What are the differences between anti-depressants and anti-adhd medications?

Worlds apart. Most antidepressants increase serotonin. Most adhd meds increase Dopamine & norepinephrine. Some antidepressants help adhd like atomoxetine. Some antidepressants work on norepinephrine or Dopamine as "dual action" meds. Some adhd meds worsen depression.
Huge! Antidepressants work on neurotransmitter systems in the brain while add meds work on the reticular activating system.