Exhibit 12

Wyeth

Computation of Ratio of Earnings to Fixed Charges

(in thousands except ratio amounts)



|                                                             |  |                                    |      |  |                         |      |  |           |      |  |            |      |  |            |  |           
|------------------------------------------------------------ |  | ---------------------------------- | ---- |  | ----------------------- | ---- |  | --------- | ---- |  | ---------- | ---- |  | ---------- |  | ----------
|                                                             |  | Nine MonthsEnded September 30,2006 |      |  | Year Ended December 31,
|                                                             |  |                                    | 2005 |  |                         | 2004 |  |           | 2003 |  |            | 2002 |  | 2001      
|Earnings (Loss):                                             |  |                                    |      |  |                         |      |  |           |      |  |            |      |  |            |  |           
|Income (loss) from continuing operations before income taxes |  | $4,335,300                         |      |  | $4,780,589              |      |  | $(129,847 | )    |  | $2,361,612 |      |  | $6,097,245 |  | $2,868,747
|                                                             |  |                                    |      |  |                         |     
|Add:                                                         |  |                                    |      |  |                         |      |  |           |      |  |            |      |  |            |  |           
|Fixed charges                                                |  | 466,670                            |      |  | 461,431                 |      |  | 360,805   |      |  | 346,564    |      |  | 430,449    |  | 439,058   
|Minority interests                                           |  | 22,538                             |      |  | 26,492                  |      |  | 27,867    |      |  | 32,352     |      |  | 27,993     |  | 20,841    
|Amortization of capitalized interest                         |  | 16,665                             |      |  | 21,356                  |      |  | 9,350     |      |  | 8,772      |      |  | 8,866      |  | 2,497     
|                                                             |  |                                    |      |  |                         |     
|Less:                                                        |  |                                    |      |  |                         |      |  |           |      |  |            |      |  |            |  |           
|Equity income (loss)                                         |  | (479                               | )    |  | (104                    | )    |  | (524      | )    |  | (468       | )    |  | 20,766     |  | 70,372    
|Capitalized interest                                         |  | 51,350                             |      |  | 46,450                  |      |  | 86,750    |      |  | 115,800    |      |  | 88,008     |  | 94,257    
|                                                             |  |                                    |      |  |                         |      |  |           |      |  |            |      |  |            |  |           
|Total earnings (loss) as defined                             |  | $4,790,302                         |      |  | $5,243,522              |      |  | $181,949  |      |  | $2,633,968 |      |  | $6,455,779 |  | $3,166,514
|                                                             |  |                                    |      |  |                         |      |  |           |      |  |            |      |  |            |  |           
|                                                             |  |                                    |      |  |                         |     
|Fixed Charges:                                               |  |                                    |      |  |                         |      |  |           |      |  |            |      |  |            |  |           
|Interest and amortization of debt expense                    |  | $371,709                           |      |  | $356,834                |      |  | $221,598  |      |  | $182,503   |      |  | $294,160   |  | $301,145  
|Capitalized interest                                         |  | 51,350                             |      |  | 46,450                  |      |  | 86,750    |      |  | 115,800    |      |  | 88,008     |  | 94,257    
|Interest factor of rental expense (1)                        |  | 43,611                             |      |  | 58,147                  |      |  | 52,457    |      |  | 48,261     |      |  | 48,281     |  | 43,656    
|                                                             |  |                                    |      |  |                         |      |  |           |      |  |            |      |  |            |  |           
|Total fixed charges as defined                               |  | $466,670                           |      |  | $461,431                |      |  | $360,805  |      |  | $346,564   |      |  | $430,449   |  | $439,058  
|                                                             |  |                                    |      |  |                         |      |  |           |      |  |            |      |  |            |  |           
|                                                             |  |                                    |      |  |                         |     
|Ratio of earnings to fixed charges                           |  | 10.3                               |      |  | 11.4                    |      |  | 0.5       |      |  | 7.6        |      |  | 15.0       |  | 7.2       



|(1) | A 1/3 factor was used to compute the portion of rental expenses deemed representative of the interest factor.
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