Interactions between central monoaminergic systems: dopamine-serotonin.

Abstract
Concentration of dopamine and serotonin metabolites (HVA [homovanillic acid] and 5-HIAA hydroxyindoleacetic acid) in the CSF was evaluated before and after pharmacological treatment in 19 patients with different neuropsychiatric diseases. In every case a reciprocal modification of the 2 metabolites occurred after treatment. The hypothesis of a functional balance between the monoaminergic systems in the CNS is supported.