Implications of mechanism-based inhibition of CYP2D6 for the pharmacokinetics and toxicity of MDMA
Journal of Psychopharmacology – May 20, 2006
Source: OpenAlex
Summary
A typical recreational dose of MDMA can inactivate over 90% of hepatic CYP2D6 within one hour, with recovery taking at least 10 days. This finding challenges previous assumptions about the genetic polymorphism of CYP2D6 and its role in MDMA pharmacokinetics and acute toxicity risk. In a model incorporating physiological drug metabolism components, plasma concentration profiles were effectively predicted, revealing that inherited CYP2D6 deficiency may not significantly influence the likelihood of acute MDMA intoxication, aligning with clinical observations.
Abstract
The aim of this study was to model the in vivo kinetic consequences of mechanism-based inhibition (MBI) of CYP2D6 by 3,4 methylenedioxymethamphetamine (MDMA, ecstasy). A model with physiologically-based components of drug metabolism was developed, taking account of change in the hepatic content of active CYP2D6 due to MBI by MDMA. Based on the in vitro information, plasma concentration time profiles of MDMA after various doses were computed and compared with reported observations. The analysis suggested that a typical recreational MDMA dose could inactivate most hepatic CYP2D6 within an hour, and the return to a basal level of CYP2D6 could take at least 10 days. Thus, the genetic polymorphism of CYP2D6 and coadministration of CYP2D6 inhibitors may have less impact on MDMA pharmacokinetics and the risk of acute toxicity than previously thought. This is consistent with clinical observations that indicate no obvious link between inherited CYP2D6 deficiency and acute MDMA intoxication.