Warfarin Toxicity


4.7 out of 5 (22 Reviews)



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Start Date

1 Sep 2023

Last Review Date

1 Sep 2023

Expiration Date

31 Aug 2026

Estimated Time To Finish

90 Minutes

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Activity Description

Warfarin is a vitamin K antagonist used as an anticoagulant used for treatment and prevention of a variety of coagulopathic and thromboembolic disorders. While it was initially marketed as a rodenticide, it has been used as a medication for more than a half-century. Superwarfarins are now also used as pesticides and should be recognized as having potential to cause warfarin toxicity. They are one hundred times more potent than warfarin. Toxicity can occur due to intentional overdose, unintentional overdose, and pediatric ingestion. Intentional overdose has been noted to be relatively rare; a 25-year long survey involving 2 tertiary care centers with toxicology services reported a total of 22 intentional overdoses in adults. Unintentional overdose or toxicity can occur through various mechanisms such as during the initial dose titration phase, with changes in diet that affect the medication potency, due to interactions with other medications, or secondary to metastatic liver disease. This activity describes the pathophysiology of warfarin toxicity and highlights the role of the interprofessional team in its management.

Target Audience

This activity has been designed to meet the educational needs of physicians, physician associates, nurses, pharmacists, and nurse practitioners.

Learning Objectives

At the conclusion of this activity, the learner will be better able to:

  • Describe the presentation of a patient with warfarin toxicity.
  • Summarize the causes of warfarin toxicity.
  • Outline the treatment options for warfarin toxicity.
  • Explain the importance of improving care coordination amongst interprofessional team members to improve outcomes for patients affected by warfarin toxicity.


StatPearls, LLC requires everyone who influences the content of an educational activity to disclose relevant financial relationships with ineligible companies that have occurred within the past 24 months. Ineligible companies are organizations whose primary business is producing, marketing, selling, re-selling, or distributing healthcare products used by or on patients. All relevant conflict(s) of interest have been mitigated. Hover over contributor names for financial disclosures. Others involved in planning this educational activity have no relevant financial relationships to disclose.

Commercial Support: This activity has received NO commercial support.

Continuing Education Accreditation Information

In support of improving patient care, StatPearls, LLC is jointly accredited by the Accreditation Council for Continuing Medical Education (ACCME), the Accreditation Council for Pharmacy Education (ACPE), and the American Nurses Credentialing Center (ANCC) to provide continuing education for the healthcare team.


Nurses: StatPearls designates this activity for 1.50 ANCC contact hour(s). Nurses should only claim credit commensurate with the extent of their participation in the activity.

Please consult your professional licensing board for information on the applicability and acceptance of continuing education credit for this activity.

Method of Participation and Credit

  1. Register for the activity.    
  2. Review the target audience, learning objectives, and disclosure information.
  3. Study the educational content of the enduring material.
  4. Choose the best answer to each activity test question. To receive credit and a certificate, you must pass the test questions with a minimum score of 100%.
  5. Complete the post-activity assessment survey.

If you have concerns regarding the CE/CME system, please contact support@statpearls.com.


This educational activity was planned and produced in accordance with the ACCME Standards for Integrity and Independence in Accredited Continuing Education. Faculty may discuss investigational products or off-label uses of products regulated by the US Food and Drug Administration. Readers should verify all information before employing any therapies described in this educational activity.

The information provided for this activity is for continuing education purposes only and is not meant to substitute for the independent medical/clinical judgment of a healthcare provider relative to diagnostic and treatment options of a specific patient’s medical condition. The information presented does not necessarily reflect the views of StatPearls or any commercial supporters of educational activities on statpearls.com. StatPearls expressly disclaims responsibility for any adverse consequences resulting directly or indirectly from information in the course, for undetected error, or through a participant's misunderstanding of the content.

Unapproved Uses of Drugs/Devices: In accordance with FDA requirements, the audience is advised that information presented in this continuing education activity may contain references to unlabeled or unapproved uses of drugs or devices. Please refer to the FDA-approved package insert for each drug/device for full prescribing/utilization information.

Cancellation Policy: Please see the cancellation policy. StatPearls, LLC reserves the right to cancel any course due to unforeseen circumstances.




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