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Kiddie Viagra may get Pfizer a patent extensionBy PAUL THARP Last Updated: 9:14 AM, July 28, 2010 Pfizer plans to sell a children's form of Viagra to treat a rare lung disorder as a humanitarian gesture -- in exchange for getting a six-month extension of its patent on the adult version. The Food and Drug Administration approached Pfizer about using its drug to treat a lung ailment that affects about 600 kids a year. Viagra, which modifies blood flows, could reduce unusually high blood pressure in a child's lungs, or pulmonary arterial hypertension. Symptoms include dizziness, chest pain and fatigue....