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The FDA approved Viagra on March 27, 1998. Viagra is the first oral pill to treat
impotence, a dysfunction that affects millions of men in the United States. The other drugs that competes with Viagra
are Cialis (tadalafil) and Levitra (vardenafil). Both drugs have been prescribed to millions of Americans and are now available all over the world.
The debate is about NAION (non-arteritic anterior ischemic optic neuropathy), which causes sudden vision loss when blood flow to the optic nerve is blocked. Optic nerve plays a critical role in vision. NAION is considered to be one of the most common causes of sudden vision loss in older Americans. Risk factors include diabetes and heart disease, which also happen to be the leading causes of impotence.
In a study by the scientists at the University of Alabama they found that men who had suffered a heart attack
(South
Beach Heart Program) were 10 times more likely to have optic nerve damage if they had been taking any of the drugs like Viagra, Cialis, or Levitra. "For patients with a history of myocardial infarction (heart attack), we did observe a strong and statistically significant association suggestive of a link between the use of Viagra and/or Cialis and an increased risk of NAION," Dr Gerald McGwin, who headed the study, said in a report in the British Journal of Ophthalmology.
Pfizer
has agreed to change the label despite arguing that no
link has been found between Viagra and blindness.
In related developments, a safety officer at the FDA
found exactly what the University of Minnesota
scientists had found more than a year ago, but like for
all other drugs like Prozac,
Adderall,
Accutane,
Vioxx,
Celebrex, Bextra, Crestor,
Natrecor,
Iressa,
etc., either the FDA refused to act or acted too slowly
in banning them. In other words, FDA seems to be
too close to the drug companies rather than working to
ensure drug safety in America. The safety officer’s experience was outlined in a letter to FDA Acting Commissioner Lester Crawford from Sen. Charles Grassley, R-Iowa, who said the agency had moved far too slowly on an emerging safety concern.
Pfizer has market Viagra
aggressively, as it did it other drugs, including
Celebrex and Bextra. The
FDA has in a few instances warned Pfizer about
misleading ads. FDA advises patients to stop taking these medicines, and call a doctor or healthcare provider right away if they experience sudden or decreased vision loss in one or both eyes. Further, patients taking or considering taking these products should inform their health care professionals if they have ever had severe loss of vision, which might reflect a prior episode of NAION. Such patients are at an increased risk of developing NAION again.
Links to new articles on Viagra and blindness
linkage
Viagra
is not always the best option to cure ED
Viagra
lawsuit against Pfizer filed
Revatio,
a form of Viagra, approved by FDA
Viagra
class action lawsuits begin
Pfizer
defends Viagra and its safety record
Intimacy
is critical for a healthy relationship
Viagra
and blindness link being investigated by the FDA
Avandia recall
Bextra recall helps with Celebrex sales
Viagra recall
Viagra causes hearing loss
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