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The Food and Drug Administration (FDA) reported May 27, 2005 that it is investigating reports that four men who had been using Cialis reported they went blind allegedly from the impotence medication.
All four men, as well as another 38 Viagra users, developed an eye problem called nonarteritic anterior ischemic optic neuropathy, or NAION. Essentially, NAION is a stroke which occurs in the optic nerve. Typically this condition results in painless partial to complete blindness in the affected eye.
Cialis is adding an additional one-line warning on its label about this potential side effect.
A three-year-old study of blindness and prescription erectile dysfunction medication prompted the investigation. Dr. Robert Egan, associate professor ophthalmological neurology and neurosurgery at Oregon Health and Science university’s Casey Eye Institute, one of the authors of the original study.
People affected with NAION usually have other health concerns, most notably high blood pressure, or diabetes. NAION also occurs in those who smoke cigarettes. Eye doctors say that the patients who suffer with this condition all have a crowded optic nerve.
Normally, the chance of developing this eye condition is two or three to 100,000. The eye condition is more common in Caucasians than African Americans and more common in men than in women.
Typically
symptoms of NAION include a painless loss of vision in only one eye. However,
if NAION occurs while a man is using an erectile dysfunction medication,
the loss of vision could be preceded by a headache.
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