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). Pictures of Neurontin (Gabapentin), drug imprint information, side effects for the patient. Anonymous said. I just left my neurologist's office 1 hour ago and he wouldn't even listen to me about the increasingly worse pain I have that is caused by my syrinx. NEURONTIN® Capsules, for Oral Use. NEURONTIN® (gabapentin) Tablets, for Oral Use. NEURONTIN® (gabapentin) Oral Solution. DESCRIPTION. The active ingredient in NEURONTIN capsules, tablets, and oral solution is gabapentin,which has the chemical name 1-(aminomethyl)cyclohexaneacetic acid. In December 1993, the FDA approved the drug as an anticonvulsant for adults only. In 2000, this was extended to children. It received approval for the treatment of neuropathic pain caused by shingles in 2004. I have problems with major depression as well as anxiety and panic disorder. I take Effexor for the depression, and Neurontin and Klonopin for the anxiety. 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 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. Epilepsy. Neurontin is indicated as adjunctive therapy in the treatment of partial seizures with and without secondary generalization in adults and children aged 6 years and above (see section 5.1). 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.