Coumadin Side Effects

If you experience any of the following serious side effects from warfarin, stop taking the medication and seek emergency medical attention or contact your doctor immediately:

  • an allergic reaction (difficulty breathing; closing of the throat; swelling of the lips, tongue, or face; or hives);
  • black, bloody, or tarry stools;
  • blood in urine or vomit;
  • coughing up blood;
  • bleeding gums or sores in the mouth;
  • decreased urine production;
  • yellowing of the skin or eyes;
  • severe dizziness or headache;
  • easy bleeding or bruising under the skin;
  • purple discoloration of the toes or fingers;
  • sudden leg or foot pain; or
  • unusually heavy menstrual periods.


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