For the 20 million American men estimated to suffer impotence at some point in their lives, the pill is a godsend, as it should be for Pfizer: analysts estimate Viagra's sales could reach $500 million by 2003. Pfizer's stock, meanwhile, was, um, rising slowly on the news, reaching 95 7/16 at midday.
One rather odd side effect: The FDA reports that 3 percent of users experienced a temporary vision disturbance that left them unable to distinguish between the colors blue and green. Just keep the lights out.