trigeminal neuralgia
"Diagnosed after an auto accident and air bags smashed me in the face and broke my glasses.  Pain of the trigeminal neuralgia was 3 to 5 minutes each time it hit and was as everyone on here describes , indescribable. 
This drug worked but I continually had to keep increasing the dose from 200mg to 600mg and on occasion 800 to 900 on bad days. 
Have found great success with this drug combined with an acupuncture regimen, this combo has stopped the continued progression/escalation of pain and has me living on about 600 mg daily sometimes as low as 400mg. The reduction has helped with drowsiness and I am not quite as scared regarding the continual progression/elevation of pain and meds. Just hope it lasts,  every bit of reprieve you can get counts for a lot. GOOD LUCK ALL"