A GABA transaminase inhibitor is an enzyme inhibitor that acts upon GABA transaminase.
Examples include valproic acid,vigabatrin,phenylethylidenehydrazine, ethanolamine-O-sulfate (EOS), and L-cycloserine.
Certain members of this class are used as anticonvulsants.
There is some evidence that Melissa officinalis (lemon balm), and the rosmarinic acid it contains, inhibits GABA transaminase.