I took it for years, starting on about 200 and at one point taking 800mg. I eventually had to stop it because it gave me very low blood pressure and very high heart rate. It did help, a lot, with anxiety. It was initially prescribed for insomnia, related to bipolar 1. I found I needed to take it about 20 minutes before sleep time, and be ready and in bed on time, because it usually knocked me out like a hammer. Sometimes it didn't work at all, but nothing would anyway. You might feel hungover the first several days, and that's normal until your body gets used to it.