To help lower the chances of clots, your doctor may prescribe a more powerful blood thinner called an anticoagulant, especially if you have high blood pressure, diabetes, or heart failure. The most common is warfarin (Coumadin). It can cut your risk of stroke, but you'll have to get your blood tested often, and you'll have to be careful to avoid cuts or other injuries. Some foods can make warfarin less effective, too. If you need a procedure, dental work, or surgery, it might be necessary to stop the blood thinner. It's important to let all your doctors know you are taking a blood thinner just in case.