I tried 600mg of DXM (it was my 3rd time doing that much and I thought I could control myself.. whew was I wrong) when I went to school. It was pretty nuts, I have to say. I enjoyed myself a lot, but I didn't really get anything done at school, because I would just stare at a piece of paper and my pen and get really confused, and what the teacher was saying made no sense to me. I mostly just sat in the back and listened to music and closed my eyes.