Viagra and other impotence drugs to carry vision loss warning

Viagra, the impotence drug produced by Pfizer, will now carry a warning about the risk of possible blindness, after the Korea Food and Drug Administration (KFDA) has approved new labelling, to warn men about possible blindness from Viagra and other drugs, for erectile dysfunction.

This means that Cialis, made by Lily and Icos Corp., and Levitra, which is produced by GlaxoSmithKline and Bayer...