SYNGAP1 and epilepsy: Among them, three patients achieved seizure freedom after combination therapy with levetiracetam, and two patients with drug-resistant epilepsy achieved seizure control after the addition of clobazam.<h4>Conclusions</h4>Myoclonic seizures, absence seizures, and eyelid myoclonia are common in <i>SYNGAP1</i>-related epilepsy.