How Long Do Drugs Stay In Your System?

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Drug detection factors

The length of time that a drug is detectable in the system depends on a variety of factors, including:

  • the type of test
  • dose
  • tolerance
  • potency
  • metabolism
  • the existence of medical conditions

Drug detection times

Please use these figures as a guide only:

  • Alcohol: 3-5 days in urine, 10-12 hours in blood
  • Amphetamines: 1-3 days in urine and around 12 hours in blood
  • Barbiturates: 2-4 days in urine and 1-2 days in blood
  • Benzodiazepines: 3-6 weeks in urine and 2-3 days in blood
  • Cannabis: 7-30 days in urine and up to 2 weeks in blood
  • Cocaine: 3-4 days in urine and 1-2 days in blood
  • Codeine: 1 day in urine and up to 12 hours in blood
  • Heroin: 3-4 days in urine and up to 12 hours in blood
  • LSD: 1-3 days in urine and up to 2-3 hours in blood
  • MDMA (ecstasy): 3-4 days in urine and 1-2 days in blood
  • Methamphetamine (crystal meth): 3-6 days in urine and 24 - 72 hours in blood
  • Methadone: 3-4 days in urine and 24-36 hours in blood
  • Morphine: 2-3 days in urine and 6-8 hours in blood

Drug detection in hair

Drugs or their metabolites may be detectable in hair. Hair grows at a rate of approximately 1cm per month so depending on the length of hair it may be possible to determine drug use over recent months.

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