• SKIP TO CONTENT
  • SKIP NAVIGATION
  • Patient Resources
    • COVID-19 Patient Resource Center
    • Clinical Trials
    • Search Clinical Trials
    • Patient Notification System
    • What is Clinical Research?
    • Volunteering for a Clinical Trial
    • Understanding Informed Consent
    • Useful Resources
    • FDA Approved Drugs
  • Professional Resources
    • Research Center Profiles
    • Clinical Trial Listings
    • Market Research
    • FDA Approved Drugs
    • Training Guides
    • Books
    • eLearning
    • Events
    • Newsletters
    • JobWatch
    • White Papers
    • SOPs
    • eCFR and Guidances
  • White Papers
  • Trial Listings
  • Advertise
  • COVID-19
  • iConnect
  • Sign In
  • Create Account
  • Sign Out
  • My Account
Home » RLS Drug Shows Promise in Pivotal Trial

RLS Drug Shows Promise in Pivotal Trial

March 11, 2008
CenterWatch Staff

XenoPort and GlaxoSmithKline reported positive top-line results from a phase III trial of XP13512, a gabapentin pro-drug with enhanced absorption, for the treatment of moderate to severe restless legs syndrome. This 12-week, double-blind, placebo-controlled study, dubbed XP053, enrolled 325 subjects. The endpoints were met with statistical significance in both dose groups when compared to placebo.

The subjects received placebo or 600 mg or1, 200 mg of XP13512, given once per day. The primary endpoints were the change from baseline for the International Restless Legs Syndrome (IRLS) rating scale score at end of treatment and the percentage of subjects showing significant improvement on the Investigator Clinical Global Impression of Improvement (CGI-I) scale at end of treatment.

In the 600 mg dose group, the unadjusted mean reduction in the IRLS scale score was -13.8 (p less than 0.0001). 

At the end of treatment, 73% of subjects treated with 600 mg of XP13512 were reported as “much improved” or “very much improved” on the CGI-I scale (p less than 0.0001 compared with placebo). In the 1,200 mg dose group, the unadjusted mean reduction in the IRLS scale score was -13.0 versus -9.8 for placebo (p=0.0015).

At the end of treatment, 78% of subjects treated with 1,200 mg XP13512 were reported as “much improved” or “very much improved” on the CGI-I scale compared with 45% treated with placebo (p less than 0.0001). Treatment was generally well tolerated, with adverse events mild to moderate.

An New Drug Application (NDA) filing is planned for the third quarter of this year.

In February 2007, GlaxoSmithKline and XenoPort entered into an exclusive development and commercialization collaboration for the drug.

Upcoming Events

  • 28Jun

    Effective Root Cause Analysis and CAPA Investigations for the Life Sciences

  • 16Oct

    WCG MAGI's Clinical Research Hybrid Conference - 2022 West

Featured Products

  • Spreadsheet Validation: Tools and Techniques to Make Data in Excel Compliant

    Spreadsheet Validation: Tools and Techniques to Make Data in Excel Compliant

  • Surviving an FDA GCP Inspection

    Surviving an FDA GCP Inspection: Resources for Investigators, Sponsors, CROs and IRBs

Featured Stories

  • Protocol-360x240.png

    Avoid Deviations by Making Protocol Review a Team Effort

  • SelectionProcess-360x240.png

    Give Us a Voice: Sites Clamor for a Say on Vendor Selection

  • Convince-360x240.png

    Use Data and Details to Convince Site Leadership to Add Staff

  • AsktheExpertsBadge-360x240.png

    Ask the Experts: Listing Trial Staff and Others on the Statement of Investigator

Standard Operating Procedures for Risk-Based Monitoring of Clinical Trials

The information you need to adapt your monitoring plan to changing times.

Learn More Here
  • About Us
  • Contact Us
  • Privacy Policy
  • Do Not Sell My Personal Information

Footer Logo

300 N. Washington St., Suite 200, Falls Church, VA 22046, USA

Phone 617.948.5100 – Toll free 866.219.3440

Copyright © 2022. All Rights Reserved. Design, CMS, Hosting & Web Development :: ePublishing