juve didn't you mean Methamphetamine? Ritalin and Adderall are like weak speed, that makes you really concentrate. MDMA, although a stimulant, is not anywhere near what they prescribe for ADD/ADHD. Both Ritalin and Adderall are highly addictive if you used consistently for only a short time, and withdrawl from them is just like any other drug. They work, but I would not take these on a regular basis. I have serious problems concentrating, especially when trying to study and retain information, and I occasionally take adderall for these situations, but I do not take it on a regular basis, and never would.