Hepatitis exacerbation. Lactic acidosis & severe hepatomegaly w/ steatosis. Frequently monitor virological response in lamivudine-refractory patients & perform appropriate resistance testing. Evaluate renal function before & during treatment in liver transplant recipients receiving cyclosporine or tacrolimus. Not to be used for HIV/HBV co-infected patients who are not receiving highly active antiretroviral therapy (HAART). Patients w/ rare hereditary problems of galactose intolerance, the Lapp lactase deficiency or glucose-galactose malabsorption. Patients w/ renal impairment.