Attention deficit hyperactivity disorder (ADHD) has long been a contentious and polarising issue in mental health care. Mental health nurses are regularly responsible for the care, treatment and care coordination of individuals with a diagnosis of ADHD. This means that mental health nurses are in one of the best positions to have a positive impact on the lives of people with ADHD. This article aims to be a refresher to mental health nurses of the lifetime health outcomes and risks associated with ADHD. This article discusses a multitude of factors, such as increased rates of substance abuse and addiction, higher instances of self-harm and suicide, reduced life expectancy, increased driving risk, poorer educational outcomes, and reduced professional outcomes. The role of the mental health nurse is central in supporting service users to seek appropriate, evidence-based treatment. Improving mental health nurses' understanding and information will enable practitioners to make informed decisions regarding the care and treatment of service users. To read the full article, log in using your NHS OpenAthens details.