The article discusses the impact of Adult attention deficit/hyperactivity disorder (ADHD) in Europe. In this article, the authors analyze the diagnosis of ADHD in adults, focusing on characteristics of this disease in Non-European and Europeans adults. The primary focus is the baseline characteristics of European and non-European adult patients with attention deficit hyperactivity disorder(ADHD), while participating in a placebo-controlled, randomized treatment study. This study found that there is no significant difference between European or Non-European with Attention Deficit Hyperactivity Disorder (ADHD) and they have similar characteristics and demographics. The study changes the perception about (ADHD), which most people are afraid of what they do not understand. The study presented the common perception that a hyperactive child in the mall or a disruptive child in school is associated with ADHD. However, the study concluded ADHD is just as prevalent in adults. The study indicated that in the European and Non-European adults spend most of the adulthood impaired because they have gone underdiagnosed in many European countries. However, the primary contribution is the similarities in characteristics between the ADHD adults both European and Non-European. The article explained that European adults that are left untreated for ADHD often are perceived as troublemakers unable to cope with society or lazy. However, the article raised the awareness level that ADHD is a disease that impairs the individual’s neurological system. In many the European countries, professionals working in the adult mental health field may not know that ADHD frequently persists well into adulthood. The article discusses the impairments of ADHD adults that are misunderstood by the European public. The article indicated that adults with ADHD in Europe often go untreated for ADHD, causing the adult to experience lower educational and occupational achievements. The European adults will also have problems in their daily relationships with families and close friends.