Nandrolone decanoate (Nandrolone, 17β-Hydroxyestra-4-en-3-one) is an anabolic steroid with androgenic effect. Its action develops gradually (up to 3 days), reaches the maximum on day 7 and lasts for about 3 weeks. Metabolized in the liver with the formation of various forms of keto steroids, approximately 90% of which are excreted in the urine.

As a medicament, it is used in the treatment of chronic infectious diseases, severe trauma, major surgical interventions, steroid myopathy, myelofibrosis, myelosclerosis, bone marrow myeloid aplasia, bone marrow metastases of malignant neoplasms, growth retardation in children,

Nandrolone is highly active as testosterone and is therefore of interest as doping. Therefore, the International Olympic Committee (IOC) establishes a concentration of Nandrolone in the urine of athletes within the following limits: 2 nanograms / ml for men and 5 nanograms / ml for women.