Vitamin K Administration Guidelines

Dosing Considerations

The American College of Chest Physicians recommends that vitamin K (phylloquinone) has similar bioavailability when administered via IM or IV routes, so the dose remains the same at 10 mg for both routes 1, 2
The choice between IM and IV administration is typically based on clinical context rather than dose adjustment requirements 2
For urgent reversal of vitamin K antagonist anticoagulation in patients with major bleeding or requiring emergency procedures, 10 mg of vitamin K (IV or IM) is recommended, typically administered alongside other reversal agents such as prothrombin complex concentrates (PCCs) in life-threatening bleeding scenarios 1, 3

IV administration provides more rapid onset but carries a small risk of anaphylaxis (3 in 100,000 patients) 1
IM administration has a slightly slower onset but avoids the risk of anaphylactic reactions associated with IV administration 1
When administered IV, vitamin K should be infused slowly to minimize the risk of adverse reactions 1

For pediatric patients, dosing is weight-based (10 μg/kg/day for infants up to 12 months, 200 μg/day for older children) rather than using adult fixed dosing 4, 5
In patients with liver disease, vitamin K administration alone typically has only a minor impact on prothrombin time and may take >12 hours to start correcting hemostatic defects 2, 6

Subcutaneous (SC) administration of vitamin K should be avoided as it results in significantly lower bioavailability compared to IM or IV routes 1
Vitamin K alone is insufficient for immediate reversal of anticoagulant-related bleeding and should be combined with prothrombin complex concentrates or fresh frozen plasma in emergency situations 1, 3
The full effect of vitamin K administration takes more than 12 hours, making it unsuitable as a sole agent for emergency reversal of anticoagulation 2