I antivirale HIV- assays var entecavir i mikromolære koncentrationer ikke antagonistisk over for anti- HIV- aktivitet i cellekulturer af disse 6 NRTI' er eller emtricitabin.
In HIV antiviral assays, entecavir at micromolar concentrations was not antagonistic to the anti-HIV activity in cell culture of these six NRTIs or emtricitabine.