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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.
1 However, for most people, detectable levels (i.e., shows up as a positive in a laboratory drug test) of the following drugs stay in the body for these approximate periods of time. 2  Methadone, 1-7 days. 3  Depends on use. one time -3 days. 4  maintenance use - 1 week. 5  As for adequate dosing and effects approx.