Regular blood tests are required if you take Warfarin in order to get your blood to be not too thick so that it will clot too easily and not too thin so that you clot less easily and as a result will suffer bleeding. You are likely to notice you bruise more easily.

Many patients with a condition called Atrial Fibrillation, which affects the rhythm, take Warfarin in order to reduce the high risk of having a Stroke. One in four people who have stroke have atrial fibrillation, taking warfarin reduces the risk.

Warfarin lowers the risk of blood clots forming in your body by thinning your blood, it is called anticoagulation.