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Clinical data
Trade namesCur-men, Ercostrol, Geklimon, Novestrine, Vallestril (also spelled Vallestrol or Vallestryl)
Other namesMethallenoestril; Methallenestrol; Methallenoestrol; Horeau's acid; Allenestrol 6-methyl ether; α,α-Dimethyl-β-ethylallenolic acid 6-methyl ether; β-Ethyl-6-methoxy-α,α-dimethyl-2-naphthalenepropionic acid
Routes of
By mouth
Drug classNonsteroidal estrogen
ATC code
CAS Number
PubChem CID
CompTox Dashboard (EPA)
ECHA InfoCard100.007.485 Edit this at Wikidata
Chemical and physical data
Molar mass286.365 g/mol g·mol−1
3D model (JSmol)

Methallenestril (INN) (brand names Cur-men, Ercostrol, Geklimon, Novestrine, Vallestril), also known as methallenoestril (BAN) and as methallenestrol, as well as Horeau's acid,[1][2] is a synthetic nonsteroidal estrogen and a derivative of allenolic acid and allenestrol (specifically, a methyl ether of it) that was formerly used to treat menstrual issues but is now no longer marketed.[3][4][5][6] It is a seco-analogue of bisdehydrodoisynolic acid, and although methallenestril is potently estrogenic in rats, in humans it is only weakly so in comparison.[7] Vallestril was a brand of methallenestril issued by G. D. Searle & Company in the 1950s.[8] Methallenestril is taken by mouth.[9] By the oral route, a dose of 25 mg methallenestril is approximately equivalent to 1 mg diethylstilbestrol, 4 mg dienestrol, 20 mg hexestrol, 25 mg estrone, 2.5 mg conjugated estrogens, and 0.05 mg ethinylestradiol.[9]

See also


  1. ^ Erich Heftmann (1970). Steroid Biochemistry. Academic Press. p. 144.
  2. ^ Dodds, E. C. (1949). "Synthetic aestrogens". Journal of Pharmacy and Pharmacology. 1 (1): 137–147. doi:10.1111/j.2042-7158.1949.tb12391.x. ISSN 0022-3573.
  3. ^ C.R. Ganellin; David J. Triggle (21 November 1996). Dictionary of Pharmacological Agents. CRC Press. pp. 1295–. ISBN 978-0-412-46630-4.
  4. ^ I.K. Morton; Judith M. Hall (6 December 2012). Concise Dictionary of Pharmacological Agents: Properties and Synonyms. Springer Science & Business Media. pp. 177–. ISBN 978-94-011-4439-1.
  5. ^ John A. Thomas; Edward J. Keenan (1986). Principles of Endocrine Pharmacology. Springer Science & Business Media. pp. 171–. ISBN 978-1-4684-5036-1.
  6. ^ Herbai G, Ljunghall S (1983). "Normalization of hypercalcaemia of primary hyperparathyroidism by treatment with methallenestril, a synthetic oestrogen with low oestrogenicity". Urol. Int. 38 (6): 371–3. doi:10.1159/000280925. PMID 6659184.
  7. ^ Raymond Eller Kirk; Donald Frederick Othmer (1980). Encyclopedia of chemical technology. Wiley. p. 670. ISBN 978-0-471-02065-3.
  8. ^ Library of Congress. Copyright Office (1965). Catalog of Copyright Entries. Third Series: 1963: July-December. Copyright Office, Library of Congress. pp. 1984–.
  9. ^ a b Swyer GI (April 1959). "The oestrogens". Br Med J. 1 (5128): 1029–31. doi:10.1136/bmj.1.5128.1029. PMC 1993181. PMID 13638626.