Efficiency Study of Clarithromycin and Bismuth-containing Quadruple Therapy to Treat H.Pylori

Inclusion Criteria: * patients who presented with upper gastrointestinal symptoms and endoscopically proven H.pylori-positive functional dyspepsia and scarred peptic ulcers Exclusion Criteria: * patients less than 18 years old, with history of H. pylori infection treatment, with previous gastric surgery, pregnancy, lactation, major systemic diseases, administration of antibiotics, bismuth, antisecretory drugs in the preceding 8 weeks, or allergy to any one of the given medication in the regimens.