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For people on dialysis, controlling your renal diet alone usually won’t keep your phosphorus levels in a healthy range. This is where phosphorus binders come in. Phosphorus binders (also called phosphate binders) prevent the body from absorbing the phosphorus from the food you eat.
Phosphorus binders help to pass excess phosphorus out of the body in the stool, reducing the amount of phosphorus that gets into the blood. Usually phosphate binders are taken within 5 to 10 minutes before or immediately after meals and snacks. Your doctor and renal dietitian will tell you when you should take your phosphate binders and discuss how many you need to take when you eat. Smaller meals and snacks usually require a lower number of phosphorus binders; with larger meals you may take more.
People on dialysis get monthly lab results that show if their phosphorus level is in a healthy range (3.0 to 5.5 mg/dL, or as close to the laboratory reference range as possible). If your phosphorus levels are not in a healthy range, you can talk with your doctor or dietitian and take action to change what you are eating. They may also adjust your phosphorus binder prescription, if you need another brand or should be taking a different amount.
Phosphorus binders work in one of two ways. Some phosphate binders, such as Renvela, work like a sponge and soak up the phosphates in the food so that it doesn’t get into the blood. Instead it is carried through the digestive tract and eliminated in the stool. Other phosphorus binders, such as Fosrenol, Phoslo and Tums, work like a magnet. The phosphorus in the food connects to the phosphorus binder and it is carried through the digestive tract to be eliminated.
Some people may be prescribed a combination of phosphorus binders to help keep their phosphorus level in a healthy range.
There are four common types of phosphorus binders: calcium-based phosphorus binders; aluminum-free, calcium-free phosphorus binders; aluminum-based phosphorus binders; and magnesium-based phosphorus binders.
Phosphorus binders combined with a low-phosphate diet can help keep you active and healthy. Talk to your doctor or dietitian to find out more about phosphorus binders and which combination may work best for you.
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