Quick answer
Codeine / promethazine ('lean') is typically detectable in urine for 1–3 days (codeine) after any use. It is screened on standard 5-panel, 10-panel, 12-panel, DOT drug tests.
Screened on: 5-panel 10-panel 12-panel DOT
Typical cutoff: Covered by the standard opiate strip: 2,000 ng/mL morphine/codeine.
Detection window by test type
| urine | |
|---|---|
| Any use | 1–3 days (codeine) |
| saliva | |
| Any use | 1–2 days |
| hair | |
| Any use | up to 90 days |
| blood | |
| Any use | ~12–24 hours |
Ranges reflect typical published detection windows and vary with dose, frequency, body composition, hydration and the assay used.
Key details
Lean's codeine lands squarely on the classic opiate panel — this is one street drug standard testing catches without any expansion.
Promethazine itself isn't screened, but it can flag old-generation amphetamine screens as a false positive; confirmation sorts it out.
Prescription codeine (Tylenol #3, cough syrup) verifies via MRO like any opioid script.
Frequently asked questions
How long does codeine / promethazine ('lean') stay in your system?
In urine, typical detection is 1–3 days (codeine) (any use). Hair can detect use for up to 90 days and saliva/blood windows are usually shorter.
Will codeine / promethazine ('lean') show up on a standard drug test?
Yes — Codeine / promethazine ('lean') is screened on standard panels (5-panel, 10-panel, 12-panel, DOT).
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. “Codeine / promethazine ('lean') Detection Time.” https://drugpanels.com/detection/codeine/. Accessed 2026-09-10.
Sources
- Brahm NC et al., Commonly prescribed medications and potential false-positive drug test results, Mayo Clinic Proceedings 2008 — Mayo Clinic Proceedings — pubmed.ncbi.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.