Fondaparinux sodium is an antithrombin-dependent factor Xa inhibitor.
Fondaparinux sodium is the first agent of a new class of anticoagulants that selectively target factor Xa. For Fondaparinux, its IC50 values (anti-Xa IU/ml) are 0.59±0.05 for activated monocytes (ac-M) and 0.17±0.03 for monocyte-derived microparticles (MMPs)[2].
Fondaparinux sodium has a linear, dose-dependent pharmacokinetic profile, which provides a highly predictable response. Fondaparinux sodium is 100% bioavailable, has a rapid onset of action, and has a half-life of 14 to 16 hours, allowing for sustained antithrombotic activity over a 24-hour period. The drug does not affect prothrombin time or activated partial thromboplastin time, nor does it affect platelet function or aggregation[1].
References:
[1]. Bauer KA. et al. Fondaparinux sodium: a selective inhibitor of factor Xa. Am J Health Syst Pharm. 2001 Nov 1;58 Suppl 2:S14-7.
[2]. Ben-Hadj-Khalifa S, et al. Differential coagulation inhibitory effect of fondaparinux, enoxaparin and unfractionated heparin in cell models of thrombin generation. Blood Coagul Fibrinolysis. 2011 Jul;22(5):369-73.