discontinuation 2

If bismuth quadruple therapy fails, the American Gastroenterological Association recommends using levofloxacin triple therapy (PPI + amoxicillin + levofloxacin) for 14 days as a second-line approach, assuming no previous levofloxacin exposure and low local resistance 1, 2