1.NounA drug C22H22F3N·HCl (trademark Sensipar) that is administered orally to treat hyperparathyroidism in patients with chronic kidney failure undergoing dialysis and to treat certain types of hypercalcemia (as that associated with parathyroid carcinoma). It increases the sensitivity of receptor cells of the parathyroid gland to extracellular calcium causing a decrease in parathyroid hormone secretion.