The concomitant use of transdermal fentanyl with ritonavir or other potent 3A4 inhibitors such as ketoconazole, itraconazole, troleandomycin, clarithromycin, nelfinavir, and nefazadone may result in an increase in fentanyl plasma concentrations.
<fentanyl, mechanism, ritonavir>, <fentanyl, mechanism, ketoconazole>, <fentanyl, mechanism, itraconazole>, <fentanyl, mechanism, troleandomycin>, <fentanyl, mechanism, clarithromycin>, <fentanyl, mechanism, nelfinavir>