Yes I can associate with this. My son is on Concerta and he is having involuntary twitched/spasm and grunting sound as if in pain.
I didn't know they could cause seizures. But if you think about it that could explain why it looks like I have tourettes. My eyes move constantly and I think that I concentrate just fine. I make vocal ticks and I twitch alot. It's really a sight to see what the drug Concerta has permanently done to me. I had a seizure due to them a while back and every since then I have twitched and vocally ticked. This was due to the fact that they put me on Concerta and Lithium and it had a reaction against my body. I'm not saying that it was due to the drugs but they should really go into more detail when they are telling parents or people in general about how these drugs will help their child or them. They should also tell how it could react against the body even though it is rare.
I know there are a lot of children that have been told they have add or adhd and autism that where later told they have Seizures. And where on drugs for add and adhd.
How many new the side effects of the drugs they where on could cause Seizures? And didn't find out about having Seizures until they where on these drugs like adderall and Concerta.