UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

Filed by the Registrant x                            Filed by a Party other than the Registrant ¨

Check the appropriate box:

¨ Preliminary Proxy Statement

¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

¨ Definitive Proxy Statement

¨ Definitive Additional Materials

x Soliciting Material Pursuant to §240.14a-12

WYETH

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

x No fee required.

¨ Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

(1) Title of each class of securities to which transaction applies:

(2) Aggregate number of securities to which transaction applies:

(3) Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

(4) Proposed maximum aggregate value of transaction:

(5) Total fee paid:

¨ Fee paid previously with preliminary materials.

¨ Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

(1) Amount Previously Paid:

(2) Form, Schedule or Registration Statement No.:

(3) Filing Party:

(4) Date Filed:

Email Message: The following information is being provided to non-Sales Wyeth employees and is intended to guide discussions with stakeholders regarding the joint Pfizer and Wyeth announcement.

Word Document Attachment

• As a valued partner of Wyeth, we wanted to ensure that you were aware of some important news.

• On Monday, January 26, 2009, Pfizer announced that it agreed to acquire Wyeth, creating the world’s premier global biopharmaceutical company with the strongest assets, pipeline and capabilities within health care.

• The diversity, agility and scale of the combined company will enable us to more effectively address the health, wellness and unmet medical needs of patients around the world.

• At Wyeth, our company continues to operate business as usual and we remain committed to providing the highest level of service to our customers.

• Until the transaction closes, which is expected in the second half of 2009, Wyeth will continue to operate as a separate company.

• You should expect no changes during this time; you will have access to all of the same products and should not expect any change in your relationship with Wyeth.

• We will seek to keep our customers informed of developments in a timely manner.

• Additional information is available on www.wyeth.com.

This communication contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995 which represent the current expectations and beliefs of management of Wyeth concerning the proposed merger of Wyeth with Pfizer (the “merger”) and other future events and their potential effects on Wyeth. Such statements are based upon the current beliefs and expectations of our management, are not guarantees of future results and are subject to a significant number of risks and uncertainties. These forward-looking statements are inherently subject to significant business, economic and competitive uncertainties and contingencies and risk relating to the merger, many of which are beyond our control.

2

In connection with the proposed merger, Pfizer intends to file with the Securities and Exchange Commission (“SEC”) a Registration Statement on Form S-4 containing a proxy statement/prospectus for the stockholders of Wyeth and each of Wyeth and Pfizer plan to file other documents with the SEC regarding the proposed merger transaction. BEFORE MAKING ANY VOTING OR INVESTMENT DECISION, WYETH’S STOCKHOLDERS AND INVESTORS ARE URGED TO READ THE PROXY STATEMENT/PROSPECTUS AND OTHER DOCUMENTS FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME AVAILABLE, BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED MERGER. Investors and stockholders will be able to obtain, without charge, a copy of the proxy statement/prospectus, as well as other relevant documents containing important information about Wyeth and Pfizer at the SEC’s website (http://www.sec.gov) once such documents are filed with the SEC. Wyeth’s stockholders will also be able to obtain, without charge, a copy of the proxy statement/prospectus and other relevant documents when they become available by directing a request by mail or telephone to Wyeth, Five Giralda Farms, Madison, NJ 07940, Attention: Investor Relations, (877) 552-4744. Information about Wyeth’s directors and executive officers and other persons who may be participants in the solicitation of proxies from Wyeth’s stockholders is set forth in Wyeth’s annual report on Form 10-K for the fiscal year ended December 31, 2007 and Wyeth’s proxy statement for its 2008 annual meeting of stockholders, which was filed with the SEC on Schedule 14A on March 14, 2008.