methadone maintenance clients eventually reach a point where it is nearly impossible to ever successfully detox from the methadone, as it's withdrawal symptoms have been reported to be 10 times more severe than those of heroin and lasting sometimes as long as 3 to 4 months in duration, compared to the 7 to 10 days of withdrawal symptoms that an average heroin addiction can produce.
http://www.orangecountydetox.com/methadone_detox.htm
thought it might be good imfo to share?