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Warfarin (Coumadin)

Warfain (Coumadin) is an anticoagulat or “blood thinner” medication that is prescribed to prevent harmful blood clots from forming in the body. This medication is used to help decrease the risk of stroke, heart attack, and deep vein thrombosis.

Side Effects 

The most common side effect of Warfarin is bleeding. Signs of unusual bleeding include

  • Bleeding from the gums

  • Blood in the urine

  • Dark stool/stool with visible blood

  • Nose bleed

  • Vomitting blood


When to Call Your Provider or 911

  • Severe headache, confusion, weakness

  • Coughing/Vomitting blood

  • Visible red blood in the stool

  • Bleeding that will not stop

  • After any injury or fall especially if you hit your head

  • If there is any chance you may be pregnant​

What Should I Do While Taking Warfarin?


  • Monitor for signs of bleeding

  • Take your medicine only as prescribed

  • Have your INR checked regularly

  • Notify any providers including your dentist that you take Warfarin

  • Notify your provider if you fall or get injured

  • If you are traveling always carry your medicine with you, not in your luggage


What Should I NOT Do While Taking Warfarin?


  • Never double your dose because you missed the last one

  • Do not start new medications or change Warfarin dose without checking with your provider

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