Which of the following medications is classified as an anticoagulant?

Warfarin is classified as an anticoagulant because it works by inhibiting vitamin K-dependent clotting factors in the liver, which ultimately reduces the blood's ability to clot. This makes Warfarin essential in the prevention and treatment of thromboembolic disorders such as deep vein thrombosis and atrial fibrillation. By interfering with the synthesis of specific proteins crucial for blood coagulation, it helps maintain normal blood flow and reduce the risk of dangerous clots forming in the bloodstream.

In contrast, the other medications listed serve different purposes: Atorvastatin is a statin used to lower cholesterol levels, Metformin is an antidiabetic medication for managing type 2 diabetes, and Clindamycin is an antibiotic used to treat bacterial infections. None of these medications possess anticoagulant properties, emphasizing the unique role of Warfarin in managing blood coagulation.