One of the ANABOLIC STEROIDS, with the property of building PROTEIN. It is of little value in medical care, although is licensed for use in aplastic ANAEMIA. Its use as a body-builder by some athletes is regarded as illegal by sporting authorities. Nandrolone should never be taken by pregnant women or by people with liver disease or prostate cancer. Side-effects include ACNE; VIRILISATION with high doses, including voice changes, cessation of periods, and inhibition of sperm production; and liver tumours after prolonged use.