The concomitant use of TYLENOL® with Codeine with all CYP3A4 inducers or discontinuation of a CYP3A4 inhibitor might cause lessen codeine stages, greater norcodeine stages, and less metabolism through CYP2D6 with resultant lessen morphine stages. From Mayo Clinic to your inbox Sign up for absolutely free and stay current on https://wockusa.com/product/blue-xanax-bar/