Strong Pipeline. Top-selling drugs include Champix, Enbrel, Ibrance, Lipitor, Lyrica, Medrol, Norvasc, Prevnar and Viagra, and PFE has a large pipeline to replace its earners once they lose patent protection. The company currently has about 30 Phase 3 projects going. Now that the baby boomers are entering their retirement years, it's reasonable to think the PFE comes up with some new hits.