I have concerns over handing this stuff out like lollies, or treating the issue of addiction lightly.
I have four kids who, like me, are avid gamers.
Moderation (as in all things)is the key, and that responsibility falls to the parents or primary caregivers.
Personally, as a pychologist with some experience with addiction, I don't feel that any parent should just jump for the latest fad in pills as an effective response ... to me this is lazy, and an abrogation of the role of a parent.
First response should be to monitor your child's on-line and single player game time, and balance their activities to ensure they are getting enough exercise, and stimulation through real social activities ... not throwing them in front of a PC or TV for huge chunks of time just so you can have more "quality time" to yourself.
Looking up the adverse effects / contra-indications etc on a drug of this class should make any parent think twice about going down this path without significant forethough.
Seek advice from your paediatrician, psychiatrist, and psychologist first.
In saying that, pharmacology has come a long way as an effective treatment, but as always, you need to treat the issue wholistically, and that means helping the person on a range of fronts.
Thanks Jane.
/end rant