5 Dangerous Food-Drug Interactions

SEPTEMBER 16, 2015
Allison Gilchrist, Associate Editor
3. Vitamin K-Rich Foods + Warfarin
Pharmacists should counsel patients taking warfarin to maintain a consistent intake of vitamin K and avoid introducing kale, spinach, and other leafy greens to their diets.
Vitamin K is vital for the production of clotting factors that help prevent bleeding, but anticoagulants like warfarin exert their effect by inhibiting vitamin K. Therefore, an increased intake of the nutrient can antagonize the anticoagulant effect and prevent the drug from working.