Explanation
• 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