Recently, FDA updated the labeling of the three leading oral erectile dysfunction (ED) medications (Cialis, Levitra and Viagra) with a warning about the sudden vision loss, attributed to NAION (non arteritic ischemic optic neuropathy). While such updates are fairly common in the post-marketing period of any drug, in the case of Viagra it brought to the surface some information not very willingly disclosed by its maker. In the efforts to downplay the significance of NAION incidence, Pfizer reported that by mid-2005 a total of 27 million men have taken safely Viagra…
That’s it! For full seven years since the launch in 1998, Viagra has been used by only 1% of the world’s male population. Is this more, or less or in the range of what has been expected? Given the massive advertising campaign (over 100 million US$ in US alone), the unprecedented public interest and brand awareness, the common belief was - and likely still is, that Viagra is already taken virtually by everybody.
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