>>270684995
that's ADD Attention Deficit Disorder
ADHD has the component of Hyperactivity
Excessive liveliness and constant need of stimulation drives the inability to hold attention because you're always seeking stimulation.

The same drugs work for both disorders because it's the same part of the brain chemistry/system acting up. 
ADD get wakefulness, focus and attentiveness. ADHD get calmed down mellowed out so they're not constantly driven to distraction.