Used as an anticoagulant to prevent blood clots, particularly in patients with atrial fibrillation to reduce the risk of stroke. It is also prescribed after hip or knee replacement surgery to prevent deep vein thrombosis and pulmonary embolism. Works by directly inhibiting thrombin, a key enzyme in the blood clotting process. Offers predictable response without routine blood monitoring, making it convenient for long-term use compared to older anticoagulants.