Control of Serum Phosphorus: Used in patients with Chronic Kidney Disease (CKD) who are on dialysis. Hyperphosphatemia: Management of high phosphorus levels in the blood, which can occur when the kidneys can no longer filter it out effectively.

Unlike many vitamins or medications that are absorbed into the bloodstream, Sevelamer stays in the gut: Binding in the Gut: When you eat, phosphorus is present in your food. Sevelamer acts like a "chemical sponge." Prevention of Absorption: As it passes through the digestive tract, it binds to the phosphorus in your food. Excretion: Because the phosphorus is now "stuck" to the Sevelamer, it cannot be absorbed into your blood and is instead passed out of the body through your stool.

Since this medication works entirely within the digestive system, most side effects are gastrointestinal: Common: Nausea, vomiting, diarrhea, indigestion, and stomach pain. Constipation: This is very common; the drug can slow down the movement of the gut. Flatulence (Gas): Increased bloating and gas. Serious (Rare): Bowel obstruction or perforation (severe blockage), especially in patients with existing digestive issues.