In this Article
- What other names is Vitamin K known by?
- What is Vitamin K?
- How does Vitamin K work?
- Are there safety concerns?
- Are there any interactions with medications?
- Dosing considerations for Vitamin K.
Interaction Rating: Major Do not take this combination.
Vitamin K is used by the body to help blood clot. Warfarin (Coumadin) is used to slow blood clotting. By helping the blood clot, vitamin K might decrease the effectiveness of warfarin (Coumadin). Be sure to have your blood checked regularly. The dose of your warfarin (Coumadin) might need to be changed.
- For bleeding disorders such as hypoprothrombinemia: 2.5-25 mg of vitamin K1 (phytonadione).
- For counteracting bleeding that can occur when too much of the anticoagulant warfarin is given: 1-5 mg of vitamin K is typically used; however, the exact dose needed is determined by a lab test called the INR.
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