Overview Comparison of the Eradications Rates of Sequential Therapy Versus Concomitant Therapy Status: Unknown status Trial end date: 2016-08-01 Target enrollment: Participant gender: Summary Comparison of the eradications rates of sequential therapy versus concomitant therapy of treatment of Helicobacter pylori infection in Korea. single center, randomized trial 1. (pantoprazole 40 mg + amoxicillin 1.0g + clarithromycin 500 mg + metronidazole 500 mg) twice for 10 days 2. (pantoprazole 40 mg + amoxicillin 1.0g + clarithromycin 500 mg + metronidazole 500 mg) twice for 14 days 3. (pantoprazole 40 mg + amoxicillin 1.0g) twice for 5 days and subsequent pantoprazole 40mg + clarithromycin 500 mg + metronidazole 500 mg) twice for 5 days 4. (pantoprazole 40 mg + amoxicillin 1.0g) twice for 7 days and subsequent pantoprazole 40mg + clarithromycin 500 mg + metronidazole 500 mg) twice for 7 days 1st endpoint : Helicobacter pylori eradication rates (intention to treatment, per-protocol) 2nd endpoint : adverse event(nausea, vomiting, dizziness, bitter sense) drug compliance Phase: Phase 4 Details Lead Sponsor: Incheon St.Mary's HospitalTreatments: AmoxicillinClarithromycinMetronidazolePantoprazole