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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 half-life is approximately 8 to 59 hours. At this point, half of the drug will be completely eliminated from the system. By doing a little bit of math, it is possible to conclude that methadone is capable of staying in your blood stream for 16 to 118 hours. According to this math, methadone can remain in your blood for approximately 5 days at the most.