Vinconate, even when systemically administered, enhances the endogenous release of dopamine in the striatum, probably via the stimulation of presynaptic muscarinic receptors.[2]
^Iino T, Katsura M, Kuriyama K. Effect of vinconate on the extracellular levels of dopamine and its metabolites in the rat striatum: microdialysis studies. Eur J Pharmacol. 1995 Nov 3;286(1):99-103. doi: 10.1016/0014-2999(95)00545-v. PMID: 8566157.