In pharmacology, a GABA transaminase inhibitor is an enzyme inhibitor that acts upon GABA transaminase.[1] Inhibition of GABA transaminase enzymes reduces the degradation of GABA, leading to increased neuronal GABA concentrations.

Examples include valproic acid,[2] vigabatrin,[3][4] phenylethylidenehydrazine (and drugs that metabolize to it, such as phenelzine[5]), ethanolamine-O-sulfate (EOS), and L-cycloserine.[6]

Certain members of this class are used as anticonvulsants.


  1. ^ Ciesielski, L.; Simler, S.; Gensburger, C.; Mandel, P.; Taillandier, G.; Benoit-Guyod, J. L.; Boucherle, A.; Cohen-Addad, C.; Lajzerowicz, J. (1979). "GABA Transaminase Inhibitors". GABA—Biochemistry and CNS Functions. Advances in Experimental Medicine and Biology. Vol. 123. pp. 21–41. doi:10.1007/978-1-4899-5199-1_2. ISBN 978-1-4899-5201-1. PMID 390993.
  2. ^ Bruni, J.; Wilder, B. J. (1979). "Valproic acid. Review of a new antiepileptic drug". Archives of Neurology. 36 (7): 393–398. doi:10.1001/archneur.1979.00500430023002. PMID 110294.
  3. ^ Wang QP, Jammoul F, Duboc A, et al. (April 2008). "Treatment of epilepsy: the GABA-transaminase inhibitor, vigabatrin, induces neuronal plasticity in the mouse retina". Eur. J. Neurosci. 27 (8): 2177–87. doi:10.1111/j.1460-9568.2008.06175.x. PMC 2933832. PMID 18412635.
  4. ^ Gibson, J. P.; Yarrington, J. T.; Loudy, D. E.; Gerbig, C. G.; Hurst, G. H.; Newberne, J. W. (1990). "Chronic toxicity studies with vigabatrin, a GABA-transaminase inhibitor". Toxicologic Pathology. 18 (2): 225–238. doi:10.1177/019262339001800201. PMID 2399411.
  5. ^ McKenna, K. F.; McManus, D. J.; Baker, G. B.; Coutts, R. T. (1994). "Chronic administration of the antidepressant phenelzine and its N-acetyl analogue: effects on GABAergic function". Journal of Neural Transmission. Supplementum. 41: 115–122. doi:10.1007/978-3-7091-9324-2_15. ISBN 978-3-211-82521-1. ISSN 0303-6995. PMID 7931216.
  6. ^ Polc, P.; Pieri, L.; Bonetti, E. P.; Scherschlicht, R.; Moehler, H.; Kettler, R.; Burkard, W.; Haefely, W. (1986). "L-cycloserine: Behavioural and biochemical effects after single and repeated administration to mice, rats and cats". Neuropharmacology. 25 (4): 411–418. doi:10.1016/0028-3908(86)90236-4. PMID 3012401. S2CID 462885.