Ongoing lawsuits allege GLP-1s can cause serious harm. But we don't know how often
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His suit is part of two main ongoing consolidated lawsuits alleging life-threatening or life-altering harm from GLP-1 drugs.

In a statement to NPR, spokespeople for Novo Nordisk pointed to subsequent research casting doubt on whether their GLP-1 drug causes NAION, for example, and said the cases are without merit.

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The legal question before the courts hinges in part on whether the GLP-1 drugs caused the harm. Observational data can show correlation — that people taking GLP-1s were perhaps more likely to have this eye complication occur — but not causation. For that, more detailed investigation is needed.

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