There often is mucgh overlap among ADHD, Bipolar D/O and Oppositional Defiant Disorder. And Fetal
Alcohol Syndrome can yield a number of
emotional, behavioral and cognitive difficulties, icluding limited IG, impulsivity and unstable/inconsistent behavior. But medication is used to address particular symptoms, regardless of the diagnosis (a particualr symptom itself can be symptomatic of any number of conditions). It's not the diagnosis that's treated, it's the symptom(s).