ADHD affects 15.5 million US adults — but 36.5 percent receive no treatment, and most adults with the inattentive type were never diagnosed as children. This complete guide covers how adult ADHD looks different from childhood ADHD, the 3 DSM-5 presentations, Rejection Sensitive Dysphoria, the dopamine-prefrontal neuroscience, diagnosis criteria, the full 8-medication comparison table including stimulants, non-stimulants, and Modafinil, and the 69.6 percent comorbidity rate wi