Pfizer's smoking cessation treatment Chantix was the top searched prescription brand in February, generating more than 500,000 search queries, according to internet measurement firm comScore. 
Shire's Adderall for ADHD and Pfizer's erectile dysfunction treatment Viagra came in a close second and third on the list, respectively.

Five of the 15 most frequently searched prescription brands were depression treatments. Those treatments included Lilly's Cymbalta and Prozac, Wyeth's Effexor, Forest's Lexapro and GlaxoSmithKline's Paxil.

Most Commonly Searched Prescription Brands
February 2008 Total US – Home/Work/University Locations

Brand Name Search queries (000)
Chantix 507
Adderall 469
Viagra 348
Ambien 334
Lexapro 274
Effexor 264
Cymbalta 235
Lyrica 233
Seroquel 198
Lipitor 181
Prozac 174
Cialis 120
Paxil 119
Crestor 119
Singulair 114
Source: comScore, Inc.