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                                  Pfizer, Inc.
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                              Pharmacia Corporation
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The following is a communication to employees.



Transaction update :Current and future business performance

from Goran Ando

In this update, I'd like to review briefly our current business performance in
Pharmacia, look at some of the expectations we should have about the new Pfizer
business and finally give you an update on the status of corporate and R&D
transition/integration activities.

PHARMACIA CURRENT BUSINESS PERFORMANCE

Despite the challenges facing the industry in general and our own specific
challenges with the loss of Ambien, Pharmacia is continuing to show competitve
increases in sales growth and earnings per share growth in 2002.

There are many individual product successes that are contributing to this. For
example :

- - The COX-2 market is showing continued differentiation and market share for the
Pharmacia portfolio has now risen to 62%, with Vioxx now down to 38%.

- - Xalatan, with a 27% marketshare continues to hold off the challenges of the
Alphagan franchise and also Lumigan and Travatan.

- - Zyvox continues to grow strongly, with the US sales since launch increasing at
a faster rate than the benchmark product in this area, Primaxin.

- - Other products such as Camptosar and Detrol are also continuing to help drive
performance.

Overall, it's clear that our commercial colleagues are maintaining an excellent
focus on delivering our business objectives. And as always, continuing this
success - whether in R&D, GPB or elsewhere - is what will create the greatest
value moving forward.

PFIZER : FUTURE BUSINESS PERFORMANCE

Looking ahead we should have the same very positive sense about the future of
the new Pfizer organisation. There is every indication that bringing together
two fast-growing, high performance companies will produce an extremely strong,
highly competitive organisation.

The pharma product portfolio will be unequalled in the industry, with no less
than 14 major products that are number one in their field. Also, there are
important opportunities for synergies.

Examples in the prescription pharma business include optimising the
commercialisation of eplerenone, the bringing together of the two companies
strengths in oncology and opening the way for more effective utilisation of the
sales force through a wider range of product offerings.

Elsewhere, other examples include the combining of existing strong businesses in
Animal Health and Consumer Healthcare.

The risk associated with patent exposure of the combined companies' product
portfolio is also low and of course the strength of the combined R&D
organisation - both in terms of its portfolio and it's ability to attract new
technology and development partners - is considerable.




And as the process of describing the business rationale to the outside world has
continued, it's clear that these significant opportunities are now being better
and better understood by the investment community and healthcare organisations.

TRANSITION/INTEGRATION

As you will have seen, the leaders of the various transition teams met earlier
this week to continue integration planning. Some important points that I'd like
to emphasise in this regard are as follows:

- - There was a consistently supportive, constructive and sensitive approach from
all the participants that recognised very clearly that this is an uncertain time
for many people.

- - Pfizer has clearly paid a great deal of attention to making sure that the
integration is well-organised and well-run and ensuring that things happen in a
timely fashion.

- - Decision-making will be managed through Pfizer's current governance mechanisms
- - their Division Heads (such as Peter Corr for R&D) and the Pfizer Leadership
Team.

- - As part of this activity, we are currently focusing on understanding the
high-level differences between the Pfizer and Pharmacia organisational
structures, so that the transition work plan can be appropriately mapped out.

- - We should understand that Pharmacia will be moving into the Pfizer
"footprint". And so, while the opportunity will be taken for identifying any
possible organisational/process improvements, we should expect that by and large
the Pfizer model will be followed.

- - For R&D, Bob Karr (Transition Team leader for R&D) has set up a team within
Pfizer that is in the process of drafting a summary work plan for the R&D
integration, which will probably be available for initial review by the end of
this month. Peter and I will then review this draft and after which we should
soon be in a position to communicate the plan and start implementation.

As well as the above activities, I've personally had the opportunity to meet not
only with our Singapore Development Team, but also with several of our key
collaborators including Celltech and the Karolinska institute.

As with our other internal staff and external partners, the objective here is to
do all we can to keep our focus on business delivery while at the same time,
having an appropriate understanding of where we are in the transition process.

In conclusion, let me underline a few key points.

- - Firstly, I continue to be impressed by the way in which R&D is delivering on
business objectives - a very, very, professional performance.

- - Secondly, I hope you can start to see some of the sense of excitement that
surrounds the new Pfizer company.

- - Thirdly, the planning for integration is clearly going well and I remain very
positive about the type of process we will see

- - Finally, as always, thank you again for your efforts : these are truly
appreciated.

         With best regards,

         Goran Ando



                              SAFE HARBOR STATEMENT

Certain statements contained in this document are "forward-looking statements"
provided under the "safe harbor" protection of the Private Securities Litigation
Reform Act of 1995. These statements are made to enable a better understanding
of the Company's business, but because these forward-looking statements are
subject to many risks, uncertainties, future developments and changes over time,
actual results may differ materially from those expressed or implied by such
forward-looking statements. Examples of forward-looking statements are
statements about anticipated financial or operating results, financial
projections, business prospects, future product performance, future research and
development results, anticipated regulatory filings and approvals, and other
matters that are not historical facts. Such statements often include words such
as: "believes", "expects", "anticipates", "intends", "plans", "estimates", or
similar expressions.

These forward-looking statements are based on the information that was currently
available to the Company, and the expectations and assumptions that were deemed
reasonable by the Company, at the time when the statements were made. The
Company does not undertake any obligation to update any forward-looking
statements in any communications of the Company, whether as a result of new
information, future events, changed assumptions or otherwise, and all such
forward-looking statements should be read as of the time when the statements
were made, and with the recognition that these forward-looking statements may
not be complete or accurate at a later date.

Many factors may cause or contribute to actual results or events being
materially different from those expressed or implied by such forward-looking
statements. Although it is not possible to predict or identify all such factors,
they may include the following: competition for our products; pharmaceutical
pricing, price constraints and other restrictions on the marketing of products
imposed by governmental agencies or by managed care groups, institutions and
other purchasing agencies; product discovery and approval; product recalls or
withdrawals; manufacturing quality issues with respect to our products;
compliance with Current Good Manufacturing Practices and other quality assurance
guidelines; the company's ability to secure and defend its intellectual property
rights; product liability claims, antitrust litigation, environmental concerns,
and commercial disputes; social, legal, political and governmental developments;
changes in foreign currency exchange rates or in general economic or business
conditions including inflation and interest rates; acquisitions, divestitures,
mergers, restructurings or strategic initiatives that change the Company's
structure; business combinations among the Company's competitors and major
customers; changes to accounting standards or GAAP.

Readers are also urged to carefully review and consider the disclosures in
Pharmacia's various SEC filings, including but not limited to Pharmacia's Annual
Report on Form 10-K for the year ended December 31, 2001, and Quarterly Report
on Form 10-Q for the quarterly period ended March 31, 2002.




This release may be deemed to be solicitation material in respect of Pfizer's
proposed merger with Pharmacia. Pfizer will be filing a registration statement
on Form S-4, containing a joint proxy statement/prospectus for Pfizer and
Pharmacia, and other documents with the Securities and Exchange Commission
("SEC"). INVESTORS AND SECURITYHOLDERS ARE URGED TO READ THE REGISTRATION
STATEMENT CONTAINING THE JOINT PROXY STATEMENT/PROSPECTUS AND ANY OTHER RELEVANT
DOCUMENTS FILED OR THAT WILL BE FILED WITH THE SEC WHEN THEY BECOME AVAILABLE
BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION. Investors and securityholders
will be able to receive the registration statement containing the joint proxy
statement/prospectus and other documents free of charge at the SEC's web site,
www.sec.gov or from Pharmacia Investor Relations at 100 Route 206 North,
Peapack, New Jersey 07977. Pharmacia and its directors and executive officers
and other members of management and employees may be deemed to be participants
in the solicitation of proxies in respect of the proposed transaction.
Information regarding the interests of Pharmacia's directors and executive
officers in the proposed merger will be included in the final joint proxy
statement/prospectus.