‘Requip XR’ would extend GSK’s patent term: Analyst
But GSK's ability to leverage its exclusive hold on the restless legs syndrome market may depend on its ability to obtain additional patents, such as a sustained-release version.
The immediate-release formula goes off patent in 2008, noted Stewart Adkins, a Lehman Brothers analyst. At least two other firms are developing RLS treatments, Schwarz Pharma and XenoPort. Requip gained marketing approval for RLS earlier this month, although Rx data suggest a significant amount of offlabel prescribing.
A stronger version has been available for Parkinson's disease.