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DRUG INTERACTIONS: Tell your doctor of all the medications you may use, both prescription and nonprescription, especially of: warfarin, certain live vaccines, nitrofurantoin, quinapril, didanosine, vitamins/minerals (e.g., magnesium, aluminum, calcium, iron, zinc), antacids, sucralfate, bismuth subsalicylate. Do not start or stop any medicine without doctor or pharmacist approval.

OVERDOSE: If overdose is suspected, contact your local poison control center or emergency room immediately. US residents can call the US national poison hotline at 1-800-222-1222. Canadian residents should call their local poison control center directly. Symptoms of overdose may include seizures, vomiting, nausea, and unusual sluggishness.

NOTES: This medication has been prescribed for your current condition only. Do not use it later for another infection or give it to someone else. A different medication may be needed in those cases. Nalidixic acid can cause false results in some diabetic urine testing products (cupric sulfate-type). Consult your doctor or pharmacist for recommendations.

MISSED DOSE: If you miss a dose, take as soon as remembered; do not take if it is almost time for the next dose, instead, skip the missed dose and resume your usual dosing schedule. Do not "double-up" the dose to catch up.

STORAGE: Store at room temperature away from sunlight and moisture. If your doctor tells you to stop taking nalidixic acid, throw away any unused medication. Nalidixic acid loses effectiveness over time and should not be saved to treat another infection.

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.