All of the types of ADD have as their primary feature periodic impairment of the prefrontal cortex of the brain and dopamine involvement. Classic ADD is characterized by both hyperactivity and inattentiveness. It is usually quite easy to treat by a combination of a high protein diet, aerobic exercise, a stimulant such as Adderall or Ritalin, and possibly the supplement of L-Tyrosine. Often an anti-depressant is used as well.