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Trade names | Monomestro, Monomestrol |
Other names | Monomethylstilbestrol; Diethylstilbestrol monomethyl ether |
Drug class | Nonsteroidal estrogen; Estrogen ether |
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Chemical and physical data | |
Formula | C19H22O2 |
Molar mass | 282.383 g·mol−1 |
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Mestilbol (brand name Monomestro or Monomestrol), also known as diethylstilbestrol monomethyl ether, is a synthetic nonsteroidal estrogen of the stilbestrol group related to diethylstilbestrol.[1][2][3] It was developed by Wallace & Tiernan Company,[3] patented in 1940,[4] and introduced for medical use in the 1940s,[5] but is now no longer marketed. Mestilbol was available both as oral tablets and in oil for intramuscular injection.[3][6] The drug is gradually demethylated in the body into diethylstilbestrol and hence is a prodrug of diethylstilbestrol.[7] Mestilbol is a highly active estrogen,[6] although somewhat less so than diethylstilbestrol,[8] but is longer-lasting in comparison.[9]