<prompt> What is the mechanism of action of levetiracetam?Antagonist of GABAA receptorBind to synaptic vesicular protein SV2AInhibit voltage gated Ca channelInhibit Na channel  <response>: Levetiracetam is an anti-epileptic drug that works by binding to SV2A, a ubiquitous synaptic vesicle integral membrane protein, which functions as a positive effector of synaptic vesicle exocytosis. Binding to SV2A in the vesicle reduces the release of the excitatory neurotransmitter glutamate. It is used for treatment of focal seizures GTCS, JME 