HIV
These drugs slow the progression of the HIV virus in the body. Usually, these treatments consist of a combination of three or more drugs, and each drug performs a different job in fighting the virus. In general, HAART prevents the HIV from multiplying and destroying CD4 cells. CD4 cells are necessary to help protect the body from infections and cancer. Since the HIV virus destroys CD4 cells, it causes people with HIV to be more prone to illness.