Methadone is a (synthetic opiate) narcotic that when administered once a day, orally, in adequate doses, can usually suppress a heroin addict's cravingand withdrawal for 24 hours. Patients are as physically dependent on methadone as they were to heroin or other opiates, such as Oxycotin or Vicodin. Each time an addict uses heroin, there is a cycle of consisting of intoxication, initially, followed by a period of normal mental functioning which then yields to the discomfort of withdrawal and craving (flu-like symptoms with pain, anxiety and depression).
The cycle that repeats every 4 to 8 hours with heroin is eliminated by expert methadone

maintenance treatment. This is possible because methadone is released more slowly into the system and lasts much longer than heroin and most other opiates. Short acting opiates, like heroin, hydrocodone and morphine perpetuate and/or create abnormal processes in the brain, which interfere with feeling normal and functioning normally. Taking methadone, instead, stops most aspects of this destructive process while normalizing important neurobiological functions. After stabilization on the proper dose, methadone does not produce the rush or “high” associated with heroin abuse.