I have a 5 year old son who was recently diagnosed with childhood abscence epilepsy, he was prescribed epilim which seemed to work to start with but then within about 6 weeks his dose had been increased to maximum dose, when he started having seizures again he was then prescribed zontarin, which worked for a few weeks but then weve had to increase his dose, we have another few more weeks of oppurtunity to increase dose.Why is it the increase in dose works for a couple of weeks and then the seizures start again?