Factor Xa inhibitor drugs
Factor Xa inhibitor drugs are used to prevent DVT
in patients un-dergoing total hip and knee replacement surgery or surgery to
re-pair a hip fracture. The only factor Xa inhibitor drug used in the United
States is fondaparinux.
Administered subQ, fondaparinux is absorbed rapidly
and com-pletely and is excreted primarily unchanged in urine. Its effects peak
within 2 hours of administration and last for about 17 to 24 hours.
Fondaparinux binds to antithrombin III and greatly
influences the neutralization of factor Xa by antithrombin III. Neutralization
of factor
Xa interrupts the coagulation cascade, thereby inhibiting clot formation.
Fondaparinux is used only to
prevent the formation of blood clots.
Avoid administering fondaparinux
with another drug that may increase the risk of bleeding. (See Adverse
reactions to factor Xa inhibitors.)
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