Part Two of Warfarin Information, Focusing on Side Effects, Discontinuation or Withdrawal Effects, and Additional Information

This second section of our medication database entry focuses on potential side effects, withdrawal or discontinuation effects, and additional information, while part one covers basic drug characteristics, uses and benefits.

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What are the possible side effects of warfarin?

  • 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.
  • Other, less serious side effects may be more likely to occur. Talk to your doctor if you experience
    • excessive gas or bloating;
    • diarrhea, nausea, or vomiting;
    • hair loss; or
    • decreased appetite or weight.
  • Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.

What other drugs will affect warfarin?

  • Warfarin interacts with many other drugs, and these interactions can be dangerous, even fatal. Before starting treatment with warfarin, tell your doctor and pharmacist about all medicines you take including prescription medicines, over-the-counter products, vitamins, minerals, and herbal products. Talk to your doctor and pharmacist before taking any other medication during treatment with warfarin.

Where can I get more information?

  • Your pharmacist has additional information about warfarin written for health professionals that you may read.
  • Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Limitations and the Source of Our Online Medication Information Database

Although we have made considerable efforts to ensure that the information provided here is accurate, up-to-date, and complete, MedLibrary.org makes no guarantee to that effect. Drug information contained herein may be time sensitive. This medication information does not endorse drugs, diagnose patients or recommend any specific pharmacotherapy. This is an educational resource only -- intended to supplement but not to replace the expertise, skill, knowledge and judgment of medically qualified healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, please check with your doctor, nurse or local pharmacist. MedLibrary.org does not assume any responsibility for any aspect of healthcare administered with the aid of information provided here.

Full public license and copyright information is available separately from Cerner Multum, Inc.

Version: 8.01. Revision date: 5/13/03.

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