Anticoagulants are medications that help prevent the coagulation (clotting) of blood. They are often prescribed to individuals with conditions such as atrial fibrillation, deep vein thrombosis, and pulmonary embolism. Common anticoagulants include Warfarin, Heparin, and newer agents like Direct Oral Anticoagulants (DOACs), which include drugs like apixaban and rivaroxaban.