Ritonavir kan modificere P - glycoproteinmedieret fexofenadinefflux, når det ved samtidig administration medfører øget koncentration af fexofenadin.
Interaction with indinavir/ ritonavir not studied Ritonavir may modify P-glycoprotein mediated fexofenadine efflux when coadministered resulting in increased concentrations of fexofenadine.