Naloxone Drug Test Guide: Panels, Detection Windows & More
Evidence-based answer reviewed against SAMHSA cutoffs and FDA assay documentation · Updated September 2026
Quick answer: Opioid antagonist (emergency reversal agent) — not included on the federal 5-panel. Urine detects it roughly not tested / no interference; hair archives ~90 days; saliva and blood track only recent use. Never screened on any standard or expanded employment panel.
Overview
This guide covers everything verifiable about how testing handles Naloxone (opioid reversal agent) (also searched as: narcan, evzio, opioid antagonist): which panels include it, detection windows across specimens, cutoff levels, false-positive risks, and legitimate prescription handling.
Panel membership
| Panel | Naloxone status |
|---|---|
| 5-Panel | ❌ Not included |
| 10-Panel | ❌ Not included |
| 12-Panel | ❌ Not included |
| DOT 5-panel (safety-sensitive) | ❌ Not included |
Detection windows
| Test type | Typical Naloxone detection window |
|---|---|
| Urine | any: not tested / no interference |
| Saliva (Mouth Swab) | any: n/a |
| Hair Follicles | n/a |
| Blood | any: n/a |
Cutoff levels
Never screened on any standard or expanded employment panel.
Cutoffs exist to separate real use from noise — dietary exposure, passive contact and legacy medications stay below them by design. Screen-above-cutoff results still require mass-spec confirmation before reporting.
Deep-dive facts
Naloxone is an opioid antagonist used to reverse opioid overdoses — it is not a drug of abuse and produces no intoxication. It appears on no standard or expanded drug panel, and it does not cause positives for opioids or any other screened drug.
If you administered naloxone to someone else (or received it yourself during an overdose), it will not show up on your own drug test. The only interaction to know about is medical, not testing: naloxone can precipitate withdrawal in opioid-dependent people.
The 'does Narcan show up on a drug test' question is common because people carry or administer it in emergencies. The answer is no: no panel screens for it, and it has no cross-reactivity with any standard immunoassay.
False positives & cross-reactivity
- None — naloxone has no documented cross-reactivity with any standard drug immunoassay.
| Screen flagged | Documented cross-reactants (immunoassay tier only) |
|---|---|
| Amphetamines | Bupropion (bupropion), trazodone, phentermine, pseudoephedrine, labetalol, promethazine, methylphenidate |
| PCP | Dextromethorphan (dextromethorphan cough syrup), diphenhydramine (diphenhydramine), doxylamine (multi-symptom cold remedies), tramadol, venlafaxine (venlafaxine), ketamine |
| Opiates | Poppy seeds (true positive), quinine, dextromethorphan, ofloxacin/levofloxacin, rifampin |
| Benzodiazepines | Sertraline (sertraline), oxaprozin (case reports) |
| Methadone | Diphenhydramine, doxylamine, verapamil, quetiapine (quetiapine), clomipramine |
| Tricyclics (TCA) | Cyclobenzaprine (cyclobenzaprine), hydroxyzine, carbamazepine, diphenhydramine |
| Cannabinoids (THC) | Efavirenz, pantoprazole (isolated reports); dronabinol/dronabinol = true positive |
Legal status note
Rx/emergency medication; not a controlled substance.
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Naloxone Drug Test Guide: Panels, Detection Windows & More?
Complete Naloxone drug test guide: which panels detect it, urine/hair/saliva/blood detection windows, cutoff levels and prescription verification. Full guide →
How Long Does Naloxone Stay in Urine?
How long Naloxone stays detectable in urine — urine, hair, saliva & blood windows explained with cutoffs. Full guide →
How accurate are drug tests?
Lab-based immunoassay screens agree with confirmation testing ~97% of the time; confirmed GC–MS results are considered definitive. Home kits trade legal defensibility for convenience.
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)