How does methadone work?

Methadone treatment works for heroin addicts, but also for chronic pain and any other signs of addictions I have been on methadone for 5 years. Here is how it went for me: I finally told my MD I was addicted to hydrocodone (Vicodin or Lorcet). I said I didn't think I could quit cold turkey on my own, and wanted to find out more about methadone. My doc referred me to a nearby methadone clinic. I had an appt with an intake counsellor. I found out all about the program, what the fees were, rules, etc., and had the opportunity to ask questions. I went to have a physical as was part of the program. I came back next for the actual dosing of the methadone. They started me on 20mg, and every couple days went up. I ultimately stopped at 75mg, which is where I have stayed all these years. It took me several months of following the rules and going to counselling to get take out privileges, and after a year clean, I only had to go to the clinic every 2 weeks to pick up my meds. The clinic in NC only charged me $224 a month. When we moved to Maine, that figure rose uncomfortably to $340. So costs vary greatly. I have done well on methadone, I don't crave opiates, I don't have any withdrawal. I feel good, my moods are good. I feel how I would think "normal" would be for someone not experiencing depression or opiate addiction.