Antiretroviral

adj. of or pertaining to a substance that suppresses or inhibits the activity of a retrovirus (such as HIV)

n. substance that suppresses or inhibits the activity of a retrovirus (such as HIV)

Antiretroviral drugs are medications for the treatment of infection by retroviruses, primarily HIV. Different classes of antiretroviral drugs act at different stages of the HIV life cycle. Combination of several (typically three or four) antiretroviral drugs is known as Highly Active Anti-Retroviral Therapy (HAART).
See more at Wikipedia.org...

Treatment with drugs that inhibit the ability of the human immunodeficiency virus (HIV) or other types of retroviruses to multiply in the body.