Levitra.com led the pack among product websites that drove consumers to the doctors to request a prescription, according to a Manhattan Research survey.

After Levitra, the brand.com sites for Chantix, Cialis, Nexium (purplepill.com), Yaz, Lyrica, NuvaRing, Symbicort, Viagra and Lunesta were the most likely to drive visitors to request a prescription from their doctor. Many of the top sites, such as those for sleep aid Lunesta and PPI Nexium, feature doctor discussion guides or worksheets on their websites, noted Manhattan Research.

The firm’s ePharma Consumer study tracked more than 320 product sites and found that 74% of visitors took a “product-related action” afterward, defined as everything from doing more online research to discussing the drug with their doctor, friends or family.