Probably something that we should've touched upon already, is the wildly different practices in regard to the prescribing of Methadone from country to country or even between states/provinces. In the United States, the DEA is the Reichschancellor of all Methadone programs. Methadone can only be given to known addicts for purpose of addiction maintenance, at a clinic. This is typically a brick and mortar outfit where one attends 7 days per week to consume a dose under supervision. Liquid Methadone has become by far the most common form used for addictive maintenance purposes, although 40mg wafers are still used in some hospitals and addiction programs.
If you are prescribed Methadone for analgesia in the United States, it means almost universally 5mg and 10mg tablets. Methadone elixir is not prescribed for analgesia in the United States. It's my understanding that the laws are considerably more lax in Canada and that there are significantly more possible locations (pharmacies), at which the patient can get dosed each day. In the United States, it's not unheard of for folks to drive 2 hours each way to an urban center, every single day, to obtain Methadone.
I can only speak truly for the American system. Although, I'm going to close this, simply because it's not really something that would typically fall within our purview.