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Anticoagulation Services
Modified: Friday, July 20, 2007

CORRECTION OF OVER-ANTICOAGULATION

Guidelines For Correction of Warfarin Over-Anticoagulation

Adapted from Ansell J et al.  Chest 2004; 126 (suppl 3): 204-233

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INR
CLINICAL SETTING
THERAPEUTIC OPTIONS
< 5
No bleeding

Hold warfarin until INR in therapeutic range +/- vitamin K  2.5mg po

Rapid reversal required

Hold warfarin and give vitamin K 1mg IV infusion or 2.5mg po

5.0-8.9
No bleeding

Hold warfarin until INR in therapeutic range +/- vitamin K  2.5mg po

Rapid reversal required

Hold warfarin and give vitamin K 1-2mg IV infusion or 2.5-5mg po

> 9
No bleeding

Hold warfarin until INR in therapeutic range and give vitamin K 2.5-5mg po or 1-2mg IV and may repeat q24h as necessary

Rapid reversal required

Hold warfarin and give vitamin K 1-10mg IV  and may repeat q6-24h as necessary

Any INR
Serious or life threatening bleeding

Hold warfarin and give vitamin K 10mg IV infusion and supplement with FFP or PPC or recombinant VIIa and repeat as necessary guided by INR

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