i took Metadate CD for a couple of months for my ADHD (impulsive and hyperactivity) Started out on 20 mg (says 20 on capsule) and then after a month, went to 40 mg a day of it. i still had trouble focusing, temper tantrums, not finishing tasks, unmotivated, and saying impulsive comments. I feel that Metadate CD helped, but lasted NOT long enough for me. It only lasted about 7-8 hours for me. Concerta was then tried as well as short Ritalin. Concerta is much smoother than s.a. Ritalin! Supposed to last 10-12 hours, and usually does for children. i felt depressed and tired, though on the methylphenidate products. Now i take Adderall XR in morning, and regular Adderall in afternoon. It works much, much better for decreasing hyperactivity, no temper tantrums, getting motivated and not feeling impulsive, also, of course, sticking to ONE task at a time methodically. Also, my mood has improved a great deal. So, it is a frustrating process, but hopefully you'll get there sooner than later! i wish you and your son the best!