The aim of the study was to make a preliminary assessment of the efficacy and safety of acute deep vein thrombosis (DVT) prolonged treatment with new oral anticoagulant rivaroxaban. Materials and methods. It was a prospective observational study included patents with instrumentally verified DVT admitted to the Department of Vascular Surgery of the Clinical Hospital n.1 President's Administration of Russian Federation. All patients were administrated to the initial treatment with low-molecular weight heparins during first 24-48 hours followed by overlapped therapy with vitamin-K-antagonists. Patients who rejected a standard therapy were offered an alternative oral anticoagulant rivaroxaban: 15 mg bid during first 3 weeks followed by 20 mg qd. The duration of therapy varied from 3 to 12 month and more depend on localization and clinical provocation of the thrombosis. The dynamic control was performed on 3rd, 6th, 9th and 12th month. The endpoints of the study were recurrent DVT verified with duplex ultrasound or pulmonary embolism (PE) and hemorrhagic complications. In the study were enrolled 30 patients aged 27-87 years (mean age - 59.0±16.8), 13 men and 17 women who had from 0 to 6 individual risk factors (average - 2.4±1.6). In 33.3% cases DVT was clinically provoked and in 66.7% - unprovoked. Results. There were no recurrent DVT or PE observed. Cumulative rate of bleeding was 13.3% (95% CI: 1.2-25.5%): 6.65% (95% CI: 1.8-21.3%) - minor bleeding , that did not need drug withdrawal or extra visit to the doctor, and 6.65% (95% CI: 1.8-21.3%) - clinically significant bleeding, that needed an unscheduled visit to the doctor, the temporary interruption of the therapy or medical intervention. Major bleeding were not identified. Bleeding were presented as hematuria, petechial skin hemorrhages and epistaxis. Conclusion. The study demonstrates feasibility and safety of the new oral anticoagulant rivaroxaban application in the prolonged treatment of acute DVT.