Keryx Biopharmaceuticals, Inc. is a biopharmaceutical company focused on the development of medicines for people with renal disease. The Company is engaged in the manufacture, development and commercialization of products for use in treating human diseases. Its marketed product, Auryxia (ferric citrate), which is an orally available, absorbable, iron-based medicine is approved in the United States for the control of serum phosphorus levels in patients with chronic kidney disease (CKD) on dialysis. Auryxia is marketed in Japan under the brand name Riona. It is investigating the use of ferric citrate for the treatment of iron deficiency anemia (IDA) in adults with non-dialysis dependent (NDD), CKD and NDD-CKD. It focuses on Keryx Patient Plus program to assist with patient accessibility to Auryxia. It has completed a Phase II clinical trial and a Phase III clinical trial of ferric citrate to gain Food and Drug Administration approval to use ferric citrate in patients with NDD-CKD.