Ritonavir kan vid samtidig administrering modifiera P- glykoproteinmedierad fexofenadin efflux vilket resulterar i ökade koncentrationer av fexofenadin. ###>Interaction with indinavir/ ritonavir not studied Ritonavir may modify P-glycoprotein mediated fexofenadine efflux when coadministered resulting in increased concentrations of fexofenadine.