为何不服用keppra？keppra 抑制钙离子进入神经细胞，抑制兴奋。Mg 拮抗，作用类似。

Mechanism of action[edit]

The exact mechanism by which levetiracetam acts to treat epilepsy is unknown. Levetiracetam does not exhibit pharmacologic actions similar to that of classical anticonvulsants. It does not inhibit voltage-dependent Na+ channels, does not affect GABAergic transmission, and does not bind to GABAergic or glutamatergic receptors.^[30] However, the drug binds to SV2A,^[31] a synaptic vesicle glycoprotein, and inhibits presynaptic calcium channels,^[32] reducing neurotransmitter release and acting as a neuromodulator. This is believed to impede impulse conduction across synapses.^[33]

^引自wiki