gabantin 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 gabantin capsules, pills, and an oral solution. Restless legs syndrome is treated with gabantin 300 extended-release tablets (Horizant). The gabantin 100 belongs to the anticonvulsant family of drugs. gabantin cures seizures by reducing aberrant brain excitation. gabantin improves PHN pain by altering how the body perceives pain. The mechanism of action of gabantin in the treatment of restless legs syndrome remains unknown.