text: ThioTEPA (CYP2B6 inhibitor, 25 μM) and the monoclonal antibody against CYP2B6 but not << troleandomycin >> ([[ CYP3A4 ]] inhibitor, 25 μM) or the monoclonal antibody against CYP3A4 inhibited ketamine N-demethylation at clinically relevant concentrations.