Detection windows · opioid
Methadone detection windows
Methadone is a long-acting synthetic opioid used for chronic pain and as opioid-use-disorder treatment. It is not detected by standard "opiates" immunoassays and requires its own assay or appears on 10-panel screens.
Last updated:How long is Methadone detectable?
Detection windows for Methadone vary by specimen, use pattern, and individual factors. As approximate ranges: urine commonly covers a few days (longer in chronic users), oral fluid covers hours to about 48 hours, blood covers hours, and hair offers up to ~90 days after a ~7–10 day incorporation delay. Full matrix below — and see the interactive Explorer for cross-substance comparisons.
| Specimen | Window | Pattern | Caveat |
|---|---|---|---|
| Urine | 3–14 days | typical | EDDP metabolite extends detection; long half-life of parent compound. |
| Saliva | 1–3 days | typical | Oral fluid detection moderate. |
Ranges are approximate and vary by individual physiology, hydration, dose, frequency of use, and lab cutoff. They are not predictive of whether someone will "pass" a test.
About Methadone
A long-acting μ-opioid receptor agonist with a uniquely long half-life. Workplace and clinical panels include it when monitoring for prescribed use or in clinics treating opioid use disorder.
Key analytes / metabolites detected
- EDDP (2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine)
Common cross-reactants (immunoassay-stage)
The following can affect screening immunoassay results and are typically resolved by mass-spectrometry confirmation and MRO review:
- Verapamil (rare, historical)
- Tapentadol (low)
Appears in panels
Confirmation method
LC-MS/MS or HPLC is the standard confirmation method for Methadone.
Sources & references
drugtest.co content is sourced from primary regulatory and clinical references. We do not cite gray-market or "how to pass" sources.