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September 30, 2003

MedImmune to Announce 2003 Third Quarter Financial Results on October 23, 2003

GAITHERSBURG, Md., Sept. 30 /PRNewswire-FirstCall/ -- MedImmune, Inc.'s (Nasdaq: MEDI) third quarter financial results for 2003 will be released on Thursday, October 23, 2003 before the opening of the U.S. financial markets. The company will also host a conference call and live audio webcast at 8:00 a.m. Eastern time following the announcement. During the conference call, MedImmune's management will discuss the financial results for the quarter and other business.

The press release and the live webcast may be accessed by going to the Investor Relations section of the MedImmune website at www.medimmune.com. Following the webcast, an archived version of the call will be available at the same address until October 30, 2003.

About MedImmune, Inc.

MedImmune is a leading biotechnology company focused on researching, developing and commercializing products to prevent or treat infectious disease, autoimmune disease and cancer. MedImmune actively markets four products, Synagis(R) (palivizumab), FluMist(TM) (Influenza Virus Vaccine Live, Intranasal), Ethyol(R) (amifostine) and CytoGam(R) (cytomegalovirus immune globulin intravenous (human)), and has additional products in clinical testing. MedImmune employs approximately 1,700 people, is headquartered in Gaithersburg, Maryland, and has additional operations in Frederick, Maryland, as well as Pennsylvania, California, the United Kingdom and the Netherlands. For more information on the company, as well as copies of the product inserts for each product, visit MedImmune's website at www.medimmune.com.

This announcement may contain, in addition to historical information, certain forward-looking statements that involve risks and uncertainties. Such statements reflect management's current views and are based on certain assumptions. Actual results could differ materially from those currently anticipated as a result of a number of factors, including risks and uncertainties discussed in MedImmune's filings with the U.S. Securities and Exchange Commission. The company is developing several products for potential future marketing. There can be no assurance that such development efforts will succeed, that such products will receive required regulatory clearance or that, even if such regulatory clearance were received, such products would ultimately achieve commercial success.

SOURCE  MedImmune, Inc.
    -0-                             09/30/2003
    /CONTACT:  Media: Jamie Lacey, +1-240-632-4035, or Investors: Will
Roberts, +1-301-527-4358, or John Filler, +1-240-632-4086, all of MedImmune,
Inc./
    /Web site:  http://www.medimmune.com/
    /Audio:  http://www.medimmune.com/
    (MEDI)

CO:  MedImmune, Inc.
ST:  Maryland
IN:  BIO MTC HEA
SU:  CCA

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