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23/11/2015 Pfizer and Allergan agree to merge

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.


  • Essentials 

  • Types 

  • History 

  • Warner–Lambert acquisition 

  • Operations 

  • Products 

  • Promotional practices 

  • Litigation 

  • Environmental record 

  • Political lobbying 

  • Employment and diversity 

  • Involvement in developing world health issues