2- Anticoagulant medications

Anticoagulant medicines like warfarin (Coumadin), warfarin substitutes, or aspirin can lower your risk of blood clotting and stroke but do not eliminate the risk.
When taking Coumadin, blood tests are performed regularly to assess its effectiveness. Regular blood tests are not required if you are using a warfarin substitute.
Consult your doctor to determine which anticoagulant medicine is best for you.