The starting dosage for adults is 25 mg of cinacalcet once daily, to be orally administered. With careful management of the patient's serum parathyroid hormone (PTH) and calcium levels, the dose may then be adjusted within a range of 25-75 mg once daily. If no improvement is found in PTH, the dose may be increased up to 100 mg once daily. If dose increase is required, dose should be increased by 25 mg at a time, at intervals of at least 3 weeks.