You can search for trials, but you probably can't join any because the 1% Treaty hasn't passed yet. Most trials are severely limited by lack of funding and bureaucratic barriers. Help change this!
Active Clinical Trials
2 active trials recruiting for Methylphenidate (Ritalin, Concerta) in Adhd
Medication Treatment of ADHD in Pediatric Epilepsy
Efficacy and Safety Study of Methylphenidate Hydrochloride Extended Release in Adults With Childhood-onset Attention Deficit/Hyperactivity Disorder (ADHD)