I used to take it as an adjunct for treating a mental health condition--and while there were some side effects for me, it wasn't bothersome enough to make me stop taking it. Among the side effects I had (which, you may not, or you may experience different ones): I got a little bit of tingling in my hands/feet, felt a little sleepy, it made bright objects against a dark background have a "trail" behind them when I was tired (I was able to mitigate some of this by taking my entire dose in the morning instead of every 12 hours, so if you get that, ask if your doctor thinks that's OK), and it made soda/anything carbonated taste terrible, but we're not really supposed to drink that anymore, either!