Clinical data
Routes of
Synonyms Exogestin, letogestin[1]
CAS Number 110072-15-6
PubChem (CID) 159355
ChemSpider 140146
KEGG D06197
Chemical and physical data
Formula C21H24O2
Molar mass 308.41406 g/mol
3D model (Jmol) Interactive image

Tosagestin (INN, USAN) (developmental code name Org 30659), also known as 11-methylene-D-15-norethisterone or 17α-hydroxy-11-methylene-19-norpregna-4,15-dien-20-yn-3-one, is a selective, steroidal progestin of the 19-nortestosterone group that was under development by Organon in the United States and Europe as a hormonal contraceptive (in combination with ethinyl estradiol) and for the treatment of menopausal symptoms but was never marketed.[2][3][4][5][6]


  1. Martin Negwer; Hans-Georg Scharnow (2001). Organic-chemical drugs and their synonyms: (an international survey). Wiley-VCH. p. 2104. ISBN 978-3-527-30247-5.
  2. World Health Organization (2013), The use of stems in the selection of International Nonproprietary Names (INN) for pharmaceutical substances (PDF), p. 95
  3. AdisInsight, Tosagestin, Springer, retrieved 12 July 2016
  4. Verhoeven CH, Krebbers SF, Wagenaars GN, Booy CJ, Groothuis GM, Olinga P, Vos RM (1998). "In vitro and in vivo metabolism of the progestagen Org 30659 in several species". Drug Metab. Dispos. 26 (11): 1102–12. PMID 9806953.
  5. de Visser, S.J.; Uchida, N.; van Vliet-Daskalopoulou, E.; Fukazawa, I.; van Doorn, M.B.A.; van den Heuvel, M.W.; Machielsen, C.S.M.; Uchida, E.; Cohen, A.F. (2003). "Pharmacokinetic differences between Caucasian and Japanese subjects after single and multiple doses of a potential combined oral contraceptive (Org 30659 and EE)". Contraception. 68 (3): 195–202. doi:10.1016/S0010-7824(03)00140-9. ISSN 0010-7824. PMID 14561540.
  6. Obruca, Andreas; Korver, Tjeerd; Huber, Johannes; Killick, Stephen R; Landgren, Britt-Marie; Struijs, Martin J (2001). "Ovarian function during and after treatment with the new progestagen Org 30659". Fertility and Sterility. 76 (1): 108–115. doi:10.1016/S0015-0282(01)01824-6. ISSN 0015-0282. PMID 11438328.

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