Teriparatide is a recombinant form of parathyroid hormone that stimulates new bone formation and increases bone mineral density by activating osteoblasts. It is produced through recombinant DNA technology and used to treat osteoporosis by increasing the number and activity of osteoblasts, decreasing their programmed death, and recruiting more osteoblasts. Common side effects include muscle cramps, leg cramps, joint pain, and symptoms of a cold like cough and runny nose.