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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.
So, how long does methadone stay in your system? Basically, urine tests can detect traces of methadone up to 2-4 days after you last used the drug. Of course, depending on certain factors, the results might be influenced to a certain degree: How long you have been taking methadone for. How often you take methadone. Your height and weight.