 Inclusion Criteria: - CKD patients requiring dialysis HD, HDF, HF for at least 1 month before enrolment - An iPTH determination within 14 days before randomisation must be greater than or equal to 300 pgmL biPTH greater than or equal to 150 pgmL - A serum calcium determination corrected for calcium within 14 days before randomisation must be greater than or equal to 8.4 mgdL 2.1 mmolL Exclusion Criteria: - Have an unstable medical condition, defined as having been hospitalised, other than for dialysis vascular access revision, within 30 days before day 1, or otherwise unstable in the judgment of the investigator - Are currently breast-feeding - Are performing peritoneal dialysis - Have had a parathyroidectomy in the 3 months before day 1 - Have a gastrointestinal disorder that may be associated with impaired absorption of orally administered medications or an inability to swallow tablets 