Helicobacter Rescue Therapy With Berberine Plus Amoxicillin Quadruple Therapy Versus Tetracycline Plus Furazolidone Quadruple Therapy

Inclusion Criteria:

1. Patients who had failed H.pylori eradication therapies before.
2. Age between 18\~70, both gender.
3. Patients who had failed H.pylori eradication therapies during last 2 years and stop the eradication therapies for at least 2 months.
4. Women are eligible if they are not pregnant or nursing, and if they are of childbearing potential they are required to use medically acceptable contraception for the duration of the study and 30 days thereafter.

Exclusion Criteria:

1. Patients are excluded if they have previously used tetracycline and furazolidone antibiotics to eradicate infection with H. pylori.
2. Contraindications to study drugs.
3. Substantial organ impairment, severe or unstable cardiopulmonary or endocrine disease.
4. Constant use of anti-ulcer drugs ( including taking proton-pump. inhibitors(PPI) within 2 weeks before the \[13C\] urea breath test), antibiotics or bismuth complexes (more than 3 times /1 month before screening).
5. Pregnant or lactating women.
6. Underwent upper gastrointestinal Surgery.
7. Patients with Barrett esophageal or highly atypical hyperplasia, have symptom of dysphagia.
8. Evidence of bleeding or iron efficiency anemia.
9. A history of malignancy.
10. Drug or alcohol abuse history in the past 1 year.
11. Systemic use of corticosteroids, non steroidal anti-inflammatory drugs, anticoagulants, platelet aggregation inhibitors (except the use of aspirin for less than 100 mg/d).
12. Enrolled in other clinical trials in the past 3 months.
13. Patients who has psychological problem or poor compliance.
14. Refuse to sign informed consent.