Gabapentin is a prescription medicine used to treat Nerve pain, RLS. It is available in different variants: Gabapentin 100 mg, 300 mg, 400 mg, 600 mg, 800 mg, 1200 mg, 1600 mg. It works by calming down the overexcited nerve signals in the brain. People with conditions like neuropathy or certain types of seizures find relief from their symptoms with gabapentin.