Gabapentin capsules, pills, and oral solution are used in conjunction with other drugs to assist persons with epilepsy manage some kinds of seizures. Postherpetic neuralgia is also treated with gabapentin gabantin 300mg tablets, pills, and an oral solution. Restless legs syndrome is treated with gabapentin extended-release tablets (Horizant). Gabapentin belongs to the anti-convulsant family of drugs. Gabapentin cures seizures by reducing aberrant brain excitation. Gabapentin gabantin 100mg improves PHN discomfort by altering how the body perceives pain. The specific mechanism of action of gabapentin in the treatment of restless legs syndrome is unclear.