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Warfarin side effects: Watch for interactions

What foods and drinks might interact with warfarin?

Foods and drinks that might interact with warfarin include:

  • Cranberries or cranberry juice
  • Alcohol
  • Foods that are high in vitamin K, such as soybean and canola oils, spinach and broccoli
  • Garlic
  • Black licorice

Your doctor might recommend keeping the level of vitamin K in your diet consistent rather than avoiding vitamin K-rich foods altogether.