A patient diagnosed with atrial fibrillation is prescribed warfarin. Which of the following can interact with the effects of warfarin?


• Dark leafy green vegetables are high in vitamin K and will reduce the effects of warfarin. However, the patient should maintain a consistent intake of vitamin K to prevent increased or decreased effects of warfarin due to changes in diet (vitamin K intake). 

• Ferrous sulfate (iron) does not interact with warfarin. 

• Furosemide does not interact with warfarin. 

• Carrots are high in vitamin A, which does not have an effect on warfarin. 

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