US health officials are examining rare reports of blindness among some men using the impotence drug Viagra.

The US Food and Drug Administration (FDA) is investigating up to 50 reports of non-arteritic anterior ischemic optic neuropathy blindness, or NAION.

FDA spokeswoman, Susan Cruzan, said they have no evidence yet that the drug is to blame but added, “We take this seriously.”
Full: guardian.co.uk

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