Warfarin and vitamin K
Can I take warfarin with vitamin K?
Warfarin and vitamin K require consistent intake and clinician-directed monitoring. Sudden vitamin K changes can affect anticoagulation control.
Last reviewed: June 12, 2026
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Source boundary
This preview links the selected warfarin label, RxNorm identity, FDA approval context, and NIH ODS vitamin K fact sheet. It does not adjust warfarin dose or diet.
Clinical boundary
Warfarin users should ask their anticoagulation clinic, prescriber, or pharmacist before changing vitamin K intake, supplements, or diet patterns.
FAQ preview
Should a warfarin user stop vitamin K foods?
This preview should not tell users to stop foods. It emphasizes consistency and clinician-directed monitoring.
Why does INR matter?
Warfarin effect is monitored with INR, so sudden diet or supplement changes should be reviewed by the care team.
Is a vitamin K supplement different from food?
Both can matter for a warfarin user, so supplement starts, stops, or dose changes should be reviewed before use.