A widely used drug for a bladder condition has possibly been damaging people’s eyes for decades without anyone’s knowledge.

Reports first surfaced last year that Elmiron, which is prescribed for interstitial cystitis, can be toxic to the retina.

This past weekend, researchers presented more evidence of Elmiron’s effects at the annual meeting of the American Academy of Ophthalmology in San Francisco. The study hasn’t been published yet in a peer-reviewed journal.

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