Tenofovir 300mg combined with Emtricitabine 200mg is a fixed-dose antiviral medication used primarily for the treatment and prevention of HIV-1 infection. This combination works by inhibiting the reverse transcriptase enzyme essential for HIV replication, reducing the viral load and helping restore immune function by increasing CD4+ cell counts. It is commonly used alongside other antiretroviral agents for managing HIV infection and is also approved for pre-exposure prophylaxis (PrEP) to lower the risk of HIV infection in high-risk individuals. The medication is taken orally, usually once daily, under medical supervision.