A patient prescribed warfarin for atrial fibrillation asks about adding herbal supplements to their daily routine. Which product identified by the nurse requires immediate intervention due to a high risk of drug-drug interaction?

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Garlic extract. The correct answer is garlic extract. Several herbal supplements, notably the "4 Gs" (Garlic, Ginkgo, Ginger, Ginseng), possess antiplatelet properties that can significantly potentiate the anticoagulant effect of warfarin, increasing the risk of spontaneous bleeding. While other supplements like Vitamin C, zinc, or probiotics (distractors) may have minor interactions or lack evidence of harm, garlic extract presents a well-documented safety hazard that necessitates counseling to prevent adverse hemorrhagic events.

A patient prescribed warfarin for atrial fibrillation asks about adding herbal supplements to their daily routine. Which product identified by the nurse requires immediate intervention due to a high risk of drug-drug interaction?

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