Lansoprazole-based sequential and concomitant therapy for the first-line Helicobacter pylori eradication.

Objective: The aim of this prospective study was to compare the efficacy of the first-line lansoprazole-based sequential therapy and concomitant therapy (lansoprazole, amoxicillin, clarithromycin and metronidazole) for Helicobacter pylori (H. pylori) eradication.

Methods: A total of 169 patients with H.