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Health Conditions

Drug Interactions

Due to the fact that warfarin interacts with many commonly used medications and medication ingredients, it is important that you inform your doctor or pharmacist about any new prescription and non-prescription medications, supplements, vitamins, and herbals that you may be taking.

Some common interacting drugs include:

  • acetaminophen
  • medications that dissolve blood clots
  • medications that lower cholesterol
  • alcohol
  • allopurinol
  • amiodarone
  • antibiotics or medicines for treating bacterial, fungal or viral infections
  • antiinflammatory drugs, NSAIDs, such as ibuprofen
  • aprepitant
  • aspirin
  • azathioprine
  • barbiturate medicines for inducing sleep or treating seizures
  • bosentan
  • cimetidine
  • cyclosporine
  • disulfiram
  • female hormones, including contraceptive or birth control pills
  • fish oil (omega-3 fatty acids) supplements
  • herbal products such as danshen, garlic, ginkgo, ginseng, green tea, or kava kava
  • influenza virus vaccine
  • male hormones
  • medicines for some types of cancer
  • certain medicines for heart rhythm problems
  • certain medicines for high blood pressure
  • quinidine, quinine
  • seizure or epilepsy medicine such as carbamazepine, phenytoin, and valproic acid
  • testolactone
  • thyroid medicine
  • tolterodine
  • vitamin K (including vitamin, mineral, and food supplements that contain vitamin K)

You can also check if the medication you are currently taking interacts with warfarin by using our drug interaction checker.

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Note: The above information is intended to supplement, not substitute for, the expertise and judgment of your physician, pharmacist, or other healthcare professional. It is not intended to diagnose a health condition, but it can be used as a guide to help you decide if you should seek professional treatment or to help you learn more about your condition once it has been diagnosed.



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