Follow the directions for using this medicine provided by your doctor. TAKE THIS MEDICINE at least 1 hour before or 2 hours after eating. DRINK A FULL GLASS OF WATER with each dose. Drink several additional glasses of water daily, unless otherwise directed by your doctor. TAKE THIS MEDICINE 2 hours before or 2 hours after taking any products containing magnesium, aluminum, or calcium. Some examples include quinapril, didanosine, vitamins/minerals, and antacids. Dairy products (e.g., milk, yogurt), calcium-enriched juice, sucralfate, bismuth subsalicylate, iron, and zinc are also included. These products bind with norfloxacin preventing its full absorption. STORE THIS MEDICINE at room temperature, away from heat and light. TO CLEAR UP YOUR INFECTION COMPLETELY, continue taking this medicine for the full course of treatment even if you feel better in a few days. Do not miss any doses. IF YOU MISS A DOSE OF THIS MEDICINE, take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once.