The National Institutes of Health's National Institute on Drug Abuse (NIDA) has awarded $3.7 million to Indiana University researchers to investigate the complex relationship between ADHD medications and serious substance use problems among vulnerable youth and young adults. The study aims to fill critical gaps in understanding how ADHD medications impact the risk of serious substance use problems by analyzing nationwide healthcare data of over 3.3 million young people (ages 9-29) enrolled in Medicaid who received an ADHD diagnosis.