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Pfizer (English: Pfizer) is a multinational pharmaceutical and biotechnology company originating from the United States, with its operating headquarters in New York and its R&D headquarters in Groton, Connecticut. Its stock became a constituent stock of the Dow Jones Industrial Index on April 8, 2004. According to revenue ranking, it is the world's largest pharmaceutical company. Weiergang is an aphrodisiac drug developed by Pfizer. The emergence of Weiergang can be said to be the most topical drug at the end of the twentieth century. 威而鋼購買