Warfarin is an anticoagulant used to prevent blood clots from forming or growing larger in your blood vessels. Often referred to by the misnomer “blood thinner,” anticoagulants, such as warfarin (or a brand of warfarin such as Coumadin®), help prevent clots from forming in the blood by decreasing the clotting ability of the blood.
Anticoagulants are prescribed for those at increased risk of developing harmful blood clots, including people who have experienced an irregular heartbeat or those with a mechanical heart valve. Your doctor may have also prescribed warfarin if you have experienced a stroke, heart attack, a clot that traveled to the lung, or a clot in the leg. People taking warfarin will need to test their blood on a regular schedule.