Used primarily as an antiretroviral medication, it plays a crucial role in the treatment of HIV infection. It functions as a protease inhibitor, effectively blocking the enzyme that the virus needs to replicate. This helps in reducing the viral load in patients, improving their immune system function, and slowing the progression of the disease. It is often prescribed in combination with other antiretroviral drugs to enhance its efficacy and reduce the risk of developing drug resistance. Its application is critical in managing chronic HIV infections and improving the quality of life for affected individuals.