Please consult your physician before starting any medication treatment. Neurontin 400mg 15 Caps Generic Name: gabapentin (ga bah PEN tin) Brand Names: Neurontin What is gabapentin? Gabapentin affects chemicals and nerves in the body that are involved in the cause of seizures and some types of pain. The exact way that it works is unknown. Gabapentin is used with other drugs in the treatment of some types of seizures and for the management of postherpetic neuralgia (nerve pain caused by the herpes virus or shingles). Gabapentin may also be used for purposes other than those listed in this medication guide.