Dopamine (DA) regulates motor control, motivation, learning and memory, cognition, and social behavior, and its dysregulation underlies a wide range of neurological and psychiatric disorders. In Parkinson’s disease (PD), degeneration of dopaminergic neurons in the substantia nigra depletes striatal DA, making dopaminergic restoration a central therapeutic target. Because DA does not cross the blood-brain barrier (BBB), treatment relies on its precursor L-DOPA. Intranasal (IN) administration…
