ADHD is a psychiatric disorder in children. As the name suggests, children with this syndrome cannot pay enough attention to anything and are usually overly active in everyday matters. Another important cause of ADHD may be brain anatomy, its structure and function. Children with ADHD have been found to have reduced activity levels in certain brain regions. Some serious head injuries can also cause this condition to appear in children. If this disease is not treated in time, the symptoms of this disease may become more complicated. You can buy modalert 200mg tablets from online pharmacy to reduce the symptoms associated with this disorder.