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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.
Since methadone has a double life, it may take up to 2 days to start experiencing withdrawls, and if not weened properly, withdrawls symptoms can last from 30 days to 90 days, depending on your metabolism. Methadone is fat soluable, it stays in your system longer so excretion and withdrawl can be lengthy.