Tiagabine hydrochloride is a potent and selective GABA reuptake inhibitor, used as an anticonvulsant agent, with IC50s of 67, 446 and 182 nM for [3H]GABA uptake in Synaptosomes, Neurons and Glia, respectively[1].
References:
[1]. Braestrup C, et al. (R)-N-[4,4-bis(3-methyl-2-thienyl)but-3-en-1-yl]nipecotic acid binds with high affinity to the brain gamma-aminobutyric acid uptake carrier. J Neurochem. 1990 Feb;54(2):639-47.
[2]. Sheehan, D.V., et al., An open-label study of tiagabine in panic disorder. Psychopharmacol Bull, 2007. 40(3): p. 32-40.
[3]. Henjum, S. and B. Hassel, High-affinity GABA uptake and GABA-metabolizing enzymes in pig forebrain white matter: a quantitative study. Neurochem Int, 2007. 50(2): p. 365-70.