A Phase 3 Randomized, Double-Blind, Parallel-group, Multi-center Study of the Safety and Efficacy of Apixaban for Prophylaxis of Venous Thromboembolism in Acutely Ill Medical Subjects During and Following Hospitalization.

The purpose of this study is to learn if apixaban can prevent blood clots in the leg (deep vein thrombosis \[DVT\]) and lung (pulmonary embolism \[PE\]) that sometimes occur within patients hospitalized for acute medical illness, and to learn how apixaban compares to enoxaparin (Lovenox®) for preventing these clots. The safety of apixaban will also be studied.