The US Food and Drug Administration (FDA) said today it had received more than 40 reports of a type of blindness in men taking impotence drugs, mostly involving Pfizer's Viagra.
The FDA said it has received about 38 reports of the rare condition among users of Viagra, four reports of blindness among users of Eli Lilly's Cialis and one report of the condition in men talking Levitra, made by GlaxoSmithKline.
Pfizer said Viagra, outside of clinical trials, has been used by more than 23 million men worldwide over the past seven years and that no proof exists that the blindness is linked to the drug, which was introduced in 1998 and had $1.68 bn in sales in 2004.
However, Pfizer and FDA are in talks to change the label on the impotence drug Viagra after the reports of blindness.
