PRECAUTIONS: Before taking this medication, tell your doctor or pharmacist if you are allergic to methenamine or sodium acid phosphate; or to formaldehyde; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.Before using this medication, tell your doctor or pharmacist your medical history, especially of: kidney problems, liver problems, dehydration, high blood levels of certain minerals (sodium or phosphate), heart failure, swelling of ankles/feet, fluid in the lungs (pulmonary edema), high blood pressure, high blood pressure during pregnancy, parathyroid problems, disease of the pancreas (pancreatitis), metabolic imbalance (metabolic acidosis).This product contains a large amount of sodium. It should be used with caution if you are on a low-sodium diet.Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.This drug passes into breast milk and the effect on a nursing infant is unknown. Consult your doctor before breast-feeding.
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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.
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