Hepsera, with the active ingredient adefovir dipivoxil, is a prescription medication used in the treatment of chronic hepatitis B, a viral infection that affects the liver. It belongs to a class of drugs known as nucleotide analog reverse transcriptase inhibitors (NtRTIs), which work by interfering with the virus's ability to replicate and spread within the body. Hepsera is administered in tablet form and is designed for long-term treatment to help manage the symptoms of hepatitis B, reduce the amount of virus in the body, and improve liver function. However, it is not a cure for hepatitis B and may not prevent complications such as cirrhosis or liver cancer. Patients are advised to follow their healthcare provider's instructions closely when taking Hepsera and to discuss any potential side effects or concerns.