My 24y/o grandson has been on Ritalin for many yrs. @ 20mg.3 times a day (max dose). It does not seem to be working like it used to . His memory has gotten worse (which he mentions himself). Any suggestions. He is unable to work due to developmental disability, but I do think there is a job of some type he might handle. He is so distracted if he was able to get hired at a grocery store taking out groceries he would start talking to the customer, pay no attention where he was pushing the cart, or if a car is coming. I am 70, and worry frequently about his future. Thank you, Sharon