Dược Động Học :
▧ Absorption :
Readily absorbed from the gastrointestinal tract after oral administration with a bioavailability of 75%.
▧ Volume of Distribution :
* 23 to 26 L
▧ Protein binding :
Oseltamivir carboxylate: low (3%), Oseltamivir free base: 42%.
▧ Metabolism :
Extensively converted to oseltamivir carboxylate by esterases located predominantly in the liver. Neither oseltamivir nor oseltamivir carboxylate is a substrate for, or inhibitor of, cytochrome P450 isoforms. At least 75% of an oral dose reaches the systemic circulation as oseltamivir carboxylate.
▧ Route of Elimination :
Absorbed oseltamivir is primarily (>90%) eliminated by conversion to oseltamivir carboxylate. Oseltamivir carboxylate is not further metabolized and is eliminated in the urine. Oseltamivir carboxylate is eliminated entirely (>99%) by renal excretion.
▧ Half Life :
1 to 3 hours in most subjects after oral administration.