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Clinical data
Trade names Actriol, Arcagynil, Klimadoral
Synonyms Epioestriol; 16β-Epiestriol; 16-Epiestriol; 16β-Hydroxy-17β-estradiol
Routes of
By mouth
Drug class Estrogen
CAS Number
PubChem CID
Chemical and physical data
Formula C18H24O3
Molar mass 288.38136 g/mol
3D model (JSmol)

Epiestriol (INN) (brand names Actriol, Arcagynil, Klimadoral), or epioestriol (BAN), also known as 16β-epiestriol or simply 16-epiestriol as well as 16β-hydroxy-17β-estradiol, is a minor and weak endogenous estrogen, and the 16β-epimer of estriol (which is 16α-hydroxy-17β-estradiol).[1][2] Epiestriol is (or has previously been) used clinically in the treatment of acne;[1] in addition to its estrogenic actions, epiestriol has been found to possess significant anti-inflammatory properties without glycogenic activity or immunosuppressive effects, an interesting finding that is in contrast to conventional anti-inflammatory steroids like hydrocortisone (a glucocorticoid).[3][4]

See also[edit]


  1. ^ a b J. Elks (14 November 2014). The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies. Springer. pp. 899–. ISBN 978-1-4757-2085-3. 
  2. ^ A. Labhart (6 December 2012). Clinical Endocrinology: Theory and Practice. Springer Science & Business Media. pp. 522–. ISBN 978-3-642-96158-8. 
  3. ^ Latman NS, Kishore V, Bruot BC (1994). "16-epiestriol: an anti-inflammatory steroid without glycogenic activity". J Pharm Sci. 83 (6): 874–7. doi:10.1002/jps.2600830623. PMID 9120824. 
  4. ^ Miller E, Bates R, Bjorndahl J, Allen D, Burgio D, Bouma C, Stoll J, Latman N (1998). "16-Epiestriol, a novel anti-inflammatory nonglycogenic steroid, does not inhibit IFN-gamma production by murine splenocytes". J. Interferon Cytokine Res. 18 (11): 921–5. doi:10.1089/jir.1998.18.921. PMID 9858313. 
  5. ^ Raynaud, J.P.; Ojasoo, T.; Bouton, M.M.; Philibert, D. (1979). "Receptor Binding as a Tool in the Development of New Bioactive Steroids": 169–214. doi:10.1016/B978-0-12-060308-4.50010-X. 
  6. ^ Ojasoo T, Raynaud JP (November 1978). "Unique steroid congeners for receptor studies". Cancer Res. 38 (11 Pt 2): 4186–98. PMID 359134. 
  7. ^ Ojasoo T, Delettré J, Mornon JP, Turpin-VanDycke C, Raynaud JP (1987). "Towards the mapping of the progesterone and androgen receptors". J. Steroid Biochem. 27 (1-3): 255–69. doi:10.1016/0022-4731(87)90317-7. PMID 3695484. 
  8. ^ Raynaud JP, Bouton MM, Moguilewsky M, Ojasoo T, Philibert D, Beck G, Labrie F, Mornon JP (January 1980). "Steroid hormone receptors and pharmacology". J. Steroid Biochem. 12: 143–57. doi:10.1016/0022-4731(80)90264-2. PMID 7421203.