"let me explain what can go wrong here and what you may want to speak with your dr about. focalin xrs effect is much , much, much stronger than concerta or ritalin. this is very important to understand, so if you are thinking of switching to focalin xr from another medication do not go to a similar strength. i was on concerta 54mg and went to  focalin xr 40mg. this was a scary experience i got dizzy almost passed out and couldn&#039;t tell you what 1 1 was. it was horrible  to say the least. i discontinued the focalin and tried adderal. that made me grumpy and sick. i did research and found out about focalins potency. i am now on focalin xr 15mg and doing awesome."