I've had JME since I was 14. I drank with my meds one night when I was 16 and I kept blacking out, like dropping as i walk into unconciousness and basicly passing out, my bf took care of me and thankfully nothing major came of it. I never drank with Valproic Acid again. I drank before and after that, but made sure to take my Valproate at least 2hrs from the drinking session, and I would be fine...well as fine as you can be when drinking. I'm now 23 and on Keppra. I've been taking it for 3+ months now. I drank the other night and felt fine (2 5% drinks) then became violently ill the next morning, throwing up every 10 minutes, maybe it was the stomach flu, maybe a bad mix of drugs. Either way I can definitely say that Keppra does have some form of negative affect when mixed with alcohol, valproate i was okay, as long as i didn't wash down my pills with vodka lol. Hope this is of some help.
Drink safe and best of luck