question: my son is 10 years old. he is having epelipesy problem from 7 years . now, he is getting 500 walparin chrono two time, keppra 500 two times and frisum 30 ( 10 morn & .20 night) his weight increased 15 kgs in six months now his wieight is 47 kgs. but problem is still thier. pleae give side effects of tablets.