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Interazioni tra farmaci

Vitamin k1 + Warfarin

Gravità: Maggiore

Vitamin k1 and Warfarin: major interaction.

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Sintesi

Vitamin K1 directly antagonizes warfarin and reduces INR, leading to loss of anticoagulation. This is used therapeutically for reversal but can cause unintended resistance with supplements.

Cosa significa questa interazione in parole semplici

Vitamin k1 and Warfarin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.

Vitamin k1 belongs to Cardiovascular; Warfarin belongs to Cardiovascular.

Livello di evidenza: High

Perché avviene

Vitamin K1 restores synthesis of clotting factors II, VII, IX and X, opposing warfarin's inhibition of VKOR.

Cosa fare

Keep vitamin K intake consistent and monitor INR whenever dosing changes; when used for reversal, titrate dose to INR and bleeding status.

Cosa chiedere al farmacista

  • Does the benefit of taking both outweigh the risk in my case?
  • Do I need any blood test, ECG or other check while on both?
  • What early warning signs should I watch for, and what should I do if they appear?

Bring a full list of your medicines, including over-the-counter products, supplements and herbal remedies, to every pharmacy visit.

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Domande frequenti

Can I take Vitamin k1 with Warfarin?

MediHelp rates the interaction as major. Vitamin k1 and Warfarin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Vitamin K1 directly antagonizes warfarin and reduces INR, leading to loss of anticoagulation. This is used therapeutically for reversal but can cause unintended resistance with supplements.

How serious is the interaction between Vitamin k1 and Warfarin?

MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Keep vitamin K intake consistent and monitor INR whenever dosing changes; when used for reversal, titrate dose to INR and bleeding status.

What other medicines interact with Warfarin?

MediHelp also lists interactions of Warfarin with, for example, Defibrotide, Ketorolac, Abciximab. The full list is on the Warfarin page.

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