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23/11/2015 Pfizer and Allergan agree to merge

2:36

Pfizer, Allergan Lead In Busy Year for Mergers

2:56

Pfizer-Allergan $160 billion merger sparks debate

7:15

Pfizer-Allergan Merger: Is it Just About the US Taxes?

3:36

Failed Pfizer-Allergan Deal: Other Mergers Affected?

1:07

Allergan, Pfizer Call Off Proposed $160B Merger

Pfizer Inc. is an American pharmaceutical corporation headquartered in New York City and is considered one of the world's largest pharmaceutical companies. The company was expected to merge with Allergan plc, in a deal that would have been worth $160 billion. The merger was called off due to recent new rules from the United States Treasury.
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    • Essentials 

    • 1849–2000 

    • 2000–2010 

    • 2000: Warner–Lambert acquisition 

    • 2003: Pharmacia acquisition 

    • 2009: Wyeth acquisition 

    • 2010: King Pharmaceuticals acquisition 

    • 2011–present 

    • 2013: Zoetis spin-off 

    • 2015: Hospira acquisition 

    • 2015: Attempted Allergan acquisition 

    • 2017: Pfizer Consumer Healthcare 

    • 2019: Sale of Upjohn & formation of Viatris 

    • 2020: COVID-19 vaccine 

    • Acquisition history 

    • Partnerships 

    • Research and development 

    • Products 

    • Promotional practices 

    • Controversies 

    • ''Nigeria Trovafloxacin Controversy.'' 

    • Litigation in which Pfizer was not a party 

    • Environmental record 

    • Political lobbying