The EDDP (Methadone Metabolite) Rapid Test is a rapid immunochromatographic assay for the qualitative detection of 2-ethylidene-1,5-dimethyl-3,3 diphenylpyrrolidine (EDDP), an inactive metabolite of methadone that acts as a narcotic pain reliever and is used as a treatment for opiate addiction.
Methadone is an unusual drug in that its primary urinary metabolites (EDDP and EMDP) are cyclic in structure, making them very difficult to detect using immunoassays targeted to the native compound.1 Exacerbating this problem, there is a subsection of the population classified as "extensive metabolizers" of methadone. In these individuals, a urine specimen may not contain enough parent methadone to yield a positive drug screen even if the individual is in compliance with their methadone maintenance. EDDP represents a better urine marker for methadone maintenance than unmetabolized methadone.
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