XenoPort, Inc. is a biopharmaceutical company. The Company is focused on commercializing HORIZANT (gabapentin enacarbil) Extended-Release Tablets in the United States. The Company's segment is the development and commercialization of product candidates for the treatment of neurological and other disorders. Its development-stage product candidates include XP23829, XP21279 and arbaclofen placarbil. HORIZANT has been approved by the United States Food and Drug Administration for the treatment of moderate-to-severe primary restless legs syndrome in adults and for the management of postherpetic neuralgia in adults. XP23829 is a fumaric acid ester compound and a prodrug of metabolite monomethyl fumarate being developed for the treatment for patients with moderate-to-severe chronic plaque-type psoriasis and/or patients with relapsing forms of multiple sclerosis. XP21279 is a Transported Prodrug of levodopa being developed for the treatment for patients with idiopathic Parkinson's disease.