Clinical studies of epilepsy using Epidiolex® have demonstrated potential inhibition or induction of CYP2C19, CYP3A4, CYP2C8, CYP2C9, CYP1A2, CYP2B6, UGT1A9, and UGT2B7 (Samanta 2019), (Epidiolex: prescribing informtion. This evidence concerns the gene UGT1A9 and epilepsy.