Teriparatide injection is used to treat osteoporosis (a condition in which the bones become thin and weak and break easily) in men and in women who have undergone menopause (‘change in life,’ end of menstrual periods), who are at high risk of fractures (broken bones). This medication is also used to treat osteoporosis in men and women who are taking corticosteroids (a type of medication that may cause osteoporosis in some patients). Teriparatide injection contains a synthetic form of natural human hormone called parathyroid hormone (PTH).