PRECAUTIONS: Tell your doctor your medical history, especially of: liver or kidney problems, asthma or other breathing problems, vitamin (folic acid) deficiency, diabetes, blood disorders (e.g., bone marrow suppression, G6PD deficiency), allergies (especially drug allergies). This medication may make you prone to sunburn. If you become sun sensitive, wear protective clothing and a sunscreen. This medication should not be used in infants younger than 2 months. However, if the decision is made to use this medication in infants (neonates), it should be known that a preservative (benzyl alcohol) which may be found in this product or in the liquid used to mix this product (diluent) can infrequently cause serious problems (sometimes death), if given in large amounts (more than 100 mg/kg daily) to an infant during the first months of life (neonatal period). The risk is also greater with low birth weight infants. Symptoms include sudden gasping, low blood pressure, or a very slow heartbeat. Report these symptoms to the doctor immediately should they occur. If possible, a preservative-free product should be used when treating neonates. Caution is advised when using this drug in the elderly because they may be more sensitive to the side effects of the drug (e.g., allergic skin reactions). This drug should be used only when clearly needed during pregnancy and the use of this drug is not recommended near term. Discuss the risks and benefits with your doctor. This drug is excreted into breast milk and may have undesirable effects on the nursing infant. Consult your doctor before breast- feeding.

DRUG INTERACTIONS: Inform your doctor about all the medicines you may use (both prescription and nonprescription), especially of: other antibiotics, warfarin, oral drugs for diabetes, phenytoin, methotrexate, cyclosporine, digoxin, drugs which can increase potassium levels (e.g., ACE Inhibitors such as captopril, lisinopril), oral PABA. Do not start or stop any medicine without doctor or pharmacist approval.