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 WASHINGTON (AP) - The government on Friday ordered warnings onto the labels of Viagra and two other impotence drugs that some users have developed a form of blindness — while cautioning that it's impossible to know if the pills are to blame.
The Food and Drug Administration's move comes as the agency is under intense pressure to investigate more aggressively and warn the public about drug side effects.
At issue is sudden vision loss when blood flow to the optic nerve is blocked, a condition called NAION or non-arteritic anterior ischemic optic neuropathy.
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