DUOVIR 150 MG / 300 MG (lamivudine / zidovudine) is a medicine A combination of two antiretroviral drugs that help treat HIV infection. This medicine helps reduce the amount of HIV in the body, allowing the immune system to work better. This also helps reduce the risk of HIV transmission. DUOVIR is available online in the United States and is a simple and convenient way to administer HIV treatment.