Used in the treatment of HIV infection as part of antiretroviral therapy. It works by inhibiting the reverse transcriptase enzyme, preventing the virus from replicating in human cells. Often combined with other antiretroviral drugs to reduce viral load, increase CD4 cell count, and slow disease progression. Not a cure for HIV, but helps manage the condition and reduce transmission risk. Requires genetic screening before use to avoid severe hypersensitivity reactions in certain patients.