Pfizer Inc is a research-based global pharmaceutical company that discovers, develops, manufactures and markets leading prescription medicines for humans and animals, and many of the world's best-known consumer brands. Following the acquisition of Pharmacia in 2003, Pfizer has become the largest pharmaceutical company in the world with over 165 million people globally taking a Pfizer medicine each day.

Currently, Pfizer employs approximately 130,000 people in over 60 countries and has sales in more than 150 countries. Pfizer has major US Research and Development (R&D) sites in New London & Groton (Connecticut), Alameda & La Jolla (California), Holland & Ann Arbor (Michigan), with major international sites in Sandwich (United Kingdom), Nagoya & Tokyo (Japan) and Amboise & Fresnes (France).

In 2002, expenditure on R&D was estimated at $5.3 billion - the largest investment of any pharmaceutical company and of any private sector research institution in the world.

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