Gabapentin 100 mg is used to prevent and control partial seizures. Gabapentin can be used in adults and children aged 3 and older who have partial seizures. Relieve nerve pain following shingles in adults. Gabapentin is approved to treat the type of nerve pain (neuralgia) that results from nerve damage. Gabapentin is used to treat neuralgia caused by a herpes zoster viral infection, also known as shingles. This pain is called post-herpetic neuralgia (PHN), and it can be severe and chronic