Levetiracetam Levetiracetam is probably a major breakthrough in the treatment of epilepsies. It is a highly effective, broad-spectrum, one of second generation AED with a unique mechanism of action. Chemical structure: Levetiracetam is a single enantiomer, (S)-α-ethyl-2-oxo-pyrrolidine acetamide. Its molecular formula is C8H14N2O2 and its molecular weight is 170.21. It is chemically unrelated to any of the other antiepileptic drugs. It is a white to off-white powder with a faint odor and bitter