 Compliance and Adverse Effect Patients compliance will be assessed by standardized interview at the end of treatment as well as by pill count in the medication boxes returned at the interview. Compliance is considered low when more than 20 of pills is found in the box. At enrollment, the patients will be informed of the common side effects from the studied antibiotics, including diarrhea, taste disturbance, nausea, bloating, loss of appetite, vomiting, abdominal pain, constipation, headache, and skin rash. 