What Will Methadone Test Positive for?

Evidence-based answer reviewed against SAMHSA cutoffs and FDA assay documentation · Updated August 2026

Quick answer: No — not on any standard panel. Methadone is absent from routine 5-, 10-, and 12-panel employment drug tests. Expanded urine: 300 ng/mL initial; EDDP (metabolite) confirm ~250 ng/mL.

Which panels screen for it

PanelMethadone status
5-Panel❌ Not included
10-Panel✅ Included
12-Panel✅ Included
DOT 5-panel (safety-sensitive)❌ Not included

The details that matter

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.

If it IS detected, how long does it last?

Ranges reflect occasional-to-heavy use patterns from FDA device inserts and SAMHSA-certified lab conventions.
Test typeTypical Methadone detection window
Urinesingle: 2–4 days; maintenance: up to 2 weeks+ (EDDP persists)
Saliva (Mouth Swab)any: 1–3 days
Hair Folliclesup to 90 days
Bloodany: ~2–3 days

False-positive notes

  • Diphenhydramine (diphenhydramine), doxylamine, verapamil, clomipramine, and quetiapine (quetiapine) have documented methadone-screen false positives.

Remember: immunoassay screens produce artifacts; mass-spec confirmation and the MRO review are where legitimate explanations win.

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Medical disclaimer: DrugPanels provides educational information about laboratory drug testing and does not offer medical advice, diagnosis, or treatment. Detection windows are population ranges — individual results vary with metabolism, dose, frequency and health status. Never stop prescribed medication to pass a test without talking to your prescriber. Affiliate disclosure: some links on this page are affiliate links; if you order through them we may earn a commission at no additional cost to you.

People also ask

Does Methadone Show up on a Drug Test?

No — Methadone is absent from standard drug panels. Full guide →

How Long Does Methadone Show up in a Drug Test?

How long Methadone stays detectable in your system (all test types) — urine, hair, saliva & blood windows explained with cutoffs. Full guide →

How to Pass a Drug Test for Methadone?

Evidence-based ways to pass a drug test for Methadone — realistic timelines, what works, what backfires, and dilution flags to avoid. Full guide →

How Long Does Methadone Stay in Saliva Drug Test?

How long Methadone stays detectable in saliva (mouth swab) — urine, hair, saliva & blood windows explained with cutoffs. Full guide →

Do prescriptions count against me?

No — verified prescriptions report as negative through the Medical Review Officer. Declare medications at collection and answer the follow-up call.

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Sources & further reading

  • SAMHSA — Mandatory Guidelines for Federal Workplace Drug Testing Programs (cutoffs, MRO process)
  • DOT — 49 CFR Part 40 procedures for transportation workplace testing
  • Brahm NC et al., Mayo Clinic Proceedings 2008;83(1):66–76 — false-positive cross-reactivity reference
  • FDA — drug-of-abuse test device labeling (detection window conventions)