Dose-Response and Pharmacokinetics of Gabapentin Enacarbil (GEn [XP13512 / GSK1838262]) in Restless Legs Syndrome

Double-Blind Treatment Phase: 600 mg GEn (XP13512) orally, once daily for 3 days followed by 600 or 1200 mg on days 4-6, followed by 600 or 1200 or 1800 mg on days 7-9, followed by 600 or 1200 or 1800 or 2400 mg on days 10-84. Double-Blind Taper Phase: 600 or 1200 or 1800 mg GEn (XP13512) orally, once daily on days 85-86, followed by 600 mg or 1200 mg on days 87-88, followed by 600 mg on days 89-91

Placebo orally once daily