i was also on the
maximum dose of suboxone 32 mgs of suboxone daily, split
dose, 16 mgs in the morning, and 16 mgs at night, for just under 6 weeks, at this time i was able to taper quite rapidly down to 10 mgs. ( i have since gone up and back down again in sub dose to try to help with some chronic pain i have)
if he was on a stable dose of 20 mgs (only) of methadone (which i wasnt) for an extended amount of time he may not have this problem.