I am prescribed 50mg once a day, but I was in a really dark place last night, and stupidly, I took 400mg. I began overdosing late at night and continued through out the early morning. I haven't slept a wink. I'm having chills, shaking.. similar to how I feel before I have a panic attack. However it's been multiple hours and I haven't experienced any more symptoms. I think I'm fine, but I can't be sure.