Ferric citrate is used to lower high blood phosphate levels in people who are on dialysis due to severe kidney disease. Dialysis removes some phosphate from your blood, but it is difficult to remove enough to keep your phosphate levels balanced. Decreasing blood phosphate levels can help keep your bones strong, prevent unsafe buildup of minerals in your body, and may decrease the risk of heart disease and strokes that can result from high phosphate levels. This medication works by binding to phosphate in the foods you eat. The phosphate then passes out of your body in your stool. Ferric citrate is a form of iron. This medication is also used to treat low blood levels of iron (anemia) in people with long-term kidney disease who are not on dialysis. Iron is an important mineral that your body needs to produce red blood cells and keep you in good health.