If you have no insurance, find out who makes your drug through your pharmacist and look online if they offer a PA program based on income qualifying .Fill out the necessary paperwork with Dr.s script and send it in.
Where I live , my state provides a yearly insurance called MA ( medical assistance ) . You may want to get a hold of your County Gov. Offices or maybe you could get a hold of the Epilepsy Foundation. They might be able to help too.