How Long Does Trazodone Stay in Urine?
Evidence-based answer reviewed against SAMHSA cutoffs and FDA assay documentation · Updated August 2026
Quick answer: Most people clear Trazodone from urine within screen interference window ~2–4 days post-dose of last use — heavy or daily use stretches that window substantially. Not directly screened; cross-reacts on some amphetamine immunoassays.
Trazodone detection windows by test type
Each specimen tells a different story because each samples different biology:
| Test type | Typical Trazodone detection window |
|---|---|
| Urine | any: screen interference window ~2–4 days post-dose |
| Saliva (Mouth Swab) | any: n/a (indirect) |
| Hair Follicles | n/a |
| Blood | any: n/a |
('Urine remains the employment default because it balances cost, window-length and legal defensibility. Metabolite CONCENTRATIONS (not presence/absence) decide results against cutoff tables, which is why hydration status moves numbers and why validity checks (creatinine, specific gravity) police dilution attempts.',)
Why detection works this way
Trazodone doesn't get tested FOR — it can cause amphetamine-strip screen positives in documented case reports. Confirmation testing (GC–MS) shows no amphetamine and closes the loop.
If you take trazodone nightly and receive an unexpected amphetamine screen flag, invoke the MRO review immediately and list trazodone.
Factors that stretch or shrink your window
- Frequency & dose — chronic use saturates stores; single use clears fastest.
- Body composition — some metabolites persist longer with higher body-fat percentages.
- Metabolism & hydration — concentration shifts with fluid intake; elimination speed does not.
- Potency & route — concentrates and edibles deliver more analyte than light use.
Testing cutoffs in plain language
Not directly screened; cross-reacts on some amphetamine immunoassays. A specimen under the initial cutoff reports negative without further work; a screen above cutoff gets confirmed by mass spectrometry before anyone sees a positive.
Planning ahead? Our at-home drug test guide covers retail kits that mirror lab screens.
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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)