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Which foods and drugs interact with blood thinning medications?

Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
The following list provides the most common and easily avoided sources of adverse drug reactions concerning blood thinning medications. Keep this list handy and review it whenever you bring home a new prescription for a blood thinner - even after your doctor and pharmacist have vetted it with you.
  • Warfarin interacts with antibiotics such as clarithromycin or erythromycin. Can increases the effect of warfarin to cause bleeding.
  • Warfarin interacts with feverfew, ginseng, dan-shen, ginkgo biloba, garlic, and other herbals (especially those that start with a "g", for an easy way to remember). May increase the effect of warfarin to cause bleeding.
  • Warfarin interacts with spinach, liver and leafy greens. Large quantities of vitamin K may decrease the effects of warfarin, causing blood clots.
  • Warfarin interacts with miconazole (found in over-the-counter yeast infection treatments). May increase risk of bleeding and bruising.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.