Neurotransmitters in Various Disorders:
  Major Depressive Disorder Generalized Anxiety Disorder Panic Obsessive Compulsive Disorder Premenstrual Dysphoric Disorder Phobia Smoking ADHD Obesity
Serotonin X X X X X X      
Norepinephrine X X X     X X X X
Dopamine X           X X X
Source: American Psychiatric Association 155th Annual Meeting, May 18 - 23, 2002