BBC NEWS | Health | Viagra linked to blindness risk: "Anti-impotence drug Viagra increases the risk of blindness, doctors believe.
Researchers at the University of Minnesota Medical School in the US identified seven men who developed vision problems after taking Viagra.
The team, writing in the Journal of Neuro-ophthalmology,said it brought the total number of reported cases to 14.
But Pfizer, the makers of the drug which has been used by more than 20m men since its launch in 1998, said the cases were a coincidence."
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