I et fase 1b- studie var der ingen signifikant virkning af gemcitabin på erlotinibs farmakokinetik og heller ingen signifikant virkning af erlotinib på gemcitabins farmakokinetik.
In a Phase Ib study, there were no significant effects of gemcitabine on the pharmacokinetics of erlotinib nor were there significant effects of erlotinib on the pharmacokinetics of gemcitabine.