Methadone rehab treatment is the process of undergoing treatment for those who are addicted to the use of methadone drug. So, for people who have fallen prey to methadone drug abuse, the best place to recover from it is a Methadone Rehab Treatment clinic. Apart from methadone, some of the illicit drugs that most people get addicted to include nicotine, marijuana, alcohol, opium, cocaine, heroin and much more.