postherpetic neuralgia
"My GP prescribed Neurontin to treat pain from PHN, increasing to 1800mg per day. After 6 weeks I find it does reduce pain to some extent and I am able to get a reasonable sleep. Side effects include ringing in ears and tingling in feet and hands, but I can put up with this.
 I was previously taking Lyrica but experienced very nasty side effects and had  to be weaned off it."