If you can, see if your prescriber will up your doses and you can cut your pills in half. Tell them why so they know you are dealing with the issue of the shortages. You will still have a decent supply at refill time. Keep on using the oldest first, rotate your spares.
We are talking meds for specific applications for you epilepsy here, not "pain pills" or mood altering psychiatric meds. Messing with those is playing with fire.
Unless you are a congress critters.