How Long Do Drugs Stay in Your System?
Thursday, January 22nd, 2009The following list describes, on average, how long certain drugs tend to stay in a person’s body after the last dosage, determining the period of time that they can be detected by urine tests. It can take anywhere from a few hours to a few weeks for the body to rid itself of toxins depending upon the weight and chemical composition of a person. It’s possible for substances, foods and physical ailments to produce false positives in a urinalysis, information that is also included in the list below. In case you are anticipating a drug test, it’s wise to avoid those substances that could potentially yield a negative outcome, although most false positives can be ruled out by confirmatory testing.
Amphetamine: Up to 30 hours on low dose; 5 days on high dose
Possible false positives: Decongestants, like Sudafed; some varieties of OTC and prescription diet pills, like Dexatrim; the antidepressant Zoloft
Barbituates: 7 days for long-acting; 2-3 days for intermediate-acting; 1-2 days for short-acting
Possible false positives: None
Methadone: 7.5-56 hours
Possible false positives: Unisom Nighttime Sleep Aid
Heroin: 1-4 days
Possible false positives: Some antibiotics, like Cipro; cold remedies with dextromethorphan; poppy seeds produce a true positive test because they are the natural source of opiate drugs
Valium: 2-4 days for low dose (although very small doses may not be detected at all); 3-7 days for higher dose.
Possible false positives: None
Marijuana: 7-34 days for once weekly use; Up to 81 days for heavy daily use
Possible false positives: Hemp; Ibuprofen; controversy is stirring over the possibility that second hand inhalation can produce false positives
Cocaine: 8-48 hours
Possible false positives: Tonic water; diabetes
Quaalude: Up to 90 hours
Possible false positives: None
PCP: 5-10 days
Possible false positives: Thioridazine, an antipsychotic drug
Alcohol: Arguably 8-10 hours
Possible false positives: None
As always it is better to be drug free - if you or a loved one need addiction treatment give us a call.
