Gabexate mesylate (FOY) is a serine proteinase inhibitor used therapeutically in the treatment of pancreatitis, disseminated intravascular coagulation (DIC), and as a regional anticoagulant for hemodialysis. The drug inhibits the hydrolytic effects of thrombin, plasmin, and kallikrein, but not of chymotrypsin and aprotinin.

Letaxaban (TAK-442) is a small molecule Xa factor inhibitor that can be used to study polar coronary syndromes and thrombotic blockages.

Apixaban (BMS-562247-01) is an orally active anticoagulant that inhibits coagulation factor Xa, directly preventing the conversion of prothrombin to thrombin and the formation of cross-linked fibrin clots.

Zifaxaban (TY-602) is an orally active, competitive and selective inhibitor of factor Xa (FXa) with an IC50 of 11.1 nM for human FXa.Zifaxaban has a very high affinity, more than 10,000-fold higher than that of other serine proteases.Zifaxaban can be used to study arterial and venous thrombosis.

Betrixaban (PRT054021) is a non-vitamin K oral anticoagulant whose action is driven by the competitive and reversible inhibition of the factor Xa [1]. It was selected among all lead compounds due to its low hERG channel affinity while sustaining its factor Xa inhibition capacity [3]. Betrixaban, now developed by Portola Pharmaceuticals Inc., is prescribed as a venous thromboembolism (VTE) prophylactic for adult patients with moderate to severe restricted motility or with other risks for VTE [2]. VTE can be manifested as deep vein thrombosis or pulmonary embolism and it is a leading cause of preventable death in hospitalized patients [4].