BACKGROUND/AIMS: This study aimed at comparing the efficacy and tolerability of 5 different regimens for Helicobacter pylori eradication in recent years. METHODS: H. pylori-positive patients with dyspeptic symptoms were included and separated into 5 groups. The 'PAC group' was given pantoprazole, amoxicillin and clarithromycin for 14 days. The 'PAM group' was given pantoprazole, amoxicillin and metronidazole for 14 days. The 'bismuth-containing group' was given pantoprazole, bismuth subsalicylate, tetracycline and metronidazole for 14 days. The 'sequential group' was given pantoprazole and amoxicillin for 5 days, followed by pantoprazole, tetracycline, and metronidazole for the next 5 days. The 'concomitant group' was given pantoprazole, amoxicillin, tetracycline, and metronidazole for 10 days. Eradication was assessed through the urea breath test on 6 weeks after eradication therapy. RESULTS: The eradication rate of intention-to-treat/per protocol were 42/48.3% in the PAC group, 52/54.2% in the PAM group, 62/77.5% in the bismuth group, 71/80.7% in the sequential group and 72/83.7% in concomitant group. The frequency of mild and moderate side effects was similar between groups. CONCLUSION: The concomitant and sequential therapies are an effective treatment for H. pylori. Bismuth-containing therapy is superior to conventional triple therapies; however, the eradication rate is not satisfactory. In our country, conventional triple therapies are not effective for eradication.