In- vitro undersøgelser viser at ertapenem havde en lille effekt på plasmaproteinbinding hos meget proteinbundne lægemidler (warfarin, ethinyl estradiol og norethindron).
In-vitro studies indicate that the effect of ertapenem on the plasma protein binding of highly protein bound medicinal products (warfarin, ethinyl estradiol, and norethindrone) was small.