EXHIBIT 21



SUBSIDIARIES OF THE COMPANY

DECEMBER 31, 2006



|                                          |  |                                 
|----------------------------------------- |  | --------------------------------
|Name                                      |  | State or Countryof Incorporation
|United States                             |  |                                 
|A H Investments LTD.(1)                   |  | Delaware                        
|AC Acquisition Holding Company            |  | Delaware                        
|Ayerst-Wyeth Pharmaceuticals Incorporated |  | Delaware                        
|CICL Corporation                          |  | Delaware                        
|Genetics Institute, LLC                   |  | Delaware                        
|Route 24 Holdings, Inc.                   |  | Delaware                        
|Wyeth Pharmaceuticals, Inc.               |  | Delaware                        
|Wyeth Holdings Corporation                |  | Maine                           
|Wyeth-Ayerst International Inc.           |  | New York                        
|Wyeth-Ayerst Lederle, Inc.                |  | Puerto Rico                     
|Wyeth-Whitehall Pharmaceuticals, Inc.     |  | Puerto Rico                     
|Berdan Insurance Company                  |  | Vermont                         
|                                          | 
|International                             |  |                                 
|Fort Dodge Australia Pty. Limited         |  | Australia                       
|Wyeth Australia Pty. Limited              |  | Australia                       
|Fort Dodge Saude Animal Ltda.             |  | Brazil                          
|Wyeth Industrias Farmaceutica Ltda.       |  | Brazil                          
|Wyeth Canada(2)                           |  | Canada                          
|Wyeth Consumer Healthcare Inc.            |  | Canada                          
|Wyeth Pharmaceutical Co., Ltd.            |  | China                           
|Wyeth (Shanghai) Trading Company, Ltd.    |  | China                           
|Wyeth Pharmaceuticals FZ-LLC              |  | Dubai                           
|John Wyeth & Brother Limited              |  | England                         
|Wyeth Pharmaceuticals France              |  | France                          
|Wyeth-Pharma GmbH                         |  | Germany                         
|Wyeth Hellas S.A.                         |  | Greece                          
|AHP Finance Ireland Limited               |  | Ireland                         
|Wyeth Lederle S.p.A.                      |  | Italy                           
|Wyeth KK                                  |  | Japan                           
|Wyeth Korea, Inc.                         |  | Korea                           
|Wyeth S.A. de C.V.                        |  | Mexico                          
|AHP Manufacturing B.V.                    |  | Netherlands                     
|Wyeth Philippines, Inc.                   |  | Philippines                     
|Wyeth Nutritionals (Singapore) Pte. Ltd.  |  | Singapore                       
|Fort Dodge Veterinaria, S.A.              |  | Spain                           
|Wyeth Farma S.A.                          |  | Spain                           
|Wyeth A.B.                                |  | Sweden                          
|Dimminaco AG                              |  | Switzerland                     
|Laboratorios Wyeth S.A.                   |  | Venezuela                       

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|(1) | On January 31, 2007, AH Investments Ltd. was merged into AHP Subsidiary Holding Corporation, which
was then merged on January 31, 2007 into Wyeth.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------



|(2) | Wyeth Canada is a partnership
between two of our affiliates.
|--- | ------------------------------------------------------------



There have been omitted from
the above list the names of the subsidiaries which, considered in the aggregate as a single subsidiary, would not constitute a significant subsidiary.