CYP2C9 Inducers

    CYP2C9 inducers include, but are not limited to, aprepitant, bosentan, carbamazepine, enzalutamide, nelfinavir, phenobarbital, phenytoin, rifampin, ritonavir, and St. John’s wort. See glossary page for more information.

    Summary

    CYP2C9 inducers are compounds that increase the activity of the CYP2C9 enzyme, which can increase drug metabolism, potentially impacting the effects of drug therapy.

    CYP2C9 is a cytochrome P450 (CYP) enzyme found primarily in the liver and minorly in the intestines. It is involved in the metabolism of any medications that are CYP2C9 substrates, which includes many widely used medications.[1] CYP2C9 inducers can increase the body’s metabolism of these medications.

    The table below outlines some of the most common or clinically relevant CYP2C9 inducers.[1][2][3] Importantly, this list is not exhaustive.

    CYP2C9 Inducers
    Aprepitant
    Bosentan
    Carbamazepine
    Enzalutamide
    Nelfinavir
    Phenobarbital
    Phenytoin
    Rifampin
    Ritonavir
    St. John’s wort

    References

    1. ^Song Y, Li C, Liu G, Liu R, Chen Y, Li W, Cao Z, Zhao B, Lu C, Liu YDrug-Metabolizing Cytochrome P450 Enzymes Have Multifarious Influences on Treatment Outcomes.Clin Pharmacokinet.(2021-May)
    2. ^Zanger UM, Schwab MCytochrome P450 enzymes in drug metabolism: regulation of gene expression, enzyme activities, and impact of genetic variation.Pharmacol Ther.(2013-Apr)
    3. ^Hakkola J, Hukkanen J, Turpeinen M, Pelkonen OInhibition and induction of CYP enzymes in humans: an update.Arch Toxicol.(2020-Nov)