HI and welcome Jo! I am so sorry your little boy is going through this! Try not to be discouraged about the medicine just yet. It can take awhile to see what dose might work for him or if he needs additional medication. My son also has simple and complex partials, sometimes generalizing.
It is difficult to see medications NOT work immediately, I know! Hang in there. It usually takes at least 4-6 weeks just to see if side effects can be tolerated and if there is any control. The doctor may ask for blood work to see what the level of medication is in his blood. Because different people can metabolize at there own rate, he might do better at a higher dose.
DO you call the neuro when he has seizures? Our first neuro had me do this early on. Then he would adjust meds accordingly.
I also found that keeping a journal of seizures helped see if there was any pattern to them. Like certain things that might trigger them and we could try to avoid these.....(ie too little sleep, stress, missing a meal, flashing lights, illness etc)...........
Hang in there. YOu have found some support and info here. I have a son who has had seizures since he was very young, is now on Zonegran for his partial epilepsy. My daughter also had seizures for a time. Both of them are teens.