Does Phentermine Show Up on a 5-Panel Drug Test?
Evidence-based answer reviewed against SAMHSA cutoffs and FDA assay documentation · Updated August 2026
Quick answer: Depends on configuration. Phentermine appears on some 5-panel cups depending on manufacturer and program.
What a 5-panel drug test actually tests for
Here's the full drug list with typical urine cutoffs:
| Drug class | Typical urine cutoff |
|---|---|
| THC (marijuana) | 50 ng/mL urine initial / 15 confirm |
| Cocaine (benzoylecgonine) | 150 / 100 ng/mL |
| Opiates (morphine, codeine, 6-MAM heroin marker) | 2,000 / 2,000 ng/mL |
| Amphetamines (mixed amphetamine salts class) | 500 / 250 ng/mL |
| PCP | 25 / 25 ng/mL |
| Phentermine | ❌ Not detected |
Who uses this panel
The federal standard since the Reagan era — still the DOT-mandated panel for CDL drivers, aviation, maritime and other safety-sensitive work.
What candidates should know
Phentermine is an amphetamine cousin. Immunoassay screens frequently flag it, and unlike classic false positives, the drug genuinely belongs to the flagged class — GC–MS confirmation identifies PHENTERMINE specifically, which the MRO matches against your weight-loss prescription.
Always declare phentermine/phentermine at collection time; an unexplained amphetamine-flag starts the review process the hard way.
Not on this panel? Read this
Absence from a panel means absence of testing — not safety. Specialty orders, expanded cups, probation panels and sports programs reach further. If your situation involves court supervision, treatment programs or safety-sensitive certification, assume wider coverage.
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Does phentermine Show up on a 5 Panel Drug Test?
No — standard employment panels don't include Phentermine. Only specialized orders reach it.
Does Phentermine Show up on a 5 Panel Drug Test?
No — standard employment panels don't include Phentermine. Only specialized orders reach it.
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.
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)