I saw a chart that said 1-7 days for urine and 24 hours for a blood test, i just find that hard to believe that it lasts longer in urine and only 24 hours in a blood test? Like i said im 6'2'' and about 175 pounds give or take. my daily dose is 85 mgs of the liquid Methadone and i have been taking it for going on 3 months now. If any one can give me any kind of an idea of how long liquid Methadone can be detected in a blood test for i would greatly appriciate the info because i have to take a blood test that is testing for it. thanks in advance
This question has also been asked and answered here: How long does Methadone stay in your system?
4 Aug 2011
The reason that it is detectable in urine longer than blood is because the medicine goes into the blood first, then is metabolized by being processed through the liver and kidneys and then excreted. The process of elimination is longer than the initial time circulating in the blood. The urine has what are called metabolites of the medicine in it which are the breakdown products of the elimination process. Anyway, the detection times you have are accurate.
This chart shows that methadone is detectable for 6 hours in the blood.
Hope this helps,
4 Aug 2011
This is true. It is about 24 hours If you think about it, it does make sense. Urine is the excretion of a drug so they are testing for the drug and the changed metabolites. Drugs are detectable in the blood while they are acting and before they are processed and eliminated by the body so the detection times for blood are going to be less than urine. Drugs can be detected in the urine way longer than the blood because it is detecting the drug being eliminated by the body so the person may not still be under the influence of the drug but the body is still getting rid of the metabolites. If you were testing for intoxication you would want to test the blood because that would be a more accurate picture of what is actually circulating in the body. The urine could show something the person ingested days ago but is still not under the influence of. I hope that explaination makes sense!
13 Apr 2012
Just to add an extra note. If you have been under long-term treatment of methadon, it has saturated most of the tissue in your body. Metabolic and killer cells will slowly work this buildup out, but along the way there will be small, often just minute, but still present traces of methadone's metabolites in your urine, though not likely in the blood. Blood is a tissue, but by nature of state at room temperature and it's constant cycling it doesn't carry more than, I agree, 24 or so hours of detectable methadone after usage.
- Methadone Information for Consumers
- Methadone Information for Healthcare Professionals (includes dosage details)
- Side Effects of Methadone (detailed)
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