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Warfarin - Side effects of warfarin

NHS Choices Medical Reference

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It is important to check for bleeding (haemorrhages) when taking warfarin as anticoagulant medication can cause excessive bleeding.

You must seek medical attention and have an urgent blood test if you experience any of the following:

  • passing blood in your urine or faeces
  • passing black faeces
  • severe bruising
  • long nosebleeds (lasting longer than 10 minutes)
  • bleeding gums
  • blood in your vomit or coughing up blood
  • unusual headaches
  • (in women) heavy or increased bleeding during your period, or any other bleeding from the vagina

You must seek immediate medical attention if you:

  • are involved in a major accident
  • experience a significant blow to the head
  • are unable to stop any bleeding

Less common side effects

Less common side effects of warfarin include:

See your GP immediately if you experience jaundice (yellowing of the skin and whites of the eyes) or any persistent side effects while taking warfarin.

Medical Review: March 22, 2012
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