Dược Động Học :
▧ Absorption :
Pravastatin is rapidly absorbed with peak plasma levels of the parent compound achieved 1 to 1.5 hours after administration. The average oral absorption of pravastatin is 34% and absolute bioavailability is 17%. These values however, are variable. Food decreases the systemic bioavailability but the lipid-lowering effect is not impacted. When 20 mg of pravastatin is given orally, the pharmacokinetic parameters are as follows: Cmax = 23.3-26.3 ng/mL; AUC = 54.7 to 62.2 ng•hr/mL.
▧ Protein binding :
50% bound to human plasma proteins.
▧ Metabolism :
Hepatic, there is a small amount of metabolism by P450 enzymes, but this effect is so minimal that inhibitory pharmacokinetic drug interactions have no real effect on its overall activity and elimination. An in vitro study which found moderate affinity for P450 2C9 (major), 2D6 and 3A4. Furthermore, the major degradation product is the 3α-hydroxy isomeric metabolite, which has one-tenth to one-fortieth the HMG-CoA reductase inhibitory activity of the parent compound.
▧ Route of Elimination :
Approximately 20% of a radiolabeled oral dose is excreted in urine and 70% in the feces. After intravenous administration, 47% of total body clearance was via renal excretion, while 53% was eliminated by non-renal routes.
▧ Half Life :