Hey jpb, Well done taking your first step towards stability.

I have been a Heroin addict for 7 years and on methadone for six. Methadone as a treatment is debatable. The point in its use is to get you stable and off street drugs. And to this degree it works very well.
However used over the long term will, ruin your teeth, your sleep pattern and kill your libido. If you still have one after using H.
There are things you can do to lessen these effects, and the less time on it the better. If you can use it as a stepping stone to Subutex or similar, is by far your best bet.
If you have any more questions, please feel free to pm me.

Please don't be put off the program, just try and remember what it's really meant for. All the best. And good luck.