Dd1 has been medicated for absences for just over 1 year. She had to be medicated due to the dangers - she had automatisms during her absences and would walk into traffic - and she would sometimes wet herself during an absence. She would also not have coped without medication because this was happening with increasing frequency and was very upsetting for her.
She was not behind on her school work before medication (ethosuximide) though most likely would have been if left unmedicated for longer. However, she has made little academic progress since being medicated. She is 1 yr behind in maths, her reading regressed, she suffered from lack of concentration and poor focus, poor working memory, speech impediment... to name a few. The medication stopped the absences as far as we could tell (no more walking ones) so she was safe which was a blessing and that was certainly worth medicating for. I can not say for sure whether the medication caused the bad effects or whether these were due to the underlying epilepsy (sub-clinical activity).
There was only one way to find out...
You are supposed to wait for 2 years of no seizures before weaning off meds. I decided to begin weanin off a few months ago, very very slowly. She has now been completely medicine free for 3 days. I have noticed, as the dosage got less and less, that she became mentally sharper and concentration improved noticably. There have been no absences that I can see.
I second farming4's advice though with caution. The contraindications of a med like ethosuximide include agression. When I spoke to dd1s first neurologist (when discussing behavioural side-effects of meds) I remember her saying that there was no risk unless such conditions were already prevalent. You would have to speak to a neurologist who specialises in childhood epilepsy (not a GP) to discuss options.
I do have to say that if it was my child who was becoming violent and suicidal and if I even suspected that it was linked to school then I would take them out of that school. But I know that is easy for me to say and that circumstances may make that very difficult for you.