Medications most often used to treat chronic hepatitis C include: Peginterferon and other interferons, which are similar to a protein produced by your body that boosts its natural defenses. Combination antiviral therapy with interferons and ribavirin, which help prevent the virus from reproducing in the body. Ribavirin may be used in people older than age 3 to treat hepatitis C. The most effective treatment for HIV is highly active antiretroviral therapy (HAART)—a combination of several antiretroviral drugs that aims to control the amount of virus in your body. Other steps you can take include keeping your immune system strong, taking drugs as prescribed, and monitoring your CD4+ (white blood cells) counts to slow the multiplication of the virus in your body. HAART drugs that are most often used to treat HIV infection include: Nucleoside reverse transcriptase inhibitors (NRTIs), also called nucleoside analogs, such as zidovudine (ZDV, formerly AZT) and stavudine (d4T). These drugs are often combined with other drugs for best results. Nonnucleoside reverse transcriptase inhibitors (NNRTIs), such as efavirenz, nevirapine, or delavirdine. Nucleotide reverse transcriptase inhibitors, such as tenofovir. Protease inhibitors (PIs), such as atazanavir, saquinavir, ritonavir, indinavir, nelfinavir, fosamprenavir, or lopinavir/ritonavir. Fusion inhibitors, such as enfuvirtide. This is a new class of drugs for treating HIV. Other drugs that may be used to treat HIV or AIDS-related conditions include cytokines, such as interferon alfa-2a and interferon alfa-2b.