Used in the treatment of HIV and chronic hepatitis B, this compound is an antiviral medication that works by inhibiting the replication of the virus. It is a prodrug of tenofovir, designed to deliver the active ingredient more efficiently into cells, allowing for lower doses and reduced risk of kidney and bone side effects compared to earlier treatments. It is commonly found in combination therapies and taken orally in tablet form. Due to its high potency and improved safety profile, it has become a preferred option in long-term antiviral regimens.