Does alcohol affect seizures?

Yes. Using alcohol with a history of seizures will and can lower thresholds for seizures to occur and thus increase the likelihood of increasing the incidence of seizures. One should be extremely careful about imbibing in alcohol if one has a seizure history.
Can cause seizures. Alcohol can cause withdrawl seizures, and may effect the seizure threshhold in the brain for other types of xeizure. It may also interact badly with seizure medications.