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Typically, it is possible to detect methadone in the urine for 2 to 4 days after it has been used, which implies that this is the period for which methadone stays in your system. On the other hand, the detection window of methadone in blood is approximately 24 hours, while that in saliva is about 1 to 10 days.
The drug lasts about 4-6 hours. Dosage depends on body weight, medical need and age. 10 mg will last just as long as 30mg in your system but the effect will be greater.Addera â¦ ll XR lasts for about 10-12 hours.mphetamines are standardly detectable in urine for 1-3 days after use. Methamphetamines stay in the system slightly longer, 3-5 days. The Amphetamine test is a one step competitive immunoassay that is used to screen for the presence of amphetamine in urine.