trigeminal neuralgia
"Been taking for 10 years. Just had a bad 3 months and it took 1600mg for 3 weeks to control it. Now back to 1200mg and am reducing 100mg every 2 weeks. I was down to 600mg prior to this. A very heavy cold set it off this time. For some strange reason, 1 x400mg tablet is far more effective than 4x100mg tablets. I am in UK so no insurance and little cost."