A word of caution when switch Opioid MATs without doing your research. In this case, they brought him off Methadone too quickly to really add to the misery.
Microdosing and in my case helping a friend, I switched him from Heroin to Bupe (Subutex) using bucal Fent patch square cuttings and Meth, when he couldn't handle it. It only took 24 hours and handled it surprisingly well.
I hope this may help somebody one day.