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** FILE ** Pharmacist Diane Yu holds a bottle of the prescription drug Lipitor at a Maximart pharmacy in Palo Alto, Calif. in this Dec. 14, 2007 file photo. Pfizer Inc., the world's biggest drugmaker, said Thursday its first-quarter profit fell 18 percent as generic competition hurt sales of blood-pressure drug Norvasc and allergy drug Zyrtec.  Sales of the world's best-selling drug, Lipitor, fell 7 percent to $3.14 billion from $3.36 billion during the quarter.  (AP Photo/Paul Sakuma, file) Paul Sakuma / AP Photo