Cannabidiol is a potent inhibitor of the catalytic activity of cytochrome P450 2C19.

@article{Jiang2013CannabidiolIA,
  title={Cannabidiol is a potent inhibitor of the catalytic activity of cytochrome P450 2C19.},
  author={Rongrong Jiang and Satoshi Yamaori and Yasuka Okamoto and Ikuo Yamamoto and Kazuhito Watanabe},
  journal={Drug metabolism and pharmacokinetics},
  year={2013},
  volume={28 4},
  pages={
          332-8
        }
}
The present study investigated the inhibitory effect of cannabidiol (CBD), a major constituent of marijuana, on the catalytic activity of cytochrome P450 2C19 (CYP2C19). (S)-Mephenytoin 4'-hydroxylase activities of human liver microsomes (HLMs) and recombinant CYP2C19 were inhibited by CBD in a concentration-dependent manner (IC₅₀ = 8.70 and 2.51 µM, respectively). Omeprazole 5-hydroxylase and 3-O-methylfluorescein O-demethylase activities in recombinant CYP2C19 were also strongly inhibited by… 

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