Amphetamine / dextroamphetamine
"I have Bipolar disorder and have ADD (not ADHD) for which I was on Ritalin (methylphenidate).  My doctor switched me to Adderall because my concentration seemed to be waning again, but I don't believe it is working as well. Concentration is about the same, but it seems I am experiencing a lot more anxiety now than I did with the Ritalin."