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The mean oral bioavailability of finasteride is approximately 65%. [1] Its volume of distribution is 76 L/kg. [1] The plasma protein binding of finasteride is 90%. [1] The drug has been found to cross the blood–brain barrier , whereas levels in semen were found to be undetectable. [1] Finasteride is extensively metabolized in the liver , first by hydroxylation via CYP3A4 and then by aldehyde dehydrogenase . [1] The metabolites of finasteride have about 20% of its potency in inhibiting 5α-reductase and hence its metabolites are not particularly active. [1] The drug has a terminal half-life of 5 to 6 hours in adult men (18–60 years of age) and a terminal half-life of 8 hours or more in elderly men (greater than 70 years of age). [1] It is eliminated as its metabolites 57% in the feces and 40% in the urine . [1]

Zi trenbolone

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