How Long Does Amphetamines Stay in Urine?
Evidence-based answer reviewed against SAMHSA cutoffs and FDA assay documentation · Updated August 2026
Quick answer: Most people clear Amphetamines from urine within 1–3 days of last use — heavy or daily use stretches that window substantially. Urine: 500 ng/mL initial screen; GC–MS confirm at 250 ng/mL requiring d-amphetamine (methamphetamine confirm additionally requires methamphetamine ≥250 ng/mL).
Amphetamines detection windows by test type
Each specimen tells a different story because each samples different biology:
| Test type | Typical Amphetamines detection window |
|---|---|
| Urine | occasional: 1–3 days · regular: up to 4–5 days |
| Saliva (Mouth Swab) | any: 1–2 days (20–50 hours) |
| Hair Follicles | up to 90 days |
| Blood | any: ~12–24 hours |
('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
Amphetamines are on every standard panel including the federal 5-panel. A prescription does not exempt you — it explains the result. Take your prescription (or pharmacy printout) to the collection site or have it ready for the Medical Review Officer call; verified prescriptions are reported as negative.
lisdexamfetamine is a prodrug: your body converts lisdexamfetamine into d-amphetamine after ingestion, so it produces a normal amphetamine-positive result indistinguishable timing-wise from mixed amphetamine salts.
Illicit methamphetamine also breaks down into amphetamine, which is why meth confirmations require both methamphetamine and its metabolite amphetamine above thresholds — separating prescription-amp users from meth users.
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
Urine: 500 ng/mL initial screen; GC–MS confirm at 250 ng/mL requiring d-amphetamine (methamphetamine confirm additionally requires methamphetamine ≥250 ng/mL). 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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Does mixed amphetamine salts Show up Drug Test?
Yes — Amphetamines appears on standard drug panels. Full guide →
How Long Do Amphetamines Stay in Your System?
How long Amphetamines stays detectable in your system (all test types) — urine, hair, saliva & blood windows explained with cutoffs. Full guide →
How Long Do Amphetamines Stay Detectable in Urine?
How long Amphetamines stays detectable in urine — urine, hair, saliva & blood windows explained with cutoffs. Full guide →
Will mixed amphetamine salts Make You Fail a Drug Test?
Can Amphetamines trigger a false positive? Cross-reactivity evidence, confirmation testing, and how to clear your name with the MRO. Full guide →
How Long Do Amphetamines Stay in your Urine?
Urine detection runs roughly 1–3 days after last use; hair extends to ~90 days and saliva stays within 24–72 hours. Full breakdown in our detection guides.
How Long Does mixed amphetamine salts Stay in your Urine Drug Test?
Urine detection runs roughly 1–3 days after last use; hair extends to ~90 days and saliva stays within 24–72 hours. Full breakdown in our detection guides.
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.
Related guides
mixed amphetamine salts / amphetamines Drug Test Guide: Panels, Detection Windows & More
Does mixed amphetamine salts Show up Drug Test
How to Flush mixed amphetamine salts Out of System for Drug Test
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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)