Lecatonin, also known as calcinin, is a new type of calcitonin synthesized artificially; It has the effect of lowering blood calcium and blood phosphorus, and also inhibits the bone resorption promotion effect of prostaglandin E1, 1,25-(OH)2 vitamin D2 and osteoclast activating factor, and can also inhibit the secretion of gastric juice and gastric acid, promote the excretion of Na+ and K+ from urine, increase urine output, and increase the ratio of Na+/K+; Clinically, it is often used for degenerative osteitis (Paget's disease), osteoporosis, hypercalcemia, and painful bone disease; It is also used for renal osteodystrophy and bone metastasis of malignant tumors.