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15β-Hydroxycyproterone acetate

15β-Hydroxycyproterone acetate
15β-Hydroxycyproterone acetate.svg
Clinical data
Synonyms15β-Hydroxy-CPA; 15β-OH-CPA; 6-Chloro-15β,17α-dihydroxy-1α,2α-methylenepregna-4,6-diene-3,20-dione 17α-acetate; 6-Chloro-1,2α-methylene-15β,17α-dihydroxy-δ6-progesterone 17α-acetate
CAS Number
PubChem CID
Chemical and physical data
Molar mass432.941 g/mol g·mol−1
3D model (JSmol)

15β-Hydroxycyproterone acetate (15β-OH-CPA) is a steroidal antiandrogen and the major metabolite of cyproterone acetate which is formed from it in the liver by hydroxylation via the cytochrome P450 enzyme CYP3A4.[1][2][3] It circulates at concentrations that are approximately twice those of CPA.[4] In addition, it has similar or even greater antiandrogen activity relative to CPA[5] but only about one-tenth of its activity as a progestogen.[6] It also shows some glucocorticoid activity similarly to cyproterone acetate and unesterified cyproterone.[7][8]

See also


  1. ^ Fabian M. Saleh (11 February 2009). Sex Offenders: Identification, Risk Assessment, Treatment, and Legal Issues. Oxford University Press, USA. pp. 197–. ISBN 978-0-19-517704-6.
  2. ^ Bińkowska M, Woroń J (June 2015). "Progestogens in menopausal hormone therapy". Przegla̜d Menopauzalny = Menopause Review. 14 (2): 134–43. doi:10.5114/pm.2015.52154. PMC 4498031. PMID 26327902.
  3. ^ Michael Boarder; David Newby; Phyllis Navti (25 March 2010). Pharmacology for Pharmacy and the Health Sciences: A Patient-centred Approach. OUP Oxford. pp. 632–. ISBN 978-0-19-955982-4.
  4. ^ Frith RG, Phillipou G (1985). "15-Hydroxycyproterone acetate and cyproterone acetate levels in plasma and urine". J. Chromatogr. 338 (1): 179–86. doi:10.1016/0378-4347(85)80082-7. PMID 3160716.
  5. ^ V. H. T. James; J. R. Pasqualini (22 October 2013). Hormonal Steroids: Proceedings of the Sixth International Congress on Hormonal Steroids. Elsevier. pp. 398–. ISBN 978-1-4831-9067-9.
  6. ^ Kuhl H (2005). "Pharmacology of estrogens and progestogens: influence of different routes of administration". Climacteric. 8 Suppl 1: 3–63. doi:10.1080/13697130500148875. PMID 16112947.
  7. ^ Bhargava AS, Kapp JF, Poggel HA, Heinick J, Nieuweboer B, Günzel P (1981). "Effect of cyproterone acetate and its metabolites on the adrenal function in man, rhesus monkey and rat". Arzneimittelforschung. 31 (6): 1005–9. PMID 6266428.
  8. ^ Excerpta medica. Section 30. Pharmacology and toxicology. 1982. In addition, cyprosterone acetate and its main metabolite, 15β-hydroxy acetate, as well as the newly isolated free alcohol of the main metabolite were characterized for their corticosteroid-like activity in rats. Cyproterone acetate treatment of male hypersexual subjects and female rhesus monkeys did not reveal any signs of adrenal suppression. Cyproterone acetate and its metabolites gave no indication of any appreciable antiinflammatory effect in the adjuvant edema test in rats. However, there was a general increase in the level of blood glucose and liver glycogen as well as a reduction in body weight and organ weight (spleen, thymus and adrenal) in rats, in which 15β-hydroxy cyproterone was slightly more active with the exception of adrenal weight reduction, which was almost equal in all three compounds tested. It can also be concluded that adult man and rhesus monkey are much less sensitive, if at all so, to some corticosteroid-like activities of cyproterone acetate and its main metabolites than the rat.