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Question:
I take warfarin (Coumadin), an anticoagulant drug. Are there supplements I should avoid, or be taking, due to this drug?

Answer:
Yes, the effectiveness of warfarin (Coumadin), anisindione (Miradon) and other anticoagulant drugs prescribed to help prevent blood clots can be impacted by taking supplements.  This is discussed in detail in the Warfarin article, which is part of the extensive Drug Interactions section of our website (where you can look up interactions for other drugs you may be taking).

Examples of supplements which may increase warfarin’s blood-thinning effect (and, consequently, the risk of abnormal bleeding) are garlic, gingko and curcumin. Examples of supplements which may reduce warfarin’s ability to thin the blood include vitamin K, ginseng, St. John’s wort, and, in very high doses, green tea. CoQ10 is chemically similar to vitamin K2 and may also decrease the effects of warfarin, although the evidence for this is mixed. Because it can be affected by a large number of herbs, supplements and foods, it's important to consult your physician before taking any supplement with warfarin.


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COMMENTS

Michael W11376   November 7, 2016
I take coumadin, and vitimain K and eat spinich/green salad almost every day. . The coumadin is adusted to my diet and the way to accomplish this is to be consistant with what I eat. I have to take a larger does of counadin to offset my green leaf salads and vitimin K intake then someone else who dies not take vit K and eat greens. , but I as long as I am reasonably consistant with my diest my numbers are good.

Donald8548   March 24, 2016
I take warfarin because of A-Fib. I also take Co-Q10, Fish Oil, turmeric and use garlic and my last 6 INR's have been 2.3, 2.4, 2.4, 2.4, 2.2, 2.3. No problem, also eat broccoli, kale, and spinach.


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This CL Answer initially posted on 6/2/2014. Last updated 8/8/2017.
ConsumerLab.com members may submit questions to CLAnswers@ConsumerLab.com. We read all questions and try to answer those of popular interest.

 
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