HI, and welcome
Wellbutrin is not a first line med for ADHD, but it is commonly used in kids with Mood Disorders. Some studies have shown that it is as effective as Ritalin in some kids, and although it is not approved it is used " off label". ALot of meds are either not approved for kids, not for kids under a certain age etc, but are used...several come to mind.
Has the Psychiatrist mentioned what type of mood disorder? Sometimes, the mood problem has to be controlled bfore ADHD meds( stims) can be used.
My experience with it is for one week total. DD was prescribed it by a * cough cough*Psych( he has since been suspended) when she was 6, he said she was "depressed", and she went ballistic. This is a kid who is NOT hyper, NO behavior isssues, and suddenly she WAS. I would have sworn she was insane the way she acted. We stopped it, and within a week she was back to normal...she took it 3 times total.