Drug Detection Times

 

How Long Drugs Stay in the Body


 

Drug Detection Times in urine are expressed below in terms of lower and upper boundaries. The amount of time that a drug/metabolite remains detectable in urine can vary, depending on the following factors:

 

Amount and Frequency of Use: Single, isolated, small doses are generally detectable at the lower boundary. Chronic and long-term use typically result in detection periods near or at the upper boundary.
Metabolic Rate: Individuals with slower body metabolism are prone to longer drug detection periods.
Body Mass:  In general, human metabolism slows with increased body mass, resulting in longer drug detection periods. In addition, THC (marijuana's active ingredient) and PCP are known to accumulate in fatty lipid tissue. Chronic users, physically inactive users, and individuals with a high percentage of body fat in relation to total body mass are prone to longer drug detection periods for THC and PCP.
Age: In general, human metabolism slows with age, resulting in longer drug detection periods.
Overall Health: In general, human metabolism slows during periods of deteriorating health, resulting in longer drug detection periods.
Drug Tolerance:  Users typically metabolize a drug faster once a tolerance to the drug is established.
Urine pH: Urine pH can impact drug detection periods. Typically, highly acidic urine results in shorter drug detection periods.
Note: In a small percentage of cases, users may test positive longer than times shown - most notably in cases of long-term chronic abuse, in individuals with significant body mass and/or body fat, and in individuals with health related issues resulting in abnormally slow body metabolism. These detection times are based on urine analysis. Detection times for hair follicle, blood and saliva tests are much higher.

 

Drug Group

Time Range

Alcohol 48 hours or less
Amphetamines 2 to 9 days
Barbiturates Short-acting:  1 to 7 days
Long-acting (Barbital, Phenobarbital):  1 to 3 weeks
Benzodiazepines Short-term Therapeutic Use:  3 to 8 days
Long-term / Chronic Use:  1 to 3 weeks
Cocaine 3 to 7 days
LSD 2 to 8 days
Marijuana (THC) Casual Use:  4 to 14 days
Long-Term / Chronic Use:  1 to 4 weeks
Note:  THC, marijuana's primary active ingredient, is stored by the body in fatty lipid tissue. From there, it is slowly released into the bloodstream for up to several weeks - depending on the amount and frequency of use and the user's level of physical activity. In chronic and physically inactive users, THC may accumulate in fatty tissues faster than it can be eliminated. This accumulation leads to longer detection periods for these individuals. Also, users with a high percentage of body fat in relation to total body mass are prone to longer drug detection periods for marijuana.
MDMA (Ecstasy) 3 to 12 days
Methadone 3 to 12 days
Methamphetamines 3 to 12 days
Opiates 2 to 12 days
PCP (Phencyclidine) Casual Use:  3 to 10 days
Long-Term / Chronic Use:  1 to 4 weeks
Note: PCP is stored by the body in fatty lipid tissue. From there, it is slowly released into the bloodstream for up to several weeks - depending on the amount and frequency of use and the user's level of physical activity. In chronic and physically inactive users, PCP may accumulate in fatty tissues faster than it can be eliminated. This accumulation leads to longer detection periods for these individuals. Also, users with a high percentage of body fat in relation to total body mass are prone to longer drug detection periods for PCP.

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