hi manish !!
alcohol intake actually depends upon the epiliptic condition, if the seizures episode is on a regular basis, then avoiding alcohol is the best .. but if the episodes are once in a while, you can take a restricted amount of alcohol. amount varies from person to person. for a person on anti epiliptic drug, the sedative effect of these drugs gets worse, you ll feel drunk sooner,u can feel drowsy, get a bad headache, even slurred speech,. if such person misses his dose of drug on the day he takes alcohol, the chances of getting a seizure increases. hence no matter what the medication must not be missed.
if you are not on a medication, stick to only 1 unit (1 peg / 30 ml ) , that to in 7-10 days .. some people can even tolerate 2 .. but thats not good on the long run, it might increase the epileptic episodes.