title: Patent cliff. Billions to be saved--starting now. Lipitor led the way, and other blockbusters are following.
mesh_terms: D000924:Anticholesteremic Agents / Q000191:economics*; D000069059:Atorvastatin; D017046:Cost Savings; D016568:Drugs, Generic; D006538:Heptanoic Acids / Q000191:economics*; D006801:Humans; D008329:Managed Care Programs / Q000191:economics; D010330:Patents as Topic; D011758:Pyrroles / Q000191:economics*; D014481:United States
chemical_list: D000924:Anticholesteremic Agents; D016568:Drugs, Generic; D006538:Heptanoic Acids; D011758:Pyrroles; D000069059:Atorvastatin