Warfarin
Coumadin (warfarin) is a prescription anticoagulant, commonly known as a blood thinner, that helps prevent the formation of dangerous blood clots. It is used to reduce the risk of stroke, deep vein thrombosis, and pulmonary embolism in patients with certain heart conditions or clotting disorders. Regular blood monitoring is required to ensure proper dosing.
Coumadin is a blood thinner used to prevent and treat blood clots in conditions like atrial fibrillation, deep vein thrombosis, and pulmonary embolism.
Key facts at a glance
- RxNorm
- 202421
- Generic
- Coumadin
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Coumadin is used to treat and prevent blood clots in conditions such as atrial fibrillation, deep vein thrombosis (DVT), pulmonary embolism, and in patients with mechanical heart valves. It may also be used to prevent recurrent strokes in certain patients.
Coumadin is a vitamin K antagonist that interferes with the body's ability to use vitamin K to produce clotting factors. By inhibiting these clotting factors, it helps prevent existing clots from growing larger and reduces the risk of new clots forming.
Regular blood tests (INR) are essential to monitor the medication's effect and adjust dosing. Many drug and food interactions exist, particularly with vitamin K-rich foods. Patients should avoid activities that increase bleeding risk and must inform healthcare providers before any procedures or surgeries.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed July 26, 2026. · Read our editorial policy