I've changed my medication for my A.D.D and I was taking Adderall xr 20 mg . And Im just wondering if theres any difference inbetween the the two medications. Adderall xr 20 And concerta 36 mg . If some could post a link to any info on this or give me a response to my question . You'll be saving me alot of time looking for a straight answer or at least understand the differences inbetween them both :)