What is warfarin?
Warfarin is one of the oldest and most widely used anticoagulant medicines.
Sometimes it’s called a blood thinner — although this is not how warfarin actually works.
Warfarin works by increasing the time it takes for blood to clot. It is an anti-clotting (antithrombotic) medicine.
Warfarin is mainly used to prevent certain types of blood clots in people who are at risk of blood clots or who already have a blood clot (thrombus). Such clots can cause conditions such as stroke in people with atrial fibrillation, or venous thromboembolism (VTE) in people who’ve had certain surgical procedures. These conditions can be life-threatening if action is not taken to prevent them.
There are other kinds of anticoagulant medicines called non-vitamin K antagonist oral anticoagulants or NOACs.