GSK, XenoPort file sNDA for Horizant

LONDON — Drug makers GlaxoSmithKline and XenoPort are seeking expanded approval for their restless legs syndrome treatment.

The drug makers this week announced the submission of a supplemental new drug application to the Food and Drug Administration, requesting approval for Horizant (gabapentin enacarbil) extended-release tablets as a treatment for postherpetic neuralgia, a nerve pain that commonly is seen in patients with shingles. GSK submitted the sNDA on behalf of the two companies.

Horizant initially received regulatory approval from the FDA in April as a treatment for moderate to severe primary RLS.