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Regeneron's Eylea Has Mysterious Rise in Side Effect Reports

  • Blockbuster Eylea is biotech company’s best-selling product
  • Cause of incidents not known, though doctors are monitoring
Healthcare

Photographer: Andrew Harrer/Bloomberg

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Doctors say they’re seeing an unexplained increase in a rare, frightening side effect in patients getting Regeneron Pharmaceuticals Inc.’s top-selling product, the blockbuster eye drug Eylea.

After the drug is injected into the eye, a small number of people have a sharp decline in sight, experience pain, and can panic. While the effect is treatable and doesn’t lead to long-term vision loss, a professional society of eye physicians has warned members to look out for the condition.