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Clin Toxicol 2022;60:472-7
After stopping a CYP3A4 inhibitor, as the effects of the inhibitor decline, it may result in lower codeine levels, greater norcodeine levels, and less metabolism via CYP2D6 with resultant lower morphine levels [see CLINICAL PHARMACOLOGY], resulting in decreased opioid efficacy or a withdrawal syndrome in patients who had developed physical dependence to codeine
Lancet (2021) 397(10273):4557
Mittal VV, Sharma BC, Sharma P, Sarin SK