BMJ - "Methylphenidate for attention-deficit/hyperactivity disorder in children and adolescents: Cochrane systematic review with meta-analyses and trial sequential analyses of randomised clinical trials"

"Methylphenidate for attention-deficit/hyperactivity disorder in children and adolescents: 
Cochrane systematic review with meta-analyses and trial sequential analyses of randomised clinical trials"

"What this study adds The results suggest that among children and adolescents with a diagnosis of ADHD, methylphenidate may improve teacher reported symptoms of ADHD and general behaviour and parent reported quality of life. However, given the risk of bias in the included studies, and the very low quality of outcomes, the magnitude of the effects is uncertain. Methylphenidate is associated with an increased risk of non-serious but not serious adverse events."

http://www.bmj.com/content/351/bmj.h5203