Δ4-Tibolone
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Δ4-Tibolone (developmental code name ORG-OM-38), also known as 7α-methylnorethisterone or as 7α-methyl-17α-ethynyl-19-nortestosterone, is a synthetic
androgen An androgen (from Greek ''andr-'', the stem of the word meaning "man") is any natural or synthetic steroid hormone that regulates the development and maintenance of male characteristics in vertebrates by binding to androgen receptors. This in ...
and progestin which was never marketed. The compound is a major
active metabolite An active metabolite is an active form of a drug after it has been processed by the body. Metabolites of drugs An active metabolite results when a drug is metabolized by the body into a modified form which continues to produce effects in the body ...
of
tibolone Tibolone, sold under the brand name Livial among others, is a medication which is used in menopausal hormone therapy and in the treatment of postmenopausal osteoporosis and endometriosis. The medication is available alone and is not formulated ...
, which itself is a prodrug of δ4-tibolone along with
3α-hydroxytibolone 3α-Hydroxytibolone (developmental code name ORG-4094) is a synthetic steroidal estrogen which was never marketed. Along with 3β-hydroxytibolone and δ4-tibolone, it is a major active metabolite of tibolone, and 3α-hydroxytibolone and 3β-hy ...
and
3β-hydroxytibolone 3β-Hydroxytibolone (developmental code name ORG-30126) is a synthetic steroidal estrogen which was never marketed. Along with 3α-hydroxytibolone and δ4-tibolone, it is a major active metabolite of tibolone, and 3α-hydroxytibolone and 3β- ...
(which, in contrast to δ4-tibolone, are
estrogen Estrogen or oestrogen is a category of sex hormone responsible for the development and regulation of the female reproductive system and secondary sex characteristics. There are three major endogenous estrogens that have estrogenic hormonal ac ...
s). Tibolone and δ4-tibolone are thought to be responsible for the androgenic and progestogenic activity of tibolone, while 3α-hydroxytibolone and 3β-hydroxytibolone are thought to be responsible for its estrogenic activity.


See also

*
List of androgens/anabolic steroids This is a list of androgens/ anabolic steroids (AAS) or testosterone derivatives. Esters are mostly not included in this list; for esters, see here instead. The major classes of testosterone derivatives include the following (as well as combinat ...
* List of progestogens


References

Abandoned drugs Tertiary alcohols Alkene derivatives Alkyne derivatives Androgens and anabolic steroids Estranes Human drug metabolites Ketones Progestogens {{Steroid-stub