A a selective factor Xa inhibitor which, by binding to antithrombin III, Fondaparinux results in less thrombin formation and less thrombus growth, which is why it is used as an anticoagulant and antithrombotic. It is also used in the treatment of deep vein thrombosis and pulmonary embolism, thrombophlebitis of the lower extremities, various infarcts and unstable angina pectoris.