Adderall works very well for me even though I get muscle seizures and tension in neck and shoulders when I take it. I had the above mentioned symptoms beforehand but it is worse when I take Adderall. I went for physical therapy two times as the spasms caused got worse. I felt numbness on my limbs too. I do not know if anyone else has this problem though my doctor says majority of people affected by ADD have type A personality giving tension in the neck area.