Dược Động Học :
▧ Absorption :
Absolute bioavailability is very low following oral administration (2%). Following oral inhalation, bioavailability is 4% to 17%.
▧ Protein binding :
Zanamivir has limited plasma protein binding (<10%).
▧ Metabolism :
Not metabolized
▧ Route of Elimination :
It is excreted unchanged in the urine with excretion of a single dose completed within 24 hours.
Unabsorbed drug is excreted in the feces.Zanamivir is renally excreted as unchanged drug.
▧ Half Life :
2.5-5.1 hours
▧ Clearance :
* 2.5 - 10.9 L/h [Following oral inhalation 10 mg]
* 5.3 L/h [Normal renal function receiving IV single dose of 4 mg or 2 mg]
* 2.7 L/h [Patients with mild and moderate renal impairement receiving IV single dose of 4 mg or 2 mg]
* 0.8 L/h [Patients with severe renal impairement receiving IV single dose of 4 mg or 2 mg]