Entecavir is an antiviral medicine that is used to treat chronic hepatitis B virus (HBV) in adults and children who are at least 2 years old and weigh at least 22 pounds (10 kilograms).
Entecavir is not a cure for hepatitis. It is not known whether  entecavir will prevent cirrhosis or liver cancer.
Entecavir may also be used for purposes not listed in this medication guide.
