Overview: Gabapentin is used to treat certain people with seizures or nerve pain. Common side effects may include dizziness, sleepiness, or trouble with balance or coordination. Serious side. In clinical studies, efficacy was demonstrated over a range of doses from 1,800 mg/day to 3,600 mg/day with comparable effects across the dose range; however, in these clinical studies, the additional benefit of using doses greater than 1,800 mg/day was not demonstrated. NHS medicines information on dosage for gabapentin, how to take it and what to do if you miss a dose or take too much. Gabapentin 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. Gabapentin is available in 100 mg, 300 mg, and 400 mg capsules, and in 600 mg and 800 mg tablets. The dose of gabapentin to treat epilepsy with partial onset seizures in patients 12 years of age and older is up to 600 mg three times daily. Gabapentin is used to help control partial seizures (convulsions) in the treatment of epilepsy. This medicine cannot cure epilepsy and will only work to control seizures for as long as you continue to take it. Gabapentin belongs to a class of drugs known as anti-seizure drugs. Take gabapentin by mouth as directed by your doctor, usually once a day with the evening meal. The dosage is based on your medical condition and response to treatment. Swallow gabapentin whole. Do not crush or chew sustained-release tablets. 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. Detailed Gabapentin dosage information for adults and children. Includes dosages for Restless Legs Syndrome, Epilepsy and Postherpetic Neuralgia; plus renal, liver and dialysis adjustments. Gabapentin is approved to prevent and control partial seizures, relieve postherpetic neuralgia after shingles and moderate-to-severe restless legs syndrome. Learn what side effects to watch for, drugs to avoid while taking gabapentin, how to take gabapentin and other important questions and answers.