Title : Methadone--metabolism, pharmacokinetics and interactions.

Pub. Date : 2004 Dec

PMID : 15501692






3 Functional Relationships(s)
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1 Methadone is mostly metabolised in the liver; the main step consists in the N-demethylation by CYP3A4 to EDDP (2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine), an inactive metabolite. Methadone cytochrome P450 family 3 subfamily A member 4 Homo sapiens
2 The activity of CYP3A4 varies considerably among individuals, and such variability is the responsible for the large differences in methadone bioavailability. Methadone cytochrome P450 family 3 subfamily A member 4 Homo sapiens
3 In particular, antiretrovirals, which are CYP3A4 inducers, can decrease the levels of methadone, so causing withdrawal symptoms. Methadone cytochrome P450 family 3 subfamily A member 4 Homo sapiens