GuidelinesSociety for Developmental and Behavioral Pediatrics Clinical Practice Guideline for the Assessment and Treatment of Children and Adolescents with Complex Attention-Deficit/Hyperactivity DisorderBarbaresi, William J. MD (Guideline Panel Chair)*; Campbell, Lisa MD†; Diekroger, Elizabeth A. MD‡; Froehlich, Tanya E. MD§; Liu, Yi Hui MD, MPH‖; O'Malley, Eva¶; Pelham, William E. Jr PhD, ABPP**; Power, Thomas J. PhD, ABPP††; Zinner, Samuel H. MD‡‡; Chan, Eugenia MD, MPH*Author Information *Division of Developmental Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA; †Division of Developmental and Behavioral Sciences, Children's Mercy College Boulevard Clinics, UMKC School of Medicine, Kansas City, MO; ‡Division of Developmental-Behavioral Pediatrics and Psychology, UH Rainbow Babies and Children's Hospital, Case Western Reserve University School of Medicine, Cleveland, OH; §Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH; ‖Division of Academic General Pediatrics, Child Development and Community Health, University of California, San Diego, San Diego, CA; ¶TRI CHADD NJ, Howell, NJ; **Center for Children and Families, Florida International University, Miami, FL; ††Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA; ‡‡Department of Pediatrics, University of Washington, Seattle, Seattle, WA. Address for reprints: William J. Barbaresi, MD, Division of Developmental Medicine, Boston Children's Hospital, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115; e-mail: email@example.com Disclosure: T. J. Power: Royalties from Guilford Publishers for the ADHD Rating Scale-IV and ADHD Rating Scale-V. The remaining authors declare no conflict of interest. Journal of Developmental & Behavioral Pediatrics: February/March 2020 - Volume 41 - Issue - p S35-S57 doi: 10.1097/DBP.0000000000000770 Buy Metrics Abstract Attention-deficit/hyperactivity disorder (ADHD) is the most common childhood neurodevelopmental disorder and is associated with an array of coexisting conditions that complicate diagnostic assessment and treatment. ADHD and its coexisting conditions may impact function across multiple settings (home, school, peers, community), placing the affected child or adolescent at risk for adverse health and psychosocial outcomes in adulthood. Current practice guidelines focus on the treatment of ADHD in the primary care setting. The Society for Developmental and Behavioral Pediatrics has developed this practice guideline to facilitate integrated, interprofessional assessment and treatment of children and adolescents with “complex ADHD” defined by age (<4 years or presentation at age >12 years), presence of coexisting conditions, moderate to severe functional impairment, diagnostic uncertainty, or inadequate response to treatment. Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.