Which medication is used as an anticoagulant to prevent blood clots?

Warfarin is an anticoagulant medication specifically used to prevent the formation of blood clots. It works by inhibiting vitamin K-dependent clotting factors in the liver, which are essential for blood coagulation. By reducing the blood's ability to clot, warfarin helps in the prevention of thromboembolic events such as deep vein thrombosis (DVT) and pulmonary embolism (PE), especially in individuals who have certain risk factors, such as atrial fibrillation or a history of clotting disorders.

Aspirin, while it does have a blood-thinning effect, primarily works by inhibiting platelets and is often classified as an antiplatelet rather than a true anticoagulant. Ibuprofen and acetaminophen are both nonsteroidal anti-inflammatory drugs (NSAIDs) and analgesics that reduce pain and inflammation but do not have anticoagulant properties. Therefore, warfarin is the appropriate choice for anticoagulation therapy.