Also available in 1 mg, 5 mg, 25 mg, 50 mg, 100 mg and bulk. Please contact Fisher for quotes. Etelcalcetide hydrochloride (AMG 416 hydrochloride) is a synthetic peptide that serves as an allosteric modulator of the calcium-sensing receptor (CaSR), effectively reducing parathyroid hormone (PTH) levels in patients with secondary hyperparathyroidism undergoing hemodialysis. Purity 100%