Patients Sue GLP-1 Drugmakers Over Risk of Sudden Vision Loss: What the Evidence Shows
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Updated September 25, 2026 Popular GLP-1-based medicines are now at the center of a growing legal and medical debate over a rare form of sudden vision loss called nonarteritic anterior ischemic optic neuropathy (NAION) . Patients in the United States have filed lawsuits against the manufacturers of widely used medicines including Ozempic, Wegovy, Mounjaro and Zepbound , alleging that the drugs caused NAION and that patients were not adequately warned about the potential risk. Those lawsuits are allegations at the moment—not findings that the medications caused the injuries. The scientific evidence is still evolving and is not completely consistent. Importantly, the regulatory evidence is stronger for semaglutide , the active ingredient in Ozempic, Wegovy and Rybelsus, than for the entire GLP-1 drug class. Patient safety message: Sudden or rapidly worsening vision loss is not a symptom to monitor at home. Anyone experiencing sudden vision loss while taking a GLP-1-based medi...