The Use of the Methadone/Metabolite Ratio (MMR) to Identify an Individual Metabolic Phenotype and Assess Risks of Poor Response and Adverse Effects: Towards Scientific Methadone Dosing.

Abstract excerpt

OBJECTIVES: Significant genetic variability of metabolism confounds reliable clinical use of methadone because physicians have no way of identifying individual patient metabolism. The methadone/metabolite ratio (MMR), the numerical ratio of serum methadone to its inactive metabolite ethylidine-dimethyl-diphenypyrrolidine (EDDP), represents the net expression of the genes controlling metabolism. The MMR has been...

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