Amylyx Launches U.S. Expanded Access Program for Avexitide — First-in-Class Peptide GLP-1 Receptor Antagonist in Post-Bariatric Hypoglycemia
Amylyx Pharmaceuticals on May 5 launched a U.S. Expanded Access Program (EAP) for up to 250 adults with post-bariatric hypoglycemia (PBH) following Roux-en-Y gastric bypass surgery. The investigational compound, avexitide, is a first-in-class peptide GLP-1 *receptor antagonist* — designed to bind GLP-1 receptors on pancreatic islet beta cells and block the exaggerated GLP-1-driven insulin response characteristic of PBH, reducing inappropriate insulin secretion and stabilizing blood glucose. Avexitide carries FDA Breakthrough Therapy Designation for both PBH and congenital hyperinsulinism, plus Orphan Drug Designation. Topline data from the pivotal Phase 3 LUCIDITY trial are anticipated in Q3 2026. The program inverts the standard GLP-1 narrative — for this population, GLP-1 signaling is the problem.