Fesomersen, formerly known as IONIS-FXI-LRx, is an investigational LIgand-Conjugated Antisense (LICA) medicine designed to inhibit the production of Factor XI. Factor XI is a clotting factor produced in the liver that is important in the growth of blood clots.

About Thrombotic Disorders

Thrombosis, characterized by the formation of a blood clot inside blood vessels, can cause heart attacks and strokes. People who are deficient in Factor XI have a lower incidence of thromboembolic events with minimal increase in bleeding risk. Although currently available anticoagulants reduce the risk of thrombosis, physicians associate these anticoagulants with increased bleeding, which can be fatal. By inhibiting Factor XI production, fesomersen has the potential to be used for the treatment of a number of non-acute forms of thrombotic disorders where additional safe and well tolerated anti-thrombotic medicines are needed.

Safety and efficacy have not been evaluated by any regulatory authorities for the indication described.

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