You really don't want to do that, it isn't going to be much better than taking it orally.
If for some reason you are still considering doing this, I would read the last link in my signature. Without micron filtration, it will be too unsafe to inject Adderall (still may be too risky even with a micron filter, I am not sure).
Finally, questions like this don't belong in New Member Introductions. I'm going to go ahead and close this thread. If you aren't sure why I closed it, feel free to PM me.