The risk of vision loss for users of medication like Viagra and Cialis appears to be small, but might prompt added warning labels.
The findings seem to be the first from a large epidemiological study to link SRD and RVO to taking erectile dysfunction drugs. And according to lead author Mahyar Etiminan, it’s the first to quantify the added risk of these conditions. Compared to non-users, for instance, men taking these drugs were 2.58 times more likely to develop SRD, 1.44 times more likely to develop RVO, and 2.02 times more likely to develop ION.
This kind of research can’t definitively prove that these drugs are causing these conditions. But the authors suspect, Etiminan told Gizmodo in an email, that “these drugs can compromise blood flow to the optic nerve and arteries/veins of the retina.”The authors note that the absolute odds of having any of these conditions following PDE5 use are still very small. But given that as many as 20 to 30 million men in the U.S.
“ION already has a warning but RVO and SRD don’t have strong warnings. We believe they should also have strong warnings,” said Etiminan, an eye disease researcher and epidemiologist at the University of British Columbia. “I would say men who have underlying ocular issues like glaucoma or retinal conditions should discuss with their ophthalmologist before starting the drugs.
While this new study does indicate that PDE5 drugs in general can rarely cause these serious eye problems, the authors say that more research should be done to figure out whether certain drugs in this class are riskier than others.
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