<prompt> All are nucleosides used in the treatment of chronic HBV, EXCEPT:LamivudineTelbivudineEmtricitabineRibavirin  <response>: Seven drugs are available for the treatment of chronic hepatitis B: Conventional interferon alpha, Pegylated interferon alpha L-nucleosides lamivudine, telbivudine, and emtricitabine, Deoxyguanosine Analogs entecavir and Acyclic nucleoside phosphonates adefovir and tenofovir. Ribavirin is used to treat chronic HCV Ref: Journal of Hepatology 50 2009 227-242. 