Ethisterone
Chemical compound / From Wikipedia, the free encyclopedia
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Ethisterone, also known as ethinyltestosterone, pregneninolone, and anhydrohydroxyprogesterone and formerly sold under the brand names Proluton C and Pranone among others, is a progestin medication which was used in the treatment of gynecological disorders but is now no longer available.[3][4][5] It was used alone and was not formulated in combination with an estrogen.[1][6] The medication is taken by mouth.[4]
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Trade names | Proluton C, Pranone, others |
Other names | Ethinyltestosterone; Ethynyltestosterone; Pregneninolone; Anhydrohydroxyprogesterone; Etisteron; Pregnin; Ethindrone |
Routes of administration | By mouth, sublingual[1] |
Drug class | Progestogen; Progestin; Androgen; Anabolic steroid |
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Metabolites | • 5α-Dihydroethisterone[2] |
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ECHA InfoCard | 100.006.452 |
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Formula | C21H28O2 |
Molar mass | 312.453 g·mol−1 |
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Side effects of ethisterone include masculinization among others.[4][7][8] Ethisterone is a progestin, or a synthetic progestogen, and hence is an agonist of the progesterone receptor, the biological target of progestogens like progesterone.[9] It has some androgenic and anabolic activity and no other important hormonal activity.[9][10][11][12][13]
Ethisterone was discovered in 1938 and was introduced for medical use in Germany in 1939 and in the United States in 1945.[14][15][16] It was the second progestogen to be marketed, following injected progesterone in 1934, and was both the first orally active progestogen and the first progestin to be introduced.[17][18][15] Ethisterone was followed by the improved and much more widely used and known progestin norethisterone in 1957.[19][20]