It also activates glutamate decarboxylase, an enzyme that is needed in GABA synthesis. This is thought to be the primary mechanism of action behind its anticonvulsant action.[1]
References
^Silverman RB, Andruszkiewicz R, Nanavati SM, Taylor CP, Vartanian MG (July 1991). "3-Alkyl-4-aminobutyric acids: the first class of anticonvulsant agents that activates L-glutamic acid decarboxylase". Journal of Medicinal Chemistry. 34 (7): 2295–2298. doi:10.1021/jm00111a053. PMID2067001.