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Coumarin is an organic compound that is found in nature, in many plants. It is in the chemical class of benzopyrones. Coumarin has a long history, isolated by researchers nearly two hundred years ago, and it has a wide variety of uses though one of its greatest uses is in the production of synthetic anticoagulant pharmaceuticals that work to prevent blood clots.

How to Use Coumarin

Coumarin, as a primary ingredient in various drugs, is typically given orally. Follow your doctor's directions on usage and dosage. If you are prescribed a coumarin drug, do not stop taking it as prescribed unless you have your doctor's approval to do so.

Possible Side Effects

Many different side effects could be experienced with coumarin; though it is entirely possible users may encounter no side effects. Some of the more commonly seen are as follows:

  • Nausea
  • Blurry Vision
  • Diarrhea
  • Loss of Appetite

If any of the above or possibly other side effects are experienced, seek medical attention if you feel it is warranted, or if any side effects you experience get worse or do not seem to be going away/lingering longer.

If you experience any of the following side effects consult with your doctor right away or seek emergency medical assistance:

  • Severe Headaches
  • Blood in Urine
  • Blood in Stool
  • Unusual Bruising
  • Unusual Bleeding

Severe allergic reactions are rare, but can occur. Watch for any signs of potentially severe allergic reactions and seek emergency medical attention right away if you experience any of the following:

  • Itching and/or Swelling
  • Trouble Breathing
  • Severe Dizziness
  • Rash


This drug is strictly contraindicated during pregnancy.

Do not take this drug if you are breastfeeding or planning to breastfeed unless expressly approved by your doctor after a full medical review with her or him.

Additionally there is a very long list of many and various diseases, conditions, etc. that use of the drug may be unwise or contraindicated. Anyone considering the use of coumarin should have a full medical workup and consultation with their doctor before any use of the drug whatsoever.

  • "It is rare to find health professionals who are so willing to educate the patient on what they need to know."

    Clair C. | West Hollywood, CA