Aprotinin is widely used in medical and surgical settings for its ability to inhibit proteolytic enzymes. It is commonly administered during cardiac surgeries to reduce blood loss and the need for blood transfusions by preventing the breakdown of fibrin, a key component in blood clot formation. Additionally, it is utilized in the treatment of acute pancreatitis to inhibit trypsin and other proteases that contribute to tissue damage. In research, aprotinin serves as a protease inhibitor in laboratory experiments to stabilize protein samples and prevent their degradation. Its applications also extend to organ transplantation, where it helps minimize ischemic injury and improve graft survival.