Efficacy of lansoprazole in eradication of Helicobacter pylori.

Fifty-eight Helicobacter pylori-positive ulcer patients received omeprazole 20 mg (n = 15), or lansoprazole 30 mg (n = 23), lansoprazole 60 mg (n = 13), or E3810 20 mg (n = 7) q.d. Another 63 H. pylori-positive ulcer patients received lansoprazole and clarithromycin for 2 weeks. Patients received lansoprazole 30 mg and clarithromycin 400 mg (group 1, n = 22), lansoprazole 30 mg and clarithromycin 800 mg (group 2, n = 12), or lansoprazole 60 mg and clarithromycin 800 mg (group 3, n = 29). Neither proton pump inhibitor (PPI) was capable of eradication by monotherapy, but the clearance rates in the lansoprazole group were 60.9 and 69.2%, which were higher than those for omeprazole (p < 0.05). In the dual therapy, eradication rates were 50, 50, and 72.4% in groups 1, 2, and 3, respectively. Minor side effects were observed in one case each in groups 1 and 3. Lansoprazole monotherapy proved more efficacious than omeprazole monotherapy, but it was unable to eradicate H. pylori. Dual therapy with lansoprazole 60 mg and clarithromycin 800 mg was an efficacious and safe regimen for H. pylori eradication in this study.