The recommended dose of entecavir for chronic hepatitis B virus infection in nucleoside-treatment-naive adults and adolescents 16 years of age and older: 0.5 mg once daily.
The recommended dose of entecavir in adults and adolescents (≥16 years of age) with a history of hepatitis B viremia while receiving lamivudine or known lamivudine resistance mutations: 1 mg once daily.
Patients with renal impairment: See table.

Hepatic impairment: No dosage adjustment is necessary for patients with hepatic impairment.