Since its launch in 1998, Viagra, the first treatment for impotence, has revolutionized the lives of men of a certain age: over 23 million worldwide have used the blue diamond, -- in the form of pills to spice up your love life.
From the spring of 2005, U.S. health officials are examining reports that causes blindness among a small number of men at risk. Viagra blindness risk was reported in March 2005 in the Journal of Neuro-ophthalmology. The journal study examined seven cases where the men had an unusual form of sudden blindness within 36 hours After Taking Viagra.
A Pfizer spokesman Daniel Watts said there was no proof that Viagra caused the blindness. He said the men who take Viagra often have high blood pressure and high cholesterol are also associated with conditions that can cause blindness. This form of sudden blindness is caused by blockage of blood flow to the optic nerve and is most common in older people, who disproportionately use Viagra.
All these patients had risk factors for this type of vision loss, including blood pressure, high cholesterol or diabetes.
As the researchers remain uncertain, the FDA officials said they did not know whether the drugs can cause blindness. But he ordered the labels of medicines for erectile dysfunction should include warnings about a possible link with sudden blindness. The new label said that the vision loss, called nonarteritic anterior ischemic optic neuropathy, "has been reported rarely.
Canadian Ministry also advises users of erectile dysfunction Drugs Viagra, Cialis or Levitra to seek "immediate medical attention" if they experience sudden vision loss or other problems visualization
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