Clinical data
Trade names Ginecosid, Ginecoside, Mediol, Renodiol
Routes of
Synonyms 17α-Methylestra-1,3,5(10)-triene-3,17β-diol; NSC-52245
CAS Number 302-76-1
PubChem (CID) 66413
ChemSpider 59787
Chemical and physical data
Formula C19H26O2
Molar mass 286.40854 g/mol
3D model (Jmol) Interactive image

Methylestradiol, or 17α-methylestradiol (17α-ME), is a semisynthetic, steroidal estrogen that has been sold in combination with normethandrone (methylestrenolone), an anabolic-androgenic steroid and progestin and , under brand names including Ginecosid, Ginecoside, Mediol, Renodiol for the treatment of menopausal symptoms in Brazil, Venezuela, and Indonesia.[1][2][3] Due to the presence of the 17α-methyl group, methylestradiol cannot be deactivated by oxidation of the 17β-hydroxy group, resulting in improved metabolic stability and potency relative to estradiol analogously to ethinyl estradiol (17α-ethinylestradiol).[4] In addition to its clinical use, methylestradiol has been studied as a radiopharmaceutical.[5]

Methylestradiol is an active metabolite of the anabolic-androgenic steroids methyltestosterone (17α-methyltestosterone) and metandienone (17α-methyl-δ1-testosterone) and is responsible for their estrogenic side effects such as gynecomastia (breast development) and fluid retention.[4][6][6]

See also


  1. J. Elks (14 November 2014). The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies. Springer. pp. 898–. ISBN 978-1-4757-2085-3.
  2. "Methylestradiol". Retrieved 2 January 2016.
  3. IARC Working Group on the Evaluation of Carcinogenic Risks to Humans; World Health Organization; International Agency for Research on Cancer (2007). Combined Estrogen-progestogen Contraceptives and Combined Estrogen-progestogen Menopausal Therapy. World Health Organization. pp. 389–. ISBN 978-92-832-1291-1.
  4. 1 2 Detlef Thieme; Peter Hemmersbach (18 December 2009). Doping in Sports. Springer Science & Business Media. pp. 470–. ISBN 978-3-540-79088-4.
  5. Feenstra A, Vaalburg W, Nolten GM, Reiffers S, Talma AG, Wiegman T, van der Molen HD, Woldring MG (1983). "Estrogen receptor binding radiopharmaceuticals: II. Tissue distribution of 17 alpha-methylestradiol in normal and tumor-bearing rats". J. Nucl. Med. 24 (6): 522–8. PMID 6406650.
  6. 1 2 William Llewellyn (2011). Anabolics. Molecular Nutrition Llc. pp. 533–. ISBN 978-0-9828280-1-4.

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