NCIt definition : An orally bioavailable protease-activated receptor-1 (PAR-1) antagonist, with antiplatelet
activity. Upon oral administration, vorapaxar binds to PAR-1 expressed on platelets,
and inhibits PAR-1-mediated platelet aggregation. Vorapaxar inhibits thrombin-induced
and thrombin receptor agonist peptide (TRAP)-induced platelet aggregation, and does
not inhibit platelet aggregation induced by adenosine diphosphate (ADP), collagen
or a thromboxane mimetic.;