Quick answer
Barbiturates is typically detectable in urine for 1–3 days (secobarbital) after short_acting; phenobarbital: up to 3 weeks after long_acting. It is screened on standard 10-panel, 12-panel drug tests.
Screened on: 10-panel 12-panel
Typical cutoff: Expanded urine: 200–300 ng/mL (long-acting equivalents).
Detection window by test type
| urine | |
|---|---|
| short_acting | 1–3 days (secobarbital) |
| long_acting | phenobarbital: up to 3 weeks |
| saliva | |
| Any use | ~1–3 days |
| hair | |
| Any use | up to 90 days |
| blood | |
| Any use | 1–4 days (phenobarbital longer) |
Ranges reflect typical published detection windows and vary with dose, frequency, body composition, hydration and the assay used.
Key details
Barbiturates ride along on 10/12-panel cups as the legacy 'BAR' strip. Prescriptions are uncommon today (butalbital migraine combos like Fioricet persist).
Phenobarbital's 4-day half-life makes it the outlier — weeks-long urine detection versus days for shorter agents.
Fioricet/Butalbital prescriptions verify through the MRO.
Frequently asked questions
How long does barbiturates stay in your system?
In urine, typical detection is 1–3 days (secobarbital) (short_acting); phenobarbital: up to 3 weeks (long_acting). Hair can detect use for up to 90 days and saliva/blood windows are usually shorter.
Will barbiturates show up on a standard drug test?
Yes — Barbiturates is screened on standard panels (10-panel, 12-panel).
How accurate are these detection windows?
They are typical ranges from published literature and assay documentation, not guarantees. Clearance depends on dose, frequency, metabolism and the specific test cutoff used.
Related substances
Cite this page
DrugPanels. “Barbiturates Detection Time.” https://drugpanels.com/detection/barbiturates/. Accessed 2026-09-10.
Sources
- FDA drug labeling and pharmacokinetic data (DailyMed) — U.S. Food and Drug Administration — dailymed.nlm.nih.gov
- SAMHSA drug testing resources and analyte specifications — Substance Abuse and Mental Health Services Administration — samhsa.gov
Detection windows describe typical ranges from the published literature and assay documentation; individual results vary. See our methodology.