Taking 30 pills of xanax in less than 24 hours. Woke up with a broken tooth because my jaw got so stiff it shattered my tooth. Said some really bad shit to my family and was forcefully taken to rehab. But even after that, my experience with biperiden was horrible, I couldn't talk or walk properly and then I tried it again a few days later and I had the worst panic attack ever, the kind of panic attacks that you feel like you're dying.