PTH and secondary hyperparathyroidism: Calcimimetic agents, like NPS R-568 (Cinacalcet HCl), is an allosteric agonist for parathyroid calcium-sensing receptor (CaSR) and was shown to lower circulating levels of parathyroid hormone (PTH) in patients with secondary hyperparathyroidism due to late-stage renal diseases [reviewed in [1,2]].