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Some men taking Viagra, Levitra or Cialis have gone blind, but it's not clear whether the problem is caused by the drugs.

Pfizer spokesman Daniel Watts confirmed Friday that the drugmaker was in discussions with the FDA about adding a disclosure to Viagra's label to say that in rare cases, men taking Viagra had developed blindness. However, he said there is no proof that Viagra caused the blindness. He said that men who take Viagra often have high blood pressure and high cholesterol, which are also associated with the conditions that can cause blindness.