"i am 21, i&#039;m studying in physics and i have been on adderall for almost 2 years now. i started at 15 mg and i am now at 25 mg. it was good the first year, very effective. but now, i don&#039;t think it really helps. i feel sleepy with it and i lost attention very quickly. i don&#039;t think the dose is the problem, i feel the effect and i think that increasing the dose will augment the anxiety cause by it (i noticed that each time i had to augment the doses, the side effects was worst). 

i&#039;m gonna return to ritalin tonight, it was way more effective. or maybe another one with methylphenidate. concerta didn&#039;t works for me, maybe biphentin should."