Summary of Data

In Vitro

  • Biorelevant intestinal solubility of THC and CBD ranged from approximately 28-40 µM.
  • Both THC and CBD were highly bound to plastic and microsomal proteins (>90%); highlighting the importance of including binding limitations in assessment of in vitro cannabinoid inhibition potency towards CYPs.

In Vitro to In Vivo Extrapolation

  • Binding corrected CBD in vitro inhibition potency towards CYP2C9, CYP2C19, CYP2D6, and CYP3A4 indicated a strong potential for CBD-mediated intestinal and pre-systemic hepatic interactions involving substrates of all four CYP isoforms.
  • Binding corrected THC in vitro inhibition potency towards CYP2C9, CYP2C19, CYP2D6, and CYP3A4 indicated a strong potential for THC-mediated intestinal interactions with CYP3A4 substrates and CYP2C9 mediated presystemic hepatic interactions
  • Evaluation of in vitro THC metabolite (11-OH-THC and COOH-THC) mediated interactions suggest limited potential for CYP mediated interactions.

Clinical

Definitive assessment of clinical cannabinoid-drug interaction potential is pending evaluation by the NaPDI Pharmacology Core.

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