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 endogenousestrogen, and the 16β-epimer of estriol (which is 16α-hydroxy-17β-estradiol). Epiestriol is (or has previously been) used clinically in the treatment of acne. 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).
Relative affinities (%) of epiestriol and related steroids
^Latman NS, Kishore V, Bruot BC (June 1994). "16-epiestriol: an anti-inflammatory steroid without glycogenic activity". Journal of Pharmaceutical Sciences. 83 (6): 874–7. doi:10.1002/jps.2600830623. PMID9120824.
^Miller E, Bates R, Bjorndahl J, Allen D, Burgio D, Bouma C, Stoll J, Latman N (November 1998). "16-Epiestriol, a novel anti-inflammatory nonglycogenic steroid, does not inhibit IFN-gamma production by murine splenocytes". Journal of Interferon & Cytokine Research. 18 (11): 921–5. doi:10.1089/jir.1998.18.921. PMID9858313.