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Methylestradiol molecule ball.png
Clinical data
Trade namesGinecosid, Ginecoside, Mediol, Renodiol
Other namesNSC-52245; 17α-Methylestradiol; 17α-ME; 17α-Methylestra-1,3,5(10)-triene-3,17β-diol
Routes of
By mouth[1]
Drug classEstrogen
  • (8R,9S,13S,14S,17S)-13,17-dimethyl-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthrene-3,17-diol
CAS Number
PubChem CID
ECHA InfoCard100.005.572 Edit this at Wikidata
Chemical and physical data
Molar mass286.415 g·mol−1
3D model (JSmol)
  • CC12CCC3C(C1CCC2(C)O)CCC4=C3C=CC(=C4)O
  • InChI=1S/C19H26O2/c1-18-9-7-15-14-6-4-13(20)11-12(14)3-5-16(15)17(18)8-10-19(18,2)21/h4,6,11,15-17,20-21H,3,5,7-10H2,1-2H3/t15-,16-,17+,18+,19+/m1/s1

Methylestradiol, sold under the brand names Ginecosid, Ginecoside, Mediol, and Renodiol, is an estrogen medication which is used in the treatment of menopausal symptoms.[2][3][4] It is formulated in combination with normethandrone, a progestin and androgen/anabolic steroid medication.[3][4] Methylestradiol is taken by mouth.[1]

Side effects of methylestradiol include nausea, breast tension, edema, and breakthrough bleeding among others.[5] It is an estrogen, or an agonist of the estrogen receptors, the biological target of estrogens like estradiol.[6]

Methylestradiol is or has been marketed in Brazil, Venezuela, and Indonesia.[3] In addition to its use as a medication, methylestradiol has been studied for use as a radiopharmaceutical for the estrogen receptor.[7]

Medical uses[edit]

Methylestradiol is used in combination with the progestin and androgen/anabolic steroid normethandrone (methylestrenolone) in the treatment of menopausal symptoms.[3][4]

Available forms[edit]

Methylestradiol is marketed in combination with normethandrone in the form of oral tablets containing 0.3 mg methylestradiol and 5 mg normethandrone.[8][9]

Side effects[edit]

Side effects of methylestradiol include nausea, breast tension, edema, and breakthrough bleeding.[5]



Methylestradiol is an estrogen, or an agonist of the estrogen receptor.[6] It shows somewhat lower affinity for the estrogen receptor than estradiol or ethinylestradiol.[6]

Methylestradiol is an active metabolite of the androgens/anabolic steroids methyltestosterone (17α-methyltestosterone), metandienone (17α-methyl-δ1-testosterone), and normethandrone (17α-methyl-19-nortestosterone), and is responsible for their estrogenic side effects, such as gynecomastia and fluid retention.[10][11][12]

Relative affinities (%) of methylestradiol and related steroids
Estradiol 2.6 7.9 100 0.6 0.13 8.7 <0.1
Ethinylestradiol 15–25 1–3 112 1–3 <1 ? ?
Methylestradiol 3–10, 15–25 1–3 67 1–3 <1 ? ?
Methyltestosterone 3 45, 100–125 ? 1–5 ? 5 ?
Normethandrone 100 146 <0.1 1.5 0.6 ? ?
Sources: Values are percentages (%). Reference ligands (100%) were progesterone for the PR, testosterone for the AR, E2 for the ER, DEXA for the GR, aldosterone for the MR, DHT for SHBG, and cortisol for CBG. Sources: [13][6][14][15]


Due to the presence of its C17α methyl group, methylestradiol cannot be deactivated by oxidation of the C17β hydroxyl group, resulting in improved metabolic stability and potency relative to estradiol.[10] This is analogous to the case of ethinylestradiol and its C17α ethynyl group.[10]


Methylestradiol, or 17α-methylestradiol (17α-ME), also known as 17α-methylestra-1,3,5(10)-triene-3,17β-diol, is a synthetic estrane steroid and a derivative of estradiol.[2][3] It is specifically the derivative of estradiol with a methyl group at the C17α positions.[2][3] Closely related steroids include ethinylestradiol (17α-ethynylestradiol) and ethylestradiol (17α-ethylestradiol).[2] The C3 cyclopentyl ether of methylestradiol has been studied and shows greater oral potency than methylestradiol in animals, similarly to quinestrol (ethinylestradiol 3-cyclopentyl ether) and quinestradol (estriol 3-cyclopentyl ether).[16]


Methylestradiol was first marketed, alone as Follikosid and in combination with methyltestosterone as Klimanosid, in 1955.[17][18][19][20]

Society and culture[edit]

Generic names[edit]

Methylestradiol has not been assigned an INN or other formal name designations.[2][3] Its generic name in English and German is methylestradiol, in French is méthylestradiol, and in Spanish is metilestadiol.[3] It is also known as 17α-methylestradiol.[3]

Brand names[edit]

Methylestradiol is or has been marketed under the brand names Ginecosid, Ginecoside, Mediol, and Renodiol, all in combination with normethandrone.[3][2]


Methylestradiol is or has been marketed in Brazil, Venezuela, and Indonesia.[3]


  1. ^ a b HEGEMANN O (May 1959). "[Oral hormonal treatment with methylestrene-olone & methylestradiol as early pregnancy tests]". Medizinische (in German). 4 (21): 1032–3. PMID 13673847.
  2. ^ a b c d e f 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.
  3. ^ a b c d e f g h i j k "Methylestradiol". Retrieved 2 January 2016.
  4. ^ a b c 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.
  5. ^ a b Wittlinger, H. (1980). "Clinical Effects of Estrogens". Functional Morphologic Changes in Female Sex Organs Induced by Exogenous Hormones. pp. 67–71. doi:10.1007/978-3-642-67568-3_10. ISBN 978-3-642-67570-6.
  6. ^ a b c d Ojasoo T, Raynaud JP (November 1978). "Unique steroid congeners for receptor studies". Cancer Res. 38 (11 Pt 2): 4186–98. PMID 359134.
  7. ^ 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.
  8. ^ Unlisted Drugs. Pharmaceutical Section, Special Libraries Association. 1982. Batynid. C. Each dragee contains: normethandrone, 5 mg.; and methylestradiol, 0.3 mg. E. (Formerly) Gynaekosid. M. Boehringer Biochemia, Florence. A. Estrogenic; Rx of secondary amenorrhea. R. Notiz Med Farm 32;295, Nov-Dec 81.
  9. ^ Akingba JB, Ayodeji EA (February 1966). "Amenorrhea as a leading symptom of choriocarcinoma". J Obstet Gynaecol Br Commonw. 73 (1): 153–5. doi:10.1111/j.1471-0528.1966.tb05137.x. PMID 5948541.
  10. ^ a b c Detlef Thieme; Peter Hemmersbach (18 December 2009). Doping in Sports. Springer Science & Business Media. pp. 470–. ISBN 978-3-540-79088-4.
  11. ^ William Llewellyn (2011). Anabolics. Molecular Nutrition Llc. pp. 533–. ISBN 978-0-9828280-1-4.
  12. ^ Friedl KE (1990). "Reappraisal of the health risks associated with the use of high doses of oral and injectable androgenic steroids". NIDA Res. Monogr. 102: 142–77. PMID 1964199.
  13. ^ Raynaud, J.P.; Ojasoo, T.; Bouton, M.M.; Philibert, D. (1979). "Receptor Binding as a Tool in the Development of New Bioactive Steroids". Drug Design. pp. 169–214. doi:10.1016/B978-0-12-060308-4.50010-X. ISBN 9780120603084.
  14. ^ 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.
  15. ^ 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.
  16. ^ Falconi, G., Rossi, G. L., & Ercoli, A. (1970). Quinestrol and other cyclopentyl ethers of estrogenic steroids: different rates of storage in body fat.
  17. ^ "Neue Spezialitäten". Klinische Wochenschrift. 33 (31–32): 773–774. 1955. doi:10.1007/BF01473523. ISSN 0023-2173. S2CID 1678069.
  18. ^ Heinrich Kahr (8 March 2013). Konservative Therapie der Frauenkrankheiten: Anzeigen, Grenzen und Methoden Einschliesslich der Rezeptur. Springer-Verlag. pp. 20–. ISBN 978-3-7091-5694-0.
  19. ^ Georg Arends; Heinrich Zörnig; Hermann Hager; Georg Frerichs, Walther Kern (14 December 2013). Hagers Handbuch der pharmazeutischen Praxis: Für Apotheker, Arzneimittelhersteller, Drogisten, Ärzte u. Medizinalbeamte. Springer-Verlag. pp. 1156–1157, 1164. ISBN 978-3-662-36329-4.
  20. ^ Burghard Helwig (1956). Moderne Arzneimittel: eine Spezialitätenkunde nach Indikationsgebieten für Ärzte und Apotheker. Wissenschaftliche Verlagsgesellschaft. p. 240.