My son experienced a bad reaction to depakote when we tried a dose that was a little too high for him. He still takes it at a lower dose and does fine with it. I'm not sure that it made him hallucinate but it might have- I only noticed that he looked and sounded (talked) like someone getting ready to go on a killing spree or something- for real, he wasn't raging, he was perfectly calm but did not look or talk "normal".