Keryx Biopharmaceuticals Inc. announced that the U.S. Food and Drug Administration has approved the trade name Auryxia(TM) (ferric citrate) for its FDA-approved ferric citrate. Auryxia, an iron-based phosphate binder, was approved by the FDA to control serum phosphorus levels in patients with chronic kidney disease (CKD) on dialysis in September 2014.