trigeminal neuralgia
"I have trigeminal neuralgia with debilitating shock pain running from my upper gum/lip line up across my face into my eye socket. Carbamazepine was prescribed. After increasing the dosage incrementally, 800 mg a day (500 in the a.m. and 300 in the p.m.) it  controls most of my pain. I still have touch sensitivity issues if I run my tongue over my lip too hard it sets off shocks. One thing you need to note: you may have to play around with the dosage and time of day you take it to control your pain. The first suggestion by my neurologist (100mg three times a day) didn't even touch the pain. It was only after I kept insisting that it wasn't working, he turned me loose to trial and error, on my own with an upper limit of 1000mg per day."