"on it for 5 months now, and all i have to say is wow. i have battled nervousness, anxiety and a very, very low stress threshold for all my life (i&#039;m 32 now). it all changed when i started taking concerta. started with 16 mg., and felt a lot more relaxed, but also started to develop a foggy kind of feeling in my head. after 2 weeks the dose was upped to 36, and the foggy feeling subsided a bit. then on 54mg. 2 weeks later, it was like i could see things more clearly. my memory improved, i&#039;m &#039;sharper&#039;, actually feel smarter. all of my anxiety, nervousness etc. is gone. cons: had a persistent fungal infection for a while (on my foot) allergic reaction (redness), &amp; slight tinnitus, but all in all very, very satisfied. a life saver for me!"