Aprotinin is widely used in medical and research applications due to its ability to inhibit proteolytic enzymes. In surgery, it is employed to reduce blood loss and the need for transfusions, particularly in cardiac and orthopedic procedures. It works by inhibiting enzymes like plasmin and kallikrein, which are involved in fibrinolysis and inflammatory responses.

In laboratory settings, aprotinin is utilized as a protease inhibitor to prevent protein degradation during cell lysis and protein extraction processes. This makes it valuable in biochemistry and molecular biology research. Additionally, it is used in cell culture to maintain the integrity of proteins and peptides.

Its anti-inflammatory properties also make it a candidate for studying conditions involving excessive proteolytic activity, such as pancreatitis and certain inflammatory diseases. Overall, aprotinin plays a critical role in both clinical and experimental contexts.