Dose-Related Kinetics of Aspirin

Abstract
When aspirin is administered by mouth in low doses, poor systemic bioavailability may contribute to its apparent dose-related "selective inhibition" of THROMBOXANE A2 formation. Systemic bioavailability of orally administered aspirin is necessary to inhibit prostacyclin synthesis by systemic vascular endothelium, whereas cumulative inhibition of thromboxane A2 formation by platelets may occur in the presystemic (portal) circulation.