Description: Why is Buy Xarelto 20 mg prescribed? Rivaroxaban is used to treat deep vein thrombosis (DVT; a blood clot, usually in the leg) and pulmonary embolism. Rivaroxaban may be continued to prevent DVT and/or PE from happening again after initial treatment is completed. It is also used to help prevent strokes or serious blood clots in people who have atrial fibrillation without heart valve disease.