Objectives: Adult attention-deficit/hyperactivity disorder (ADHD) is an important mental health problem that needs resolution, especially considering the high rates of ADHD continuation from childhood to adolescence/adulthood and the high prevalence of ADHD in adults. Adults with ADHD have lifelong negative impacts and require close monitoring with long-term follow-up. Hence, the establishment of a Korean practice parameter for adult ADHD is necessary to minimize discontinuation of treatment and enable information sharing among Korean mental health professionals. Methods: The Korean practice parameter was developed using an evidence-based approach consisting of expert consensus survey coupled with literature review. Letter-Number Sequencing. Although pharmacotherapy is recommended as the first-line of treatment for adult ADHD, we recommend that it be followed by a multimodal and multidisciplinary approach including psychoeducation, pharmacotherapy, cognitive behavior therapy and coaching. Conclusion: The Korean practice parameter introduces not only general information for the diagnosis and treatment of adult ADHD on a global scale, but also the process of diagnosis and treatment options tailored to the Korean population.The etiology of ADHD is complex and includes both genetic and environmental factors. However, several studies suggest that the causes of ADHD are largely genetic and the disorder has high heritability [7].
Genetic factorsSeveral studies have shown that ADHD has a strong genetic influence and is inherited across generations [8][9][10][11]. Extensive reports from twin and adoption studies have consistently shown high heritability of approximately 75% for childhood ADHD [12], countering the initial estimates of 30-50% [13-15]. These differences might be due to rater effects, which when controlled for, reduced the incompatibility between childhood and adult ADHD [16].