Because lamivudine is in the same category of HIV therapies as another widely used drug, emtricitabine, its effectiveness is also compromised by entecavir, she says.

Remember also, the drugs tenofovir and lamivudine both appear in breast milk but in very low levels and probably have little effect.

Hepatology Digest: Unfortunately in China, entecavir is very expensive and tenofovir is not yet licensed so we still use a lot of lamivudine and adefovir.