Like gabapentin? I was on them for years, in theory to help with really bad restless legs (keeps me up all night). My normal ADHD meds are 60mg Equasym XR + 20mg methylphenidate SR.

The gabapentin never helped, even up to relatively high doses. I'm seriously suspicious that the long and short term side effects are under emphasised, especially for long term use. Titrating up felt bad, but coming off them was absolutely awful, probably one of the worse experiences I've had with medication. I don't normally get anxiety but it skyrocketed, and I was nauseous and groggy for weeks, even titrating really slow. Anxiety is still worse months later, and while I don't entirely trust my judgement on this, I do wonder if it's maybe had longer effect on me than is explained by just the half life.

Still pissed that my neurologist just dropped them on me and never really followed up!

Given the lack of info on official side effects, I do wonder if the methylphenidate did somehow interact with the gabapentin to make the whole thing worse, but that's just a conspiracy theory on my part.