Well, just to remind you this is only one opinion. I was on 600 mg of tegratol and my doc also wanted to switch to zonegram. He did basically because tegratol wasn't working anymore. To give you the scientific part of it, zonegram has less side effects than tegratol. To give you my input, it didn't work. In fact symptoms got worse. These included: headache, nausea, forgetfulness, and sleepleness. I just beg you to remember, i'm only one voice. And good luck!