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Warfarin cranberry — GPhC CRA MCQ

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HardDrug InteractionsWarfarin cranberryGPhC CRA

A patient taking warfarin wants to drink large amounts of cranberry juice daily for urinary symptoms. What is the most appropriate action?

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

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Correct answer: B — Large cranberry intake may affect anticoagulation control and should be discussed with the anticoagulation clinic

Cranberry products have been reported to affect INR control in patients taking warfarin. In this scenario, the pharmacist should prioritise safe supply, appropriate counselling and timely referral or clarification where needed. This is the single best answer because the other options would either delay assessment, ignore a clinically significant risk, or create an unsafe legal or professional outcome.

Reference: BNF; MEP