An anti-epileptic drug that inhibits the synaptosomal uptake of GABA, increasing the activation of GABAA receptors; inhibits CYP3A4, CYP1A2, and CYP2C19; inhibits LDH, blocking both lactate-to-pyruvate and pyruvate-to-lactate conversions by human LDH isoforms 1 and 5 at 500 µM.