Postherpetic neuralgia (PHN) is a painful condition which is difficult to treat, especially among the elderly. This clinical case describes the treatment of an 88-year-old patient with PHN who continued to suffer from pain for several months despite oral and transdermal pain treatment. Multiple intradermal glucose 5% injections allowed her to discontinue her pain medication regimen after four sessions. The improvement was sustained at the four-month follow-up after the last procedure. A fifth session was performed because of a flaring up of the pain.