Final answer:
Protamine sulfate is the antidote for Heparin, which is used to reverse the anticoagulant effects of Heparin in cases such as excessive bleeding.
Step-by-step explanation:
The antidote for Heparin is Protamine sulfate. Heparin is an anticoagulant substance used to prevent the formation of blood clots. As an antidote, Protamine sulfate acts by binding to Heparin, which leads to the formation of a stable complex that neutralizes the anticoagulant effects of Heparin. This is critical in situations where it's necessary to reverse the effects of Heparin, such as in cases of excessive bleeding or when a patient is about to undergo surgery.