Update on attention deficit hyperactivity disorder.

Attention deficit hyperactivity disorder (ADHD) is now the most frequent diagnosis in children seen by Australian general paediatricians. It is a heterogeneous neurodevelopmental disorder and is usually accompanied by one or more co-morbid developmental and/or mental health conditions. In addition to daily symptoms, which often impair quality of life, ADHD can compromise educational and social development for the individual, and impact on families, schools and the broader community. Draft revised National Health and Medical Research Council Guidelines on ADHD were published in November 2009. This comprehensive document discusses the evidence in relation to many aspects of ADHD, which inform the large number of practice recommendations. Although there is an enormous literature on the causes, neurobiology and management of ADHD, there is still much to be learned particularly in relation to early intervention, behavioural therapies and factors influencing long-term outcomes.