Estrogen ester

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An estrogen ester is an ester of an endogenous, steroidal estrogen, generally estradiol but also estrone or estriol.[1] Esterification renders these drugs into metabolically-resistant prohormones of their respective parent estrogen, improving oral bioavailability, increasing lipophilicity, and extending half-life (which necessitates less frequent administration).[2] In addition, with intramuscular injection, they are absorbed more slowly into the body, further improving half-life.[1]

Estrogen esters are used in hormone replacement therapy and as hormonal contraceptives, among other indications.

The first estrogen ester to be marketed was estradiol benzoate in 1936,[3][4] which was quickly followed by many more.

List of estrogen esters

Many esters of estradiol have been marketed, including the following:[5][6]

As well as the following esters of other estrogens:[5][6]

A few other estrogen esters which are notable but have not been marketed include atrimustine (bestrabucil), estrapronicate, orestrate, which are estradiol esters.[6]

See also

References

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