i used to take 120-150 mg a day for pain management. but I abused it.
anyways,,,,,
yea, hes taking something else, or noone else has mentioned,
he may not be in w/d YET.
methadone builds in your system, and if you take a high dose, yes 100mg is high,
it can actually take FOUR TO FIVE DAYS to get into actual withdrawl symptoms.
Just wanted to add that.
I could usually 'handle' bout 3 days before FREAKING out
Just my two cents
good luck
Merry CHristmas!