Biochem/physiol Actions Irreversible GABA transaminase inhibitor. Increases intracellular concentration of GABA in nerve endings; possesses antiepileptic activity. Other Notes Tandem Mass Spectrometry data independently generated by Scripps Center for Metabolomics is available to view or download in PDF. V8261.pdf Tested metabolites are featured on Scripps Center for Metabolomics METLIN Metabolite Database. To learn more, visit sigma.com/metlin.