Pfizer Inc, the world's largest research-based pharmaceutical company, discovers, develops, manufactures and markets prescription medicines in 11 therapeutic areas including . Pfizer's annual UK R&D investment is more than £550 million – more than £10 million a week.oncology, cardiovascular, pain, neuroscience and infectious diseases, including HIV/AIDS. Pfizer is also the world's largest animal health company.

Pfizer Inc employs approximately 90,000 colleagues worldwide, all of whom are devoted to working for a healthier world. Pfizer conducts more biomedical research than any other organisation, and has 12,000 professionals working in six major R&D sites worldwide, including Sandwich in Kent

In the UK, Pfizer has its European R&D headquarters at Sandwich and its UK business headquarters in Surrey, and is the major supplier of medicines to the NHS.