Health and Fitness FDA Approves Horizant to Treat Restless Legs Syndrome by Gary Kopycinski on April 7, 2011 Gary Kopycinski Author More in Health and Fitness: On Hantavirus, Park Forest Officials Urge Caution May 18, 2026 Rep. Kelly Condemns FDA Approval of Flavored E-Cigarettes May 6, 2026 Park Forest Aligns With Illinois Guidance on Childhood Vaccines Amid Federal Changes January 11, 2026 Silver Spring, Maryland–(ENEWSPF)–April 7, 2011. On April 6, the U.S. Food and Drug Administration approved Horizant Extended Release Tablets (gabapentin enacarbil), a once-daily treatment for moderate-to-severe restless legs syndrome (RLS).