Exhibit 12

Wyeth

Computation of Ratio of Earnings to Fixed Charges

(In thousands except ratio amounts)



|                                                             |  |                              |      |                         |      |            |   |      |            |   |      |            |   |      |            |  
|------------------------------------------------------------ |  | ---------------------------- | ---- | ----------------------- | ---- | ---------- | - | ---- | ---------- | - | ---- | ---------- | - | ---- | ---------- | -
|                                                             |  | Six MonthsEnded June 30,2008 |      | Year Ended December 31, |     
|                                                             |  |                              | 2007 |                         | 2006 |            |   | 2005 |            |   | 2004 |            |   | 2003 |           
|Earnings (Loss):                                             |  |                              |      |                         |      |            |   |      |            |   |      |            |   |      |            |  
|Income (loss) from continuing operations before income taxes |  | $3,376,833                   |      | $6,456,682              |      | $5,429,904 |   |      | $4,780,589 |   |      | $(129,847) |   |      | $2,361,612 |  
|                                                             |  |                              |      |                         |      |           
|Add:                                                         |  |                              |      |                         |      |            |   |      |            |   |      |            |   |      |            |  
|Fixed charges                                                |  | 317,478                      |      | 754,290                 |      | 625,513    |   |      | 461,431    |   |      | 360,805    |   |      | 346,564    |  
|Minority interests                                           |  | 10,477                       |      | 23,277                  |      | 29,769     |   |      | 26,492     |   |      | 27,867     |   |      | 32,352     |  
|Amortization of capitalized interest                         |  | 15,900                       |      | 24,240                  |      | 22,465     |   |      | 21,356     |   |      | 9,350      |   |      | 8,772      |  
|                                                             |  |                              |      |                         |      |           
|Less:                                                        |  |                              |      |                         |      |            |   |      |            |   |      |            |   |      |            |  
|Equity income (loss)                                         |  | 89                           |      | 130                     |      | (317       | ) |      | (104       | ) |      | (524       | ) |      | (468       | )
|Capitalized interest                                         |  | 33,400                       |      | 79,600                  |      | 71,400     |   |      | 46,450     |   |      | 86,750     |   |      | 115,800    |  
|                                                             |  |                              |      |                         |      |            |   |      |            |   |      |            |   |      |            |  
|Total earnings as defined                                    |  | $3,687,199                   |      | $7,178,759              |      | $6,036,568 |   |      | $5,243,522 |   |      | $181,949   |   |      | $2,633,968 |  
|                                                             |  |                              |      |                         |      |            |   |      |            |   |      |            |   |      |            |  
|                                                             |  |                              |      |                         |      |           
|Fixed Charges:                                               |  |                              |      |                         |      |            |   |      |            |   |      |            |   |      |            |  
|Interest and amortization of debt expense                    |  | $255,224                     |      | $616,983                |      | $498,847   |   |      | $356,834   |   |      | $221,598   |   |      | $182,503   |  
|Capitalized interest                                         |  | 33,400                       |      | 79,600                  |      | 71,400     |   |      | 46,450     |   |      | 86,750     |   |      | 115,800    |  
|Interest factor of rental expense(1)                         |  | 28,854                       |      | 57,707                  |      | 55,266     |   |      | 58,147     |   |      | 52,457     |   |      | 48,261     |  
|                                                             |  |                              |      |                         |      |            |   |      |            |   |      |            |   |      |            |  
|Total fixed charges as defined                               |  | $317,478                     |      | $754,290                |      | $625,513   |   |      | $461,431   |   |      | $360,805   |   |      | $346,564   |  
|                                                             |  |                              |      |                         |      |            |   |      |            |   |      |            |   |      |            |  
|Ratio of earnings to fixed charges                           |  | 11.6                         |      | 9.5                     |      | 9.7        |   |      | 11.4       |   |      | 0.5        |   |      | 7.6        |  



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