Healthcare market research firm Manhattan Research last week named the top 10 leading Web site destinations for doctors from a new study to be released next week.According to the study results, the top 10 Web sites most visited by physicians are:1.Pfizer’s Lipitor.2. Merck’s Fosamax. 3.Shire’s Adderall XR.4.GlaxoSmithKline’s Advair.5.Bristol-Myers Squibb and Sanofi-Aventis’ Plavix.6.Johnson & Johnson’s Concerta.7.Merck’s Singulair. 8.Forest’s Lexapro.9.AstraZeneca’s Crestor. 10. Merck and Schering-Plough’s Zetia.Mark Bard, president of Manhattan Research, said, “Although prescription volume is certainly an important ingredient in driving most physician traffic to a product site, the data show ‘top’ sites typically include those with a direct-to-consumer advertising component as well as new products on the market. It is not just experience with a product that drives physician traffic to a specific site but in many cases the need for additional information. This represents a key promotional opportunity for pharmaceutical marketers today.”