Estetrol is orally absorbed and bioavailable with a strong dose-response relationship suggesting high oral bioavailability. Interindividual variations of plasma levels are low. The elimination half-life of 28 h suggests slow metabolism of E(4). The pharmacodynamic pattern complies with enterohepatic recirculation. Estetrol has a profound central inhibitory and dose-dependent effect on gonadotropins, confirming its biological potency.
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