Gabapentin is an anticonvulsant medication prescribed for a variety of conditions. Learn about its uses, side effects, and what you should know if you've been prescribed this medication. Gabapentin is a prescription medicine used to treat seizures, pain after shingles, restless legs syndrome, and off-label uses. Learn about side effects, dosage, uses, warnings, interactions, and brand differences. Learn about the side effects of gabapentin, from common to rare, for consumers and healthcare professionals. Gabapentin is a prescription medication taken in pill form that was originally developed to treat seizures and epilepsy, but has since been used for a variety of other conditions, mostly. Gabapentin, sold under the brand name Neurontin among others, is an anticonvulsant medication used to treat neuropathic pain (postherpetic neuralgia) and partial seizures of epilepsy. [12][7] Gabapentin is a central nervous system (CNS) depressant and derivative of the inhibitory neurotransmitter, GABA. [7] It is used for the treatment of neuropathic pain caused by diabetic neuropathy. Gabapentin capsules, tablets, and oral solution are used along with other medications to help control certain types of seizures in people who have epilepsy. Gabapentin capsules, tablets, and oral solution are also used to relieve the pain of postherpetic neuralgia (PHN; the burning, stabbing pain or aches that may last for months or years after an attack of shingles). Gabapentin extended. Gabapentin may cause vision changes, clumsiness, unsteadiness, dizziness, drowsiness, sleepiness, or trouble with thinking. Make sure you know how you react to this medicine before you drive, use machines, or do anything else that could be dangerous if you are not alert, well-coordinated, or able to think or see well. Find patient medical information for Gabapentin (Gralise, Neurontin) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Gabapentin (Neurontin) is a prescription drug. It comes as an oral capsule, an immediate- or extended-release oral tablet, and an oral solution. Gabapentin, available in both branded and generic forms, is used to treat partial seizures, postherpetic neuralgia following shingles and restless legs syndrome.