SIDE EFFECTS: This medication may cause stomach upset, diarrhea, headache, nausea, and vomiting which should disappear in a few days as your body adjusts to the medication. If these symptoms persist or become severe, inform your doctor. Notify your doctor immediately if you experience: fever, fatigue, sore throat, unusual bleeding or bruising, abdominal pain, bloating, vision changes or eye pain, tingling of the hands or feet. In the unlikely event you have an allergic reaction to this drug, seek medical attention immediately. Symptoms of an allergic reaction include: rash, itching, swelling, dizziness, trouble breathing. If you notice other effects not listed above, contact your doctor or pharmacist.

PRECAUTIONS: Before using this drug, tell your doctor your medical history especially of: liver disease, kidney disease, G6PD deficiency, porphyria, any drug allergies. Use extreme caution when giving this drug to children less than 2 years old. This drug should be used only when clearly needed during pregnancy. Discuss the risks and benefits with your doctor. This drug is excreted into breast milk. It is not known if it is safe to breast-feed while using this drug. Consult your doctor before breast-feeding.

DRUG INTERACTIONS: Tell your doctor of all prescription and nonprescription drugs you may use, especially of: diabetes medicine, warfarin, phenytoin, phenobarbital, rifampin, other antibiotics, vitamin B12, iron, folic acid. This drug may interfere with the effectiveness of birth control pills. Discuss using other methods of birth control with your doctor. Do not start or stop any medicine without doctor or pharmacist approval.

Report Problems to the Food and Drug Administration You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088. Need help identifying pills and medications? Use the pill identifier tool on RxList.