You should not use this medicine if you have had an allergic reaction to sodium phosphate or potassium phosphate, or if you have infected phosphate stones. You should not use this medicine if you have severe kidney problems, or if you have hyperphosphatemia (too much phosphorus in your blood).
Your doctor will tell you how much of this medicine to use and how often. Do not use more medicine or use it more often than your doctor tells you to.
Take this medicine with a full (8 ounce) glass of water. Take it at meal times and again at bed time, unless your doctor tells you differently.
If a dose is missed:
If you miss a dose or forget to use your medicine, use it as soon as you can. If it is almost time for your next dose, wait until then to use the medicine and skip the missed dose. Do not use extra medicine to make up for a missed dose.
Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.
Make sure your doctor knows if you are also using blood pressure medicine, such as diazoxide, guanethidine, hydralazine, methyldopa, or rauwolfia alkaloid. Tell your doctor if you are using a corticosteroid medicine, such as a mineralocorticoid or corticotropin, or if you are also using a diuretic ("water pill"), such as spironolactone, triamterene, or Aldactone®. Make sure your doctor knows if you are also using digoxin (Lanoxin®) or a salicylate medicine, such as aspirin.
Avoid using antacids that contain aluminum, calcium, or magnesium while you are using a phosphate supplement. These type of antacids include aluminum carbonate, magnesium hydroxide, milk of magnesia, Basalgel®, Gaviscon®, Maalox®, and Rolaids®. Using antacids and phosphate supplements at the same time may cause the phosphate supplements not to work as well.
Make sure your doctor knows if you are pregnant or breast feeding, or if you have heart problems, high blood pressure, or Addison's disease. Tell your doctor if you have severe burns or other serious skin problems, or if you are dehydrated. Make sure your doctor knows if you have myotonia congenita (an inherited disease that affects your muscles).
Make sure your doctor knows if you have liver disease, severe kidney problems or swelling in your hands, feet or ankles. Tell your doctor if you have toxemia of pregnancy, hypoparathyroidism (too little activity of the parathyroid gland), acute pancreatitis, or rickets.
If you have kidney stones, you may pass old stones as you begin using this medicine.
Your doctor will need to check your progress at regular visits while you are using this medicine. Be sure to keep all appointments.