Gabapentin is a prescription medication used to treat nerve pain (neuropathic pain) and seizures. It is an anticonvulsant that works by stabilizing electrical activity in the brain and affecting the way the nerves send messages to the brain. Gabapentin is commonly used for conditions such as epilepsy, postherpetic neuralgia (pain following shingles), and diabetic neuropathy. It is important to follow the dosage instructions provided by a healthcare provider.