I have been on Cymbalta for 3years prior to being diagnosed with TN. I have quite a few other health issues but was put on cymbalta mainly for anxiet. The only side effect that I had when I started it was that it would keep me awake so I make sure I take it in the morning. My sister has the opposite it makes her tired so she take it at night. This is a drug that take 3-6 weeks before you will get optimal results. I have not heard of it being used to treat TN. I can not tolerate any of the antiseizure meds so I am consdering other options like the balloon compression. Good luck Hope you get some relief