Quick answer
Methadone is typically detectable in urine for 2–4 days after single use; up to 2 weeks+ (EDDP persists) after maintenance. It is screened on standard 10-panel, 12-panel drug tests.
Screened on: 10-panel 12-panel
Typical cutoff: Expanded urine: 300 ng/mL initial; EDDP (metabolite) confirm ~250 ng/mL.
Detection window by test type
| urine | |
|---|---|
| Single use | 2–4 days |
| maintenance | up to 2 weeks+ (EDDP persists) |
| saliva | |
| Any use | 1–3 days |
| hair | |
| Any use | up to 90 days |
| blood | |
| Any use | ~2–3 days |
Ranges reflect typical published detection windows and vary with dose, frequency, body composition, hydration and the assay used.
Key details
Methadone maintenance patients show steady-state levels constantly — clinic programs EXPECT positivity and monitor take-home compliance via EDDP ratios.
Employment 10/12-panel cups include MTD; a documented opioid-treatment-program prescription verifies through the MRO and is protected in many jurisdictions.
Its long, variable half-life (8–59 hours) makes personal prediction unreliable; clinic supervision governs dosing.
False positives & cross-reactivity
- Diphenhydramine (Benadryl), doxylamine, verapamil, clomipramine, and quetiapine (Seroquel) have documented methadone-screen false positives.
Frequently asked questions
How long does methadone stay in your system?
In urine, typical detection is 2–4 days (single use); up to 2 weeks+ (EDDP persists) (maintenance). Hair can detect use for up to 90 days and saliva/blood windows are usually shorter.
Will methadone show up on a standard drug test?
Yes — Methadone is screened on standard panels (10-panel, 12-panel).
Can anything cause a false positive for methadone?
Diphenhydramine (Benadryl), doxylamine, verapamil, clomipramine, and quetiapine (Seroquel) have documented methadone-screen false positives.
How accurate are these detection windows?
They are typical ranges from published literature and assay documentation, not guarantees. Clearance depends on dose, frequency, metabolism and the specific test cutoff used.
Related substances
Cite this page
DrugPanels. “Methadone Detection Time.” https://drugpanels.com/detection/methadone/. Accessed 2026-09-10.
Sources
- Brahm NC et al., Commonly prescribed medications and potential false-positive drug test results, Mayo Clinic Proceedings 2008 — Mayo Clinic Proceedings — pubmed.ncbi.nlm.nih.gov
- SAMHSA drug testing resources and analyte specifications — Substance Abuse and Mental Health Services Administration — samhsa.gov
Detection windows describe typical ranges from the published literature and assay documentation; individual results vary. See our methodology.