A nurse is caring for a client who has thrombophlebitis and is receiving a continuous heparin infusion. Which of the following medications should the nurse have available to reverse heparin's effects?

A. Vitamin K is used to reverse the effects of warfarin, not heparin. Heparin's effects can be reversed with protamine sulfate, which is an antidote specifically for heparin. B. Acetylcysteine is used to treat acetaminophen overdose and is not effective for reversing the effects of heparin. C. Deferasirox is used to treat iron overload, not to reverse heparin’s anticoagulant effects. D. Protamine sulfate is the antidote to heparin and can rapidly neutralize its anticoagulant effect. It should be administered if a client on heparin requires reversal due to bleeding or surgery.