Fondaparinux is an anticoagulant medication used to prevent and treat blood clots. It works by inhibiting a specific factor in the blood clotting process, which helps reduce the risk of conditions like deep vein thrombosis (DVT) and pulmonary embolism (PE). This medication is often prescribed after surgeries or for patients with certain medical conditions that increase the risk of clot formation. Fondaparinux is typically administered via injection and is known for its predictable effects, making it easier to manage compared to some other anticoagulants.