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Given the demand for sildenafil (Viagra) and the reluctance of many patients and physicians to discuss erectile dysfunction openly, it is not surprising that the drug has been marketed extensively on the Internet. These researchers conducted a systematic evaluation of Web sites that sold sildenafil directly to consumers in April and May of 1999.
The authors identified 77 sites (71 percent of which were U.S.-based) that offered sildenafil directly to consumers. Medical information about sildenafil was provided by only 55 percent of the sites. A similar percentage required consumers to complete an online medical evaluation questionnaire, but only 35 percent noted that a physician would review the questionnaire. Only half the sites asked whethe…