Warfarin is an anticoagulant medicinal drug that acts by thinning the blood. The medication is externally administered.
It is widely used for treating blood clots such as deep vein thrombosis and pulmonary embolism, and hence, prevent serious medical conditions like stroke. It is also given to patients, as a deterrent measure, who have atrial fibrillation, valvular heart disease, a recent heart attack, or artificial heart valves as they have a higher risk of developing blood clots.
Warfarin may also be used following ST-segment elevation myocardial infarction (STEMI) and orthopedic surgery, and other purposes not mentioned here. To reverse the effects of warfarin phytonadione (vitamin K1), fresh frozen plasma or prothrombin complex concentrate may be used.