Read the Medication Guide provided by your pharmacist before you start taking norfloxacin and get a refill each time. If you have any questions, ask your doctor or pharmacist.
Take this medication by mouth as directed by your doctor, usually twice a day (every 12 hours) with a full glass of water (8 ounces/240 milliliters). Do not have any food or dairy products (such as milk/yogurt) within 2 hours or 1 hour after taking norfloxacin. Drink plenty of fluids while taking this drug unless your doctor tells you otherwise. The dosage and length of treatment are based on your medical condition and response to treatment.
Take this medication at least 2 hours before or 2 hours after taking other products that may make it work less well. Examples include quinapril, sucralfate, vitamins/minerals (including iron, and zinc), and products that contain magnesium, aluminum, or calcium (such as antacids, didanosine solution, and calcium-enriched juice), among others. Ask your pharmacist about all the products you take.
Avoid taking large amounts of caffeine (such as coffee, and energy drinks) since this drug may increase and/or make the effects of caffeine last longer.