Throw it in the trash. Get rid of it, horrible horrible horrible stuff, stay off all stimulents, you are having a bad reaction to it, as is typical of AS.
The stuff made my son "way way way" more autistic. (although that is the first time I ever heard of it said that way). He got so bad, I remember once picking him up at a Y program, and while the other kids played a game, he sat on a bench not looking at anyone screeching "eee eee" and making this odd finger movement, like he was squishing your head! ) We thought he had tourettes!
Basically though, he was right out of it. the school liked it though, because he withdrew into himself, and became easier to manage.
ADHD and AS can have a lot of similar symptoms. Sometimes they a Co morbid. Sometimes they are not.
Do you not pay attention because you have an attention deficiet, (sp?) or because you are constantly over stimulated with your environment and are "attracted" away from what you "should" be doing? If it is the latter, you are unlikely to find your "cure" in a bottle of ritalin. (Addreall is the same S*** different pile)
I had to pull my son out of school and HS him for 4 years due to the school wanting to drug him, but my knowing it made him sick.
There is another drug though, called Strattera. It is expensive so you need a drug plan, but it is very new for Attention problems, (2 years) and is NOT a stimulent.
I find it made my son go from ADHD from HELL to just regular ADHD! But better yet, it really helped with his anxiety. If you have trouble with Anxiety, this may be a good thing to try, as it kills two birds with one stone.
Best wishes.