Gabapentin capsules, tablets, and oral solution are used 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). Neurontin is an anti-epileptic medication used to treat seizures. Neurontin is used alone or in combination with other medications to treat seizures caused by epilepsy in adults and children who are at least 12 years old. The likelihood of Neurontin or gabapentin abuse to occur is considered low due to its low addictive potential. It does however produce withdrawal symptoms, which is an important aspect of physical addiction. For the Consumer. Applies to gabapentin: oral capsule, oral solution, oral suspension, oral tablet. Along with its needed effects, gabapentin (the active ingredient contained in Neurontin) may cause some unwanted effects. Gabapentin is a prescription drug, marketed as Neurontin and Horizant, that's used to treat epilepsy. Doctors can prescribe gabapentin to treat epilepsy in people older than 12, and partial. 2.1 Dosage for Postherpetic Neuralgia. In adults with postherpetic neuralgia, NEURONTIN may be initiated on Day 1 as a single 300 mg dose, on Day 2 as 600 mg/day (300 mg two times a day), and on Day 3 as 900 mg/day (300 mg three times a day). Gabapentin (Neurontin, Gralise, and others) is a prescription drug used to treat seizure disorders and nerve damage from shingles. Off label uses (non-FDA approved) include fibromyalgia, headaches, and hot flashes. Common side effects are fatigue, nausea, hostility, dizziness, and tremors. Learn about Neurontin (Gabapentin) may treat, uses, dosage, side effects, drug interactions, warnings, patient labeling, reviews, and related medications. Gabapentin (Neurontin) is an anticonvulsant medication in the GABA analog lass that was originally created to help manage epilepsy, but is also utilized to help individuals suffering from neuropathic pain. Neurontin ® is indicated for: Management of postherpetic neuralgia in adults; Adjunctive therapy in the treatment of partial onset seizures, with and without secondary generalization, in adults and pediatric patients 3 years and older with epilepsy.