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How does Xarelto work to prevent and treat blood clots?

Xarelto (rivaroxaban) works by blocking one of several enzymes -- called factor Xa -- needed to form blood clots. It's used to reduce the risk of stroke in people with atrial fibrillation, a common heart rhythm disorder, and also to reduce the risk of a type of blood clot after knee or hip replacement surgery called a deep vein thrombosis (DVT). If a DVT breaks loose and travels through the bloodstream, it can cause serious and sometimes fatal problems.

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