I am allergic to it. (my rash is seen in my photos if you need it). For me, the
side effects are worse than TN itself for me, but others have said it's life changing. Other people have listed Trileptal (Oxcarbazepine), Neurontin (Gabepentin), Elavil (Amitriptyline) and Lyrica (Pregabalin) as some alternatives.
I am currently on Lyrica + Cymbalta. I can't say that it's working but still playing with dosages.