Trial of a New Formulation of KRX-0502 (Ferric Citrate) in Patients With End-Stage Renal Disease

Inclusion Criteria: 1. Males and non-pregnant, non-lactating females 2. Age \> 18 years 3. On thrice weekly hemodialysis for at least the previous three months prior to screening 4. Serum phosphorus levels ≥ 2.5 mg/dL and \< 8.5 mg/dL at Screening Visit (Visit 0) 5. Serum phosphorus levels \> 5.5 mg/dL at Study Drug Initiation Visit (Visit 3) 6. Taking 3 to 18 tablets/capsules/day of calcium acetate calcium carbonate, lanthanum carbonate, sevelamer (hydrochloride or carbonate), or any combination of these agents as reported by the patient at screening 7. Serum ferritin \<1000micrograms/L and Transferrin Saturation (TSAT) \<50% 8. Willing to be discontinued from current phosphate binder(s) and initiated on KRX-0502 (ferric citrate) 9. Willing and able to give informed consent Exclusion Criteria: 1. Parathyroidectomy within six months prior to Screening Visit (Visit 0) 2. Actively symptomatic gastrointestinal bleeding and inflammatory bowel disease 3. Serum phosphorus levels \>10.0 mg/dL documented in the three monthly laboratories (done routinely in the dialysis unit) in the three months prior to the Screening Visit (Visit 0) 4. History of multiple drug allergies 5. History of malignancy in the last five years (treated cervical or skin cancer may be permitted if approved by Keryx) 6. Previous intolerance to oral ferric citrate 7. Absolute requirement for oral iron therapy 8. Absolute requirement for Vitamin C (multivitamins \[Centrum, Nephrocaps, Renaphro, etc.\] allowed) 9. Absolute requirement for calcium, magnesium, or aluminum containing drugs with meals 10. Psychiatric disorder that interferes with the patient's ability to comply with the study protocol 11. Inability to tolerate oral drug intake 12. Planned surgery or hospitalization during the study (scheduled outpatient access surgery allowed) 13. Any other medical condition that renders the patient unable to or unlikely to complete the study or that would interfere with optimal participation in the study or produce significant risk to the patient 14. Receipt of any investigational drug within 30 days of randomization 15. Inability to cooperate with study personnel or history of noncompliance 16. Prior exposure to ferric citrate 17. Patients with hemochromatosis or Thalassemia