Used in the treatment of HIV and chronic hepatitis B, this compound is an antiviral agent that delivers tenofovir more efficiently into cells. It achieves high concentrations in target lymphoid cells while minimizing exposure in plasma, reducing the risk of kidney and bone toxicity compared to older formulations. It is a key component in single-tablet regimens for HIV, improving patient adherence. Due to its potency and safety profile, it is widely used in both treatment-naive and experienced patients, including adults and certain pediatric populations.