Used primarily in the treatment of chronic hepatitis B virus (HBV) infection. It works by inhibiting the viral DNA polymerase enzyme, thereby reducing viral replication. This helps lower the amount of virus in the body, which can lead to improved liver function and reduced risk of liver damage, including cirrhosis and liver cancer. The compound is an oral prodrug that is metabolized in the body to its active form, adefovir, allowing for better absorption and delivery. It is typically prescribed for patients who have not responded to or cannot tolerate other antiviral therapies.