DS3. difficult child 1 was diagnosed with ADHD when he was 3. He was diagnosed with ODD when he was in 3rd grade. This last January, it was changed to Autism Spectrum Disorders (ASD). His defiance was because because of his rigid, literal, black-and-white thinking; inability to see the other person's point of view; inability to generalize; and strict adherence to routines.
As for the Adderall in your situation, if it doesn't seem to be helping at all, you might want to consider asking about non-stimulant alternatives. Stimulants (they tried 3) did NOT work for difficult child 1 but the Strattera is working wonders. on the other hand, I have heard some people have had negative experiences with Strattera. It's almost a crapshoot with medications when it comes to individual effectiveness. I have since heard from MANY parents here that stimulants and Autism Spectrum Disorders (ASD) are not a good combination.
Good luck. Keep questioning, researching, and pushing for anwers. When you have a clear picture of what all is really going on, life gets better.