Used primarily in the treatment and prevention of HIV infection as part of antiretroviral therapy. It is also effective in managing chronic hepatitis B virus (HBV) infection. The compound works by inhibiting viral reverse transcriptase, an enzyme essential for viral replication, thereby reducing viral load in the body. Due to its high potency and favorable safety profile, it is widely used in combination therapies and pre-exposure prophylaxis (PrEP) to prevent HIV transmission in high-risk individuals.