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Warfarin vitamin K counselling — GPhC CRA MCQ

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ModeratePatient CounsellingWarfarin vitamin K counsellingGPhC CRA

A patient taking warfarin asks to buy a new multivitamin containing vitamin K. His INR has been stable for 6 months and he eats a consistent diet. What would you advise the patient?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: E — Discuss with the anticoagulation clinic before starting because vitamin K intake changes can alter INR

Warfarin response is affected by changes in vitamin K intake. Patients do not need to avoid vitamin K foods, but sudden changes from supplements can alter INR and should be discussed with the anticoagulation service. Adjusting warfarin independently is unsafe. INR monitoring remains necessary.

Reference: BNF; NICE CKS Anticoagulation