Sevelamer Carbonate is prescribed to reduce high blood phosphorus (phosphate) levels in the case that are on dialysis due to intense kidney conditions. Dialysis clears some phosphate from your blood, though it is difficult to remove sufficiently to maintain your phosphate levels balanced. Lowering blood phosphate levels can support maintaining your bones healthy, prevent unsafe growth of minerals in your body, and perhaps reduce the risk of heart conditions and strokes that can occur from high phosphate levels. The medicine functions by grabbing onto phosphate from the diet so that it can move out of your body.