Warfarin is a blood thinner (anticoagulant) medicine. It is used to keep clots from forming in your blood. When you take warfarin, you may bruise easily. You may also bleed a little longer if you cut yourself.

Before taking warfarin, tell your doctor if:

  • You take any other medicine for your heart or blood pressure.

  • You are pregnant.

  • You plan to get pregnant.

  • You are breastfeeding.

  • You are allergic to any medicine.


  • Take warfarin as told by your doctor. Do not stop the medicine unless your doctor tells you to.

  • Take your medicine at the same time every day.

  • Do not take anything that has aspirin in it unless your doctor says it is okay.

  • Do not drink alcohol.

  • Tell all your doctors and dentists that you are taking warfarin before they treat you or give you any medicines.

  • Keep all your appointments for doctor visits and blood tests.

  • Keep warfarin out of reach of children. Do not share warfarin with anyone.

  • Eat about the same amount of vitamin K foods every day.

  • High vitamin K foods: Beef liver. Pork liver. Green tea. Broccoli. Brussels sprouts. Cauliflower. Chickpeas. Kale. Spinach. Turnip greens.

  • Medium vitamin K foods: Chicken liver. Pork tenderloin. Cheddar cheese. Rolled oats. Coffee. Asparagus. Cabbage. Iceberg lettuce.

  • Low vitamin K foods: Apples. Butter. Bananas. Skim or 1% milk. Orange rice. Canned pears. White bread. Strawberries. Corn. Tomatoes. Green beans. Eggs. Potatoes. Bacon. Pumpkin. Chicken breasts. Ground beef. Oil (except soybean oil).


  • You miss a dose of warfarin. Do not take 2 doses at the same time.

  • You have a skin rash.

  • You have heavy or unusual bleeding.

  • There is blood in your pee (urine) or poop (stool).

  • You have side effects from medicine that do not get better after a few days.


  • Understand these instructions.

  • Will watch your condition.

  • Will get help right away if you are not doing well or get worse.