Exhibit 12

Wyeth

Computation of Ratio of Earnings to Fixed Charges

(in thousands except ratio amounts)



|                                                             |  |                                   |   |  |                         |   |  |           |   |  |            |   |      |            |  |           
|------------------------------------------------------------ |  | --------------------------------- | - |  | ----------------------- | - |  | --------- | - |  | ---------- | - | ---- | ---------- |  | ----------
|                                                             |  | Three Months Ended March 31, 2006 |   |  | Year Ended December 31,
|                                                             |  | 2005                              |   |  | 2004                    |   |  | 2003      |   |  | 2002       |   | 2001
|Earnings (Loss):                                             |  |                                   |   |  |                         |   |  |           |   |  |            |   |      |            |  |           
|Income (loss) from continuing operations before income taxes |  | $1,460,615                        |   |  | $4,780,589              |   |  | $(129,847 | ) |  | $2,361,612 |   |      | $6,097,245 |  | $2,868,747
|Add:                                                         |  |                                   |   |  |                         |   |  |           |   |  |            |   |      |            |  |           
|Fixed charges                                                |  | 148,750                           |   |  | 461,431                 |   |  | 360,805   |   |  | 346,564    |   |      | 430,449    |  | 439,058   
|Minority interests                                           |  | 6,693                             |   |  | 26,492                  |   |  | 27,867    |   |  | 32,352     |   |      | 27,993     |  | 20,841    
|Amortization of capitalized interest                         |  | 5,500                             |   |  | 21,356                  |   |  | 9,350     |   |  | 8,772      |   |      | 8,866      |  | 2,497     
|Less:                                                        |  |                                   |   |  |                         |   |  |           |   |  |            |   |      |            |  |           
|Equity income (loss)                                         |  | (132                              | ) |  | (104                    | ) |  | (524      | ) |  | (468       | ) |      | 20,766     |  | 70,372    
|Capitalized interest                                         |  | 14,700                            |   |  | 46,450                  |   |  | 86,750    |   |  | 115,800    |   |      | 88,008     |  | 94,257    
|                                                             |  |                                   |   |  |                         |   |  |           |   |  |            |   |      |            |  |           
|Total earnings (loss) as defined                             |  | $1,606,990                        |   |  | $5,243,522              |   |  | $181,949  |   |  | $2,633,968 |   |      | $6,455,779 |  | $3,166,514
|                                                             |  |                                   |   |  |                         |   |  |           |   |  |            |   |      |            |  |           
|Fixed Charges:                                               |  |                                   |   |  |                         |   |  |           |   |  |            |   |      |            |  |           
|Interest and amortization of debt expense                    |  | $119,513                          |   |  | $356,834                |   |  | $221,598  |   |  | $182,503   |   |      | $294,160   |  | $301,145  
|Capitalized interest                                         |  | 14,700                            |   |  | 46,450                  |   |  | 86,750    |   |  | 115,800    |   |      | 88,008     |  | 94,257    
|Interest factor of rental expense (1)                        |  | 14,537                            |   |  | 58,147                  |   |  | 52,457    |   |  | 48,261     |   |      | 48,281     |  | 43,656    
|                                                             |  |                                   |   |  |                         |   |  |           |   |  |            |   |      |            |  |           
|Total fixed charges as defined                               |  | $148,750                          |   |  | $461,431                |   |  | $360,805  |   |  | $346,564   |   |      | $430,449   |  | $439,058  
|                                                             |  |                                   |   |  |                         |   |  |           |   |  |            |   |      |            |  |           
|Ratio of earnings to fixed charges                           |  | 10.8                              |   |  | 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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