Tags: Coumadin, Food, Vitamin K

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Maintaining a proper diet while taking Coumadin (also known as Warfarin) is very important. By monitoring your intake, you will be able to have more stable INR tests. Listed below are important Coumadin diet restrictions.

Vitamin K


It is important to keep in mind that consistency is key when regulating your Coumadin diet. Unless your doctor instructs you to, you should not try to omit all Vitamin K from your diet. Vitamin K foods are important to the overall health of your body by strengthening bones and improving the health of your arteries.1

Vitamin K is Coumadin's antidote so managing your intake is an important factor in staying therapeutic. Some foods that have high Vitamin K include:

  • Cabbage
  • Broccoli
  • Spinach
  • Escarole
  • Turnip Greens
  • Lettuce
  • Brussels Sprouts
  • Endive
  • Kale
  • Cauliflower
You can find the Vitamin K content in over 4,500+ foods and easily document your Coumadin diet by signing up for a free account at INR Tracker. Learn more or .


Alcohol may impact your INR, however, it is not usually necessary for you to avoid consuming it (consult your doctor). It is recommended that you drink no more than 1-2 glasses of alcohol a day. Two major reasons why is because both Coumadin and alcohol are absorbed using the liver, which may have a temporary reduction in function from alcohol. Also, consuming alcohol can greatly impair judgment and may increase chances of injuries that could cause excessive bleeding.2

Drugs & Herbal Supplements

Many drugs will interact with Warfarin. The lists below are some of the most commonly used drugs and supplements that may interact with Coumadin. You should always inform your doctor when you start or stop any medicines or supplements.

Common Over-the-Counter Drugs3

  • Asprin
  • Aleve
  • Motrin
  • Ibuprofen
  • Cimetidine (Tagamet)
  • Ranitidine (Zantac)
  • Pepto Bismol
  • Vitamin C
  • Vitamin E
  • Multivitamins
  • Glucosamine & Chondroitin
  • Coenzyme Q10

Common Prescription Drugs3

  • Antibiotics
  • Analgesics
  • Anticonvulsants
  • Antidepressants
  • Antiplatelet drugs
  • Diabetes drugs
  • Gastrointestinal drugs
  • Gout treatment drugs
  • Lipid-lowering drugs
  • Steroids
  • Thyroid drugs
  • Antifungal drugs

Common Herbal Supplements3

  • Alfalfa
  • Agrimony
  • Aloe gel
  • Angelica (Dong Quai)
  • Aniseed
  • Arnica
  • Asafoetida
  • Aspen
  • Black cohosh
  • Black haw
  • Bladderwrack
  • Bogbean
  • Boldo
  • Capsicum
  • Cassia
  • Celery
  • Chamomile
  • Clove
  • Dandelion
  • Fenugreek
  • Feverfew
  • German sarsaparilla
  • Ginseng (Panax)
  • Goldenseal
  • Horse chestnut
  • Horseradish
  • Licorice
  • Meadowsweet
  • Mistletoe
  • Nettle
  • Onion
  • Parsley
  • Passion flower
  • Pau d'arco
  • Policosanol
  • Poplar
  • Prickly ash (Northern)
  • Quassia
  • Red clover
  • Senega
  • Sweet clover
  • Sweet woodruff
  • Tamarind
  • Tonka beans
  • Wild carrot
  • Wild lettuce
  • Willow
  • Wintergreen
  • Yarrow

Diet Tracking

You can keep track of your Coumadin, Diet / Vitamin K, and INRs here on INR Tracker for Free. Learn more or .

  1. Vermeer, Cees. PUBMED, "Vitamin K: the effect on health beyond coagulation – an overview." Last modified April 02, 2012. Accessed April 23, 2012.
  2. Anselmo, Lisa, and Edward Libby. National Blood Clot Alliance, "Bleeding and Clotting Disorders." Last modified Nov 17, 2008. Accessed April 23, 2012.
  3. NYU Medical Center, "Managing Your Warfarin (Coumadin®) Therapy A Patient's Guide." Last modified March, 2002. Accessed April 23, 2012.
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