Exhibit 31.1
CERTIFICATION OF DISCLOSURE
AS ADOPTED PURSUANT TO
SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002
I, Robert Essner, certify that:
1. I have reviewed this Quarterly Report on Form 10-Q of Wyeth;
2. Based on my knowledge, this report does not contain any
untrue statement of a material fact or omit to state a
material fact necessary to make the statements made, in
light of the circumstances under which such statements were
made, not misleading with respect to the period covered by
this report;
3. Based on my knowledge, the financial statements, and other
financial information included in this report, fairly
present in all material respects the financial condition,
results of operations and cash flows of the registrant as
of, and for, the periods presented in this report;
4. The registrant's other certifying officer(s) and I are
responsible for establishing and maintaining disclosure
controls and procedures (as defined in Exchange Act Rules
13a-15(e) and 15d-15(e)) for the registrant and have:
(a) Designed such disclosure controls and procedures, or
caused such disclosure controls and procedures to be
designed under our supervision, to ensure that material
information relating to the registrant, including its
consolidated subsidiaries, is made known to us by
others within those entities, particularly during the
period in which this report is being prepared;
(b) Evaluated the effectiveness of the registrant's
disclosure controls and procedures and presented in
this report our conclusions about the effectiveness of
the disclosure controls and procedures, as of the end
of the period covered by this report based on such
evaluation; and
(c) Disclosed in this report any change in the registrant's
internal control over financial reporting that occurred
during the registrant's most recent fiscal quarter (the
registrant's fourth fiscal quarter in the case of an
annual report) that has materially affected, or is
reasonably likely to materially affect, the
registrant's internal control over financial reporting;
and
5. The registrant's other certifying officer(s) and I have
disclosed, based on our most recent evaluation of internal
control over financial reporting, to the registrant's
auditors and the audit committee of the registrant's board
of directors (or persons performing the equivalent
functions):
(a) All significant deficiencies and material weaknesses in
the design or operation of internal control over
financial reporting which are reasonably likely to
adversely affect the registrant's ability to record,
process, summarize and report financial information;
and
(b) Any fraud, whether or not material, that involves
management or other employees who have a significant
role in the registrant's internal control over
financial reporting.
Dated: August 8, 2003
By /s/ Robert Essner
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Robert Essner
Chairman, President and Chief Executive Officer