Comparison Efficacy of 14-day Triple Therapy: Clarithromycin vs. Levofloxacin on Eradication of H. Pylori

Inclusion Criteria: 1-Patients are aged greater than 18 years old who have H. pylori infection diagnosed by any of following three methods: I-Positive rapid urease test (CLOtest). II-Histologic evidence of H. pylori by modified Giemsa staining. III-Positive 13C-urea breath test. without prior eradication therapy and are willing to receive therapy. Exclusion Criteria: 1. Children and teenagers aged less than 18 years. 2. Previous eradication treatment for H. pylori. 3. Patients who took any drug, which could influence the study results such as proton pump inhibitor, H2 blocker, mucosal protective agent and antibiotics. 4. History of gastrectomy. 5. Gastric malignancy, including adenocarcinoma and lymphoma, 6. Previous allergic reaction to antibiotics (Amoxicillin, Clarithromycin, Levofloxacin) and prompt pump inhibitors (Es-omeprazole). 7. Contraindication to treatment drugs. 8. Pregnant or lactating women. 9. Severe concurrent disease. 10. Liver cirrhosis. 11. Chronic kidney disease. 12. Patients who cannot give informed consent by himself or herself.