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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.
for the person wanting to know how long methadone stays in the body for the answer is 3 days. i have been on methadone for 2 years. also most places dont test for methadone i had drug tests for jobs and the methadone didnt show up. they have to specificly test for that and its rare. (audcamgia from new york) Reply.