Ethylestrenol (INN, USAN, BAN) (brand names Maxibolin, Orabolin), or ethylnandrol (JAN), also known as 17α-ethyl ester-4-en-17β-ol or as 3-deketo-17α-ethyl-19-nortestosterone, is an anabolic-androgenic steroid (AAS) with some progestogenic activity, and low androgenic activity. It is a 17α-ethylated derivative of nandrolone and lacks the 3-keto group. It was described in the literature in 1959 and approved in 1964 for testosterone deficiency in male patients.

Nandrolone, also known as 19-nortestosterone or 19-norandrostenolone, is a semisynthetic anabolic-androgenic steroid derived from testosterone. Nandrolone is used in the form of a variety of long-acting prodrug esters for intramuscular injection, the most common of which are nandrolone decanoate. Nandrolone decanoate is indicated for the management of the anemia of renal insufficiency and has been shown to increase hemoglobin and red cell mass. Certain clinical effects and adverse reactions demonstrate the androgenic properties of this class of drugs. Complete dissociation of anabolic and androgenic effects has not been achieved. The actions of anabolic steroids are therefore similar to those of male sex hormones with the possibility of causing serious disturbances of growth and sexual development if given to young children. Anabolic steroids suppress the gonadotropic functions of the pituitary and may exert a direct effect upon the testis. Anabolic steroids have been reported to increase low-density lipoproteins and decrease high-density lipoproteins. Synthetic version of nandrolone was developed in 1950. But nandrolone for sale appeared later only in 1962 in the form of decanoate under the trade name Deca-Durabolin (Organon company).

Oxabolone is a synthetic anabolic steroid. It can be formulated as the cipionate ester prodrug oxabolone cipionate. Oxabolone cypionate is a structural derivative of nandrolone. It differs via the additional 4-hydroxyl group that is attached, therefore making oxabolone cypionate 4-hydroxynandrolone. Oxabolone is on the World Anti-Doping Agency's list of prohibited substances, and is therefore banned from use in most major sports. Oxabolone cypionate is a relatively rare drug that was once produced in Europe for human use. Was used for the treatment of osteoporosis. It is no longer produced by pharmaceutical companies; Upjohn and Pharmacia were the primary producers of it previously.