Nandrolone phenylpropionate (NPP), also known by the former brand name Durabolin, is an injectable anabolic-androgenic steroid (AAS). It is a synthetic derivative of testosterone, primarily used in medical settings to promote muscle growth and manage specific conditions like anemia and osteoporosis. 

• Treatment of refractory anemias by boosting red blood cell production.

• Management of osteoporosis (weak bones) in postmenopausal women by improving bone density.

• Palliative treatment for selected cases of disseminated breast cancer in women.

• Aiding recovery from chronic debilitating illnesses, major surgery, injury, or severe trauma, where the body is in a negative nitrogen balance (losing more protein than it builds).