If a child is given ADHD meds of different types, and none work, is it safe to say that ADHD is not the problem?
Needs evaluation. No , he should be evaluated by neuro develop mentalist, psychiatrist or your pediatrician.
ADHD is complex. Adhd must be differentiated from many other conditions & often is comorbid with (accompanies) many other conditions. Response to adhd meds does not confirm a DX & lack of response doesn't mean the person doesn't have adhd. A detailed evaluation & treatment by a skilled professional is necessary. Some children will not respond to the adhd meds before age 6 but may respond later as they develop.