What Will cyclobenzaprine Show up As on a Drug Test?
Evidence-based answer reviewed against SAMHSA cutoffs and FDA assay documentation · Updated August 2026
Quick answer: No — not on any standard panel. Muscle relaxers is absent from routine 5-, 10-, and 12-panel employment drug tests. Not directly screened; cyclobenzaprine cross-reacts on tricyclic-antidepressant (TCA) screens.
Which panels screen for it
| Panel | Muscle relaxers status |
|---|---|
| 5-Panel | ❌ Not included |
| 10-Panel | ❌ Not included |
| 12-Panel | ⚠️ May flag TCA strip |
| DOT 5-panel (safety-sensitive) | ❌ Not included |
The details that matter
Muscle relaxers aren't panel targets, BUT cyclobenzaprine (cyclobenzaprine — structurally a TCA cousin) flags tricyclic screens that some 12-panel-plus cups carry, and carisoprodol's metabolite meprobamate is itself a monitored barbiturate-like compound.
If a TCA strip flags after cyclobenzaprine, the MRO matches your prescription and reports accordingly.
If it IS detected, how long does it last?
| Test type | Typical Muscle relaxers detection window |
|---|---|
| Urine | any: 2–4 days (cyclobenzaprine half-life ~18 h) |
| Saliva (Mouth Swab) | any: n/a |
| Hair Follicles | n/a |
| Blood | any: n/a |
False-positive notes
- Cyclobenzaprine → TCA-screen FP: documented. Quetiapine/hydroxyzine share TCA-strip risk.
Remember: immunoassay screens produce artifacts; mass-spec confirmation and the MRO review are where legitimate explanations win.
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No — standard employment panels don't include Muscle relaxers. 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)