does tolerance really have a ceiling  i have high-functioning impulsive-type adhd and was on concerta for a few years but stopped for two reasons 1 i heard about having to increase dosage over time and being at 54mg already i was worried it would be ineffective sooner than later 2 i wasn’t sure it was doing anything anymore that last point must be normal right once something becomes your new normal it can be easy to forget how it used to be  i guess i also stopped taking it because i wanted to try and function without medication and i didn’t want anything unnecessary in my body if i didn’t need it my wife would probably suggest i give it another shot