Vitamin K and Warfarin

Warfarin is a drug that helps thin your blood. If you take warfarin, you will need to follow a diet that has a consistent amount of vitamin K-containing foods. Sudden changes in the amount of vitamin K that you eat can cause the medicine to not work as well as it should. You do not need to avoid vitamin K-containing foods.

FOODS HIGH IN VITAMIN K

  • Broccoli, fresh or frozen, cooked, 1 cup

  • Greens, fresh or frozen, cooked (beet, collard, mustard, turnip), ½ cup

  • Kale, fresh or frozen, cooked, ½ cup

  • Parsley, raw, 10 sprigs

  • Spinach, frozen or canned, cooked, ½ cup

FOODS MODERATELY HIGH IN VITAMIN K

  • Bok choy, cooked, 1 cup

  • Broccoli, raw, 1 cup

  • Brussels sprouts, fresh or frozen, cooked, ½ cup

  • Cabbage, cooked, 1 cup

  • Endive, raw, 1 cup

  • Green leaf lettuce, raw, 1 cup

  • Green scallions, raw, ¼ cup

  • Okra, frozen, cooked, 1 cup

  • Romaine lettuce, raw, 1 cup

  • Sauerkraut, canned, 1 cup

  • Spinach, raw, 1 cup

KEEPING YOUR INTAKE CONSISTENT

  • Note the foods that are high in vitamin K listed above. How many times per week do you eat these foods?

  • For example, you mighteat cooked broccoli 1 time a week and a leafy green salad 3 times a week. In that case, you should have 1 high vitamin K food each week and 3 moderately high foods each week.

  • Remember, you do not need to eat the same foods each week. Try to keep your vitamin K intake levels about the same.

MORE TIPS

  • Take your warfarin as instructed.

  • It is okay to take a multivitamin that contains vitamin K. Just be sure to take it every day.

  • Avoid taking herbs unless approved by your caregiver.

  • Discuss any supplements or whole food supplements with your pharmacist.

  • If you drink alcohol, drink only in moderation while taking warfarin. If approved by your caregiver, have only 1 to 2 drinks per day. One drink = 5 oz of wine, 12 oz of beer, or 1 ½ oz of hard liquor.