Forteo (generic: teriparatide) is a prescription medication used to treat both men and postmenopausal women with osteoporosis who are at high risk for having broken bones. Forteo is a synthetic hormone that is similar to the one the body makes naturally (parathyroid hormone). It works by causing the body to build new bone and increase bone strength by regulating calcium and phosphate.

Forteo comes in an injectable form that is given once daily. It is injected just under the skin of the stomach area or thigh.

Common side effects of Forteo include nausea, joint aches, and pain.