Brand Name :Neurontin / Gabasign, Generic Name: Gabapentin 800 mg, Drug Class: Muscle Relaxant, Pain Relief, Gabapentin is a medicine used to treat partial seizures, nerve pain from shingles and restless leg syndrome. It works on the chemical messengers in your brain and nerves. Gabapentin is used to treat epilepsy. Gabapentin is from a group of medicines called anticonvulsants.