Does Phentermine Show Up on a 10-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 10-panel cups depending on manufacturer and program.
What a 10-panel drug test actually tests for
Here's the full drug list with typical urine cutoffs:
| Drug class | Typical urine cutoff |
|---|---|
| THC | 50 / 15 |
| Cocaine | 150 / 100 |
| Opiates incl. heroin | 2000 / 2000 |
| Amphetamines | 500 / 250 |
| PCP | 25 / 25 |
| Barbiturates | ~250–300 |
| Benzodiazepines | ~300 / 200 |
| Methadone | ~300 / EDDP |
| MDMA | 500 / 250 |
| Propoxyphene/propoxyphene (legacy) | ~300 |
| Phentermine | ❌ Not detected |
Who uses this panel
The default 'general workforce' panel for many non-DOT employers — everything DOT tests plus depressants and ecstasy.
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 10 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)