Double-blind, multi-center, placebo-controlled, 2-period crossover study which assessed the efficacy and safety of gabapentin enacarbil (GEn; GSK1838262; XP13512) extended release tablets in adults with Restless Legs Syndrome (RLS)-associated sleep disturbance. One hundred thirty-six (136) adult subjects with RLS-associated sleep disturbance and periodic limb movements (PLM) were randomized from 23 centers in the United States. Subjects who met all eligibility criteria were randomized to receive a treatment sequence of GEn:placebo or placebo:GEn. Investigational product was taken with food at approximately 5pm. Investigational product was dosed as 600mg/day x3 days followed by 1200mg/day x25 days for each 4-week treatment period. There was a 1-week taper at 600mg after each treatment period followed by a 1-week washout between treatments. Polysomnography (PSG) was used to objectively evaluate changes in sleep and PLMs.
