List of products in the National Drug Code with proprietary name . This medication is used to treat moderate to severe restless legs syndrome. It is also used to relieve nerve pain following shingles (a painful rash due to herpes zoster infection). This condition is called postherpetic neuralgia. Gabapentin enacarbil is changed by your body to gabapentin. Gabapentin belongs to a class of drugs known as anti-seizure or anticonvulsant drugs.