Undefined how long does methadone stay in ones system?

Methadone can generally be detected in the body for varying lengths of time, depending on several factors, including dosage, frequency of use, and individual metabolism. Typically, methadone can be detected in urine for about 3 to 7 days after the last dose, while it may remain in blood for up to 1-3 days and in hair for several months. However, its long half-life, which can range from 8 to 59 hours, means it may take longer for some individuals to fully eliminate it from their system. Individual variations, such as age, health, and liver function, also play a significant role.