Saliva (mouth swab) Drug Test

What a saliva (mouth swab) test detects and how long substances stay detectable.

Quick answer

Oral-fluid testing captures RECENT use: parent compounds linger in salivary glands roughly as long as impairment itself, making mouth swabs the impairment-proxy champion. Collection is observed-by-default (cheating-resis

Detection windows in saliva (mouth swab)

SubstanceTypical window
2C-Blimited data
2C-Ilimited data
4-AcO-DMTlimited data
Adderall / amphetamines1–2 days (20–50 hours)
Alcohol6–12 hours
Ambien (zolpidem)~8–12 hours
Anabolic steroidsrarely tested
Ashwagandhan/a
Baclofenn/a
Barbiturates~1–3 days
Benadryl / NyQuil (diphenhydramine & doxylamine)n/a
Benzodiazepines (Xanax, Valium, Klonopin, Ativan)1–3 days
Buspirone (BusPar)n/a
CBD (cannabidiol)not tested
Clonidinen/a
Coca (leaf and tea)1–2 days
Cocaine1–2 days
Codeine / promethazine ('lean')1–2 days
Creatinen/a
DMT~hours
DXM (dextromethorphan)up to about 1 day
Delta-10 THCup to about 72 hours
Delta-8 THC24–72 hours
Dilaudid (hydromorphone)1–2 days
Escitalopram (Lexapro)n/a
Etizolamhours to about 1 day
Fentanyl1–2 days
Fluoxetine (Prozac)n/a
GHB1–6 hours
Gabapentin (Neurontin)~1 day (research)
Hempn/a for seed or fibre
Hydrocodone (Norco, Vicodin)1–2 days
Hydroxyzine (Atarax/Vistaril)n/a
K2 / Spice (synthetic cannabinoids)1–2 days
Kavan/a
Ketamine~1 day
Khat (cathinone)hours
Kratom (mitragynine)~1–3 days (specialized)
LSD (acid)~8–12 hours (research)
Lidocainen/a
MDMA (ecstasy/molly)1–2 days
MDPVhours
Melatoninn/a
Mescaline (peyote)limited data
Methadone1–3 days
Methamphetamine1–4 days
Methylphenidate~1–2 days
Modafinil~1–2 days
Morphine1–2 days
Muscle relaxers (Flexeril, Soma, tizanidine)n/a
NBOMe (25I-NBOMe)limited data
NSAIDs (ibuprofen, naproxen, ketorolac)n/a
Naltrexone~1 day
Nicotine (smoking/vaping/Zyn)1–4 days (cotinine)
Nitazeneslimited data
Nitrous oxidenot detected
NyQuil & cold medicinesn/a
Ondansetronn/a
Opiates / opioids (heroin, morphine, codeine)1–2 days
Opium1–2 days
Oxycodone (Percocet, OxyContin)1–2 days
Ozempic / GLP-1 (semaglutide)n/a
PCP (angel dust)1–3 days
Peptides (BPC-157, ipamorelin)n/a
Phenibutlimited data
Phentermine (Adipex-P)1–2 days
Poppers (alkyl nitrites)n/a
Pregabalin (Lyrica)~1–2 days
Psilocybin mushrooms ('shrooms')~24 hours on specialized tests
Quetiapine (Seroquel)n/a
Salvia divinorumn/a
Sertraline (Zoloft)n/a
Sildenafiln/a
Suboxone (buprenorphine)1–4 days on specialized assays
Sudafed (pseudoephedrine)n/a (indirect)
Synthetic cathinones (bath salts)hours
Tianeptinelimited data
Tramadol (Ultram)1–2 days
Trazodonen/a (indirect)
Weed / THC (cannabis)24 hours
Weed / THC (cannabis)up to 72 hours
Weed / THC (cannabis)up to 72 hours
Wellbutrin (bupropion)n/a (indirect)
Wild lettuce (lactucarium)n/a
Xylazinelimited data
alpha-PVP (flakka)hours

Typical published ranges; individual results vary with dose, frequency, metabolism and the assay.

Frequently asked questions

How does a saliva (mouth swab) drug test work?

Oral-fluid testing captures RECENT use: parent compounds linger in salivary glands roughly as long as impairment itself, making mouth swabs the impairment-proxy champion. Collection is observed-by-default (cheating-resistant), windows stay short (24–72h typical), and contamination excuses (food, hygiene) hold little sway post-pH checks.

How long do drugs stay detectable in saliva (mouth swab)?

It varies by substance — see the table above. Longest windows: 2C-B, 2C-I, 4-AcO-DMT.

Is a saliva (mouth swab) test accurate?

Screening results are presumptive; a non-negative saliva (mouth swab) screen is confirmed by GC-MS or LC-MS/MS before being reported as positive.

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