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, an enzyme involved in blood clot formation. Offers predictable response, allowing fixed dosing without routine blood monitoring. Taken orally, making it an alternative to injectable anticoagulants.