Another option is to take the same doseage that you would daily but break it into smaller amounts more often. So instead of taking 800mg and taking 2 doses of 400mg, try taking 4 doses of 200 mg.

Often you can avoid the highs and lows that way and keep a more consistent amount of medication in your system, so one you get better pain coverage and two you have less medication rush, Tegretol is I think the best drug for TN but I could not deal with the side effects and changed to Neurontin and Lyrica for many years. Funny enough now I do take 200mg at night, so I sleep off the problems and still get the benefits,,,

Good luck, hope it all works out for you.