A nurse is caring for a client who is on warfarin therapy for atrial fibrillation. The client's INR is 5.2. Which of the following medications should the nurse prepare to administer?

A. Atropine is used to treat bradycardia, not elevated INR levels. It does not affect the coagulation process. B. An INR of 5.2 is elevated, indicating an increased risk of bleeding. Vitamin K is the antidote for warfarin toxicity, helping to reverse the anticoagulant effect and restore normal clotting. C. Epinephrine is used in cases of severe allergic reactions or cardiac arrest but is not used to reverse the effects of warfarin or to manage elevated INR levels. D. Protamine is used to reverse the effects of heparin, not warfarin. Since the client is on warfarin, vitamin K is the appropriate treatment.