Study in Chronic Kidney Disease (CKD) Not on Dialysis

Inclusion Criteria: * Male and female patients aged 20 years or above at the time of informed consent * Chronic Kidney Disease patients with Epidermal growth factor receptor (eGFR) under 60 ml/min/1.73m2 (stage 3, 4 and 5) who have not been on dialysis * Patients who had been in the care of a physician for Chronic Kidney Disease for \>2 months and was not expected to begin dialysis for at least 4 months * Patients with serum phosphate levels 5.6 mg/dL to 11.0 mg/dL at Week -4 (Visit 1) or Week -2 (Visit 2) Exclusion Criteria: * Patients with hypocalcemia or hypercalcemia (corrected serum calcium level of \< 7.0 mg/dL or \>/- 11.0 mg/dL) at Week -2 (Visit 2). * Significant renal impairments * Had acute renal failure within 3 months of Run-in period