American Journal of Cardiovascular Drugs

, Volume 4, Issue 1, pp 43–55 | Cite as

The Use of Vitamin K in Patients on Anticoagulant Therapy

A Practical Guide
  • Thomas HanslikEmail author
  • Jacques Prinseau
Therapy In Practice


Anticoagulation with antivitamin K (AVK) is very effective for primary and secondary prevention of thromboembolic events. However, questions persist about the risks and management of over-anticoagulation. For reversal of excessive anticoagulation by warfarin, AVK withdrawal, oral or parenteral vitamin K administration, prothrombin complex or fresh frozen plasma may be used, depending on the excess of anticoagulation, the existence and site of active bleeding, patient characteristics and the indication for AVK. In over-anticoagulated patients, vitamin K aims at rapid lowering of the international normalized ratio (INR) into a safe range to reduce the risk of major bleeding and therefore improving patient outcome without exposing the patient to the risk of thromboembolism due to overcorrection, resistance to AVK, or an allergic reaction to the medication.

The risk of bleeding increases dramatically when the INR exceeds 4.0–6.0, although the absolute risk of bleeding remains fairly low, <5.5 per 1000 per day. Patient characteristics, including advanced age, treated hypertension, history of stroke, and concomitant use of various drugs, affect the risk of bleeding. The absolute risk of thromboembolism associated with overcorrection appears to be in the same range as the risk of bleeding due to over-anticoagulation. The use of vitamin K in patients with warfarin over-anticoagulation lowers excessively elevated INR faster than withholding warfarin alone; however, it has not been clearly demonstrated that vitamin K treatment does, in fact, lower the risk of major hemorrhage.

As vitamin K administration via the intravenous route may be complicated by anaphylactoid reactions, and via the subcutaneous route by cutaneous reactions, oral administration is preferred. A dose of 1–2.5mg of oral phytomenadione (vitamin K1), reduces the range of INR from 5.0–9.0 to 2.0–5.0 within 24–48 hours, and for an INR >10.0, a dose of 5mg may be more appropriate. Overcorrection of the INR or resistance to warfarin is unlikely if the above doses of vitamin K are used. Vitamin K is less effective for over-anticoagulation after treatment with acenocoumarol or phenprocoumon than after treatment with warfarin.


Warfarin International Normalize Ratio Major Hemorrhage Warfarin Therapy Phenprocoumon 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



We are grateful to Shéhérazade Ouaret, MD, of the French Health Security Agency, AFSSAPS, for her help in collecting national pharmacovigilance information. No sources of funding were used to assist in the preparation of this manuscript. The authors have no conflicts of interest that are directly relevant to the content of this manuscript.


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© Adis Data Information BV 2004

Authors and Affiliations

  1. 1.Department of Internal MedicineAmbroise Paré Hospital, Assistance Publique-Hôpitaux de ParisParisFrance
  2. 2.Université de VersaillesSaint-Quentin-en-YvelinesFrance

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