My neurologist ruled out a lot of potential meds due to drug allergies and sensitivities. For the 3 short weeks I was on carbamazepine I developed an itching allergy that ruled any drug similar to it. I am also sensitive to Neurontin (Gabapentin), allergic to Lamictal, and allergic to Mirapex. I believe the only drug left after my current Amitriptyline is Depacote. The only side effect I had with it was weight gain, but I have not yet tried it for TN. Right now I am ramping up on Amytriptyline. Carbamazepine worked pretty well and I was sad to see it added to my long list of allergies. I only made it up to 600 mg before I had to ramp down.