A Prospective, Randomized Study of Quadruple Therapy and High‐Dose Dual Therapy for Treatment of <i>Helicobacter Pylori</i> Resistant to Both Metronidazole and Clarithromycin

Both high-dose dual therapy and quadruple therapy are effective in curing H. pylori infection resistant to both metronidazole and clarithromycin in patients who experienced previous treatment failures.