Tenvir EM is combination of two antiretroviral drugs namely emtricitabine and tenofovir disoproxil fumarate, which are only effective against RNA viruses such as Human Immunodeficiency Virus (HIV). Tenvir-em must be taken with at least one other anti-HIV medication in order to be effective. This will help prevent the HIV virus from progressing to AIDS. Visit this site for more information on tenvir-em.