Dopamine is the neurotransmitter with the greatest involvement in ADHD.1
In ADHD, disorders at all dopamine receptors as well as at the dopamine transporter (DAT) have been documented, although these do not necessarily occur together. ADHD symptoms are also reported as a result of encephalitis, which destroys those cells that produce dopamine. As a result, dopamine is not sufficiently present in certain brain areas or is broken down too quickly.
Dopamine is a monoamine, like noradrenaline and adrenaline, whose precursor is dopamine. Dopamine is the most common monoamine in the brain, accounting for 80%.
Franck (2003): Hyperaktivität und Schizophrenie – eine explorative Studie; Dissertation, Seite 66, mit weiteren Nachweisen ↥