Can celecoxib affect P-glycoprotein-mediated drug efflux? A microPET study

This study shows that celecoxib is not a substrate of Pgp and does not substantially affect the Pgp-mediated efflux of [11C]verapamil. Therefore, celecoxib-induced augmentation of the efficacy of chemotherapeutic and neurotropic drugs must be due to another mechanism than modulation of Pgp-mediated drug efflux.