What is the reversal drug for heparin?

Protamine sulfate is recognized as the specific reversal agent for heparin. When heparin, which is an anticoagulant, is administered, it increases the risk of bleeding by inhibiting the clotting process. In cases where there is a need to reverse the effects of heparin—such as during emergency surgery or in instances of significant bleeding—protamine sulfate is used because it directly binds to heparin and neutralizes its effects. This interaction allows for the restoration of normal coagulation activity, effectively counteracting the anticoagulant properties of heparin.

The other drugs listed serve different purposes; for example, phytonadione (Vitamin K) is primarily used to reverse the effects of warfarin, a different type of anticoagulant. Idarucizumab is a reversal agent for dabigatran, specifically designed for direct oral anticoagulants. Aminocaproic acid is an antifibrinolytic agent used to reduce bleeding by inhibiting the breakdown of fibrin, but it does not reverse anticoagulation caused by heparin. Thus, protamine sulfate stands out as the correct and specific antidote for heparin therapy.