I HBV- kombinationsassays i cellekulturer var abacavir, didanosin, lamivudin, stavudin, tenofovir og zidovudin ikke antagonistiske over for entecavirs anti- HBV- aktivitet inden for et større koncentrationsspænd.
In HBV combination assays in cell culture, abacavir, didanosine, lamivudine, stavudine, tenofovir or zidovudine were not antagonistic to the anti-HBV activity of entecavir over a wide range of concentrations.