Our son, age eight, is on Keppra now for the 2nd time.
He was on it first from age 18 months to two years old. At that time he was having infrequent tonic-clonic (grand mal) seizures -- maybe once a month or so -- and the Keppra didn't seem to make any difference, so he was weaned off after about 6 months and put on Topamax (which did really work for 3 1/2 years).
Then the Topamax stopped working, and he went through one drug after another, and now we're back to Keppra (he's also on Zonegran, and almost weaned off Diazepam).
This time, it seems that the Keppra is helping with daytime photosensitive seizures (tonic) -- he's still having them, but not as much -- maybe 50% reduced.
The one significant side effect (and I think this affects kids more) is that he gets into these super-hyperactive frenzies -- it's not a rage -- in fact, it starts when he's really happy and excited - like, we'll be playing a game or something -- and then he goes into this hyper hyper state -- almost like a seizure in and of itself -- a little scary. We did notice though that when we started to reduce the Diazepam, that the hyperness from the Keppra eased up -- maybe the two drugs were interacting somehow.
The other side effect is that he's quite mean -- hurting people -- pinching, scratching, and hitting -- he's not mad -- he just will do something like be cuddling on the sofa with you, and all of a sudden -- bam!! He hauls off and just slaps really hard. He runs up to total strangers and pinches them or hits them. It's quite embarrassing, and he seems totally unable to control himself.
Along with the hyperactivity and aggression, there's a lack of self-control and some destructive behavior.
so...yes, it does seem to help with the seizures, but making it hard to live with the little guy.