if you have financial issues check posts on this forum about generics, you can switch to tenvir which is tdf or tenvir em or similar name which is tdf+ftc, both are more potent than entecavir, entecavir
generic is not available but since the other drugs are more potent there is no need for it
see posts on this forum about where you can buy them and if you can afford them, they are produced by cipla at an affordable price, please be very careful not to stop entecavir if you don't have other