How long for a clean piss?

Please use these figures as a guide only—they're based on averages in the population. See the Drug testing FAQs fact sheet for more information.

Drug	Urine	Blood
Depressants
Alcohol	24–48 hours	8–24 hours
Benzodiazepines (tranquilisers)	1–6 weeks	1–100 hours
Cannabis - single joint - heavy smoker	18 hours–5 days 60–90 days	20–36 hours 20–36 hours
Opiates - heroin - morphine - opium - codeine	24–48 hours 72 hours 72 hours 72 hours	30 min–3 hours 2–3 hours 1–4 hours 2–4 hours
Stimulants
Amphetamines	72–96 hours	4–8 hours
Methamphetamines	72–96 hours	4–8 hours
Cocaine	24–48 hours	0.7–1.5 hours
Ecstasy	72–96 hours	4–8 hours
Hallucinogens
LSD	24–48 hours	2–4 hours
Psilocybin (magic mushrooms)	24–72 hours	30 min–6 hours
Mescaline	48–72 hours	N/A
PCP	24–120 hours	7–46 hours
Prescription
Ritalin/Adderall	72–96 hours	4–8 hours
OxyContin/MS Contin	72 hours	1–2 hours
Sudafed	72–96 hours	5–8 hours
Other
Ketamine	48–72 hours	2–4 hours
GHB	8 hours	N/A

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