Used in the treatment of HIV infection, Amprenavir is an antiretroviral medication that belongs to the protease inhibitor class. It works by blocking the activity of the HIV protease enzyme, preventing the virus from maturing and producing infectious particles. Amprenavir helps reduce the amount of HIV in the body, thereby improving immune function and decreasing the risk of HIV-related complications. It is typically used in combination with other antiretroviral drugs to enhance effectiveness and reduce the likelihood of drug resistance.