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I have adult ADD, been trying meds for 23 years now, I am 48. One time I compared the release amount of the 36 and 18 because I thought the 36 was not working. Concerta brand 18mg releases more medication at the beginning than a 36mg concerta. You can actually feel the difference because of the initial dump. The 36mg tends to release longer with less dump at the beginning. Also brand is much better than generic, there is a correct measured clinical dose. Generics sometimes have more or less clinical dose due to parameters/tolerences of production.