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Andexanet alfa for the reversal of anticoagulant activity in patients treated with direct and indirect factor Xa inhibitors.

INTRODUCTION: Andexanet alfa is a recombinant factor Xa decoy molecule that inhibits direct and indirect factor Xa inhibitors to allow the normal coagulation process to resume. Its development arises in a space where novel oral anticoagulants are receiving expanded indications yet their use is limited by the lack of an effective reversal agent. Areas covered: This article reviews the biochemical properties, mechanism of action and the preclinical and clinical trials on andexanet alfa. It additionally aims to provide expert commentary and future perspectives on the efficacy, safety and challenges facing andexanet alfa as a universal antidote for direct and indirect factor Xa inhibitors. Expert commentary: Andexanet alfa shows promise to become a highly effective, novel antidote for factor Xa anticoagulation. Its biochemical profile and mechanism of action are immediately more attractive than other drugs on the market and under development due to its inert nature within the normal coagulation cascade, with minimal intrinsic procoagulant or anticoagulant properties. The anticoagulant antidote space will continue to develop as more specific and universal options become available for reversal of the effect of DOACs. Preliminary results of a pivotal phase 3b/4 trial demonstrate a favorable efficacy and safety profile in patients with acute hemorrhage.

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