Filed by Mylan Laboratories Inc.
Pursuant to Rule 425 under the Securities Act of 1933
and deemed filed pursuant to Rule 14a-12
under the Securities and Exchange Act of 1934, as amended

Subject Company: King Pharmaceuticals, Inc.
Commission File No.: 0-24425

     This filing relates to a planned acquisition (the “Acquisition”) by Mylan Laboratories Inc. (“Mylan”) of King Pharmaceuticals, Inc. (“King”), pursuant to the terms of an Agreement and Plan of Merger, dated as of July 23, 2004 (the “Merger Agreement”), by and among Mylan, Summit Merger Corporation (a wholly-owned subsidiary of Mylan) and King. The Merger Agreement is on file with the U.S. Securities and Exchange Commission (the “SEC”) as an exhibit to the joint proxy statement/prospectus on Form S-4 filed by Mylan on September 3, 2004, and is incorporated by reference into this filing.

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Mylan Responds to Icahn Preliminary Proxy Filing

PITTSBURGH, PA – October 15, 2004 — In response to the preliminary proxy statement filed yesterday by Carl Icahn, Mylan Laboratories Inc. (NYSE: MYL) Vice Chairman and CEO, Robert J. Coury, stated: “Mr. Icahn’s anticipated proxy filing includes no new substantive information. This is not surprising in light of his admitted lack of knowledge of our industry, our company and King. The only surprise is Mr. Icahn’s belated revelation of his short position in King stock, which we believe puts his economic interests in direct conflict with other Mylan shareholders.

“We are confident that Mylan shareholders will reject Mr. Icahn’s rhetoric and focus on the business and economic fundamentals of the King transaction. Following the November 1st announcement of financial guidance on a prospective basis for the combined company, investors will be able to weigh all of the information presented to them, and we believe they will recognize that the King transaction is in their own best interests.”

Mylan also reported today that it is submitting an additional detailed response letter to UBS from Mylan’s Vice Chairman and CEO. A copy of that letter will be available at www.sec.gov.

About Mylan Laboratories:

Mylan Laboratories Inc. is a leading pharmaceutical company with four subsidiaries, Mylan Pharmaceuticals Inc., Mylan Technologies Inc., UDL Laboratories, Inc. and Mylan Bertek

Pharmaceuticals Inc., that develop, license, manufacture, market and distribute an extensive line of generic and proprietary products.

Forward-Looking Statements:

This press release includes statements that constitute “forward-looking statements”, including with regard to the King transaction, the value of the Mylan-King combination and its impact on shareholders, the shareholder vote on the transaction and the planned conference call and roadshow. These statements are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Because such statements inherently involve risks and uncertainties, actual future results may differ materially from those expressed or implied by such forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to: factors relating to satisfaction of the conditions to the acquisition, including requisite shareholder and regulatory approvals; challenges and costs relating to integration of the two businesses; the effect of any changes in customer and supplier relationships and customer purchasing patterns; uncertainties inherent in forecasts, as well as the subjectivity inherent in any probability weighted analysis underlying the Company’s assumptions and estimates with respect to the future; the impact and effects of legal or regulatory proceedings, actions or changes; general market perception of the transaction; the effects of vigorous competition on commercial acceptance of Mylan’s and King’s products and their pricing; the potential costs and product introduction delays that may result from use of legal, regulatory and legislative strategies by Mylan’s or King’s competitors; uncertainties regarding patent, intellectual and other proprietary property protections; exposure to lawsuits and contingencies associated with both Mylan’s and King’s businesses; the ability to attract and retain key personnel; other uncertainties and matters beyond the control of management of both Mylan and King; and the other risks detailed in the periodic filings filed by Mylan and by King with the Securities and Exchange Commission (the “SEC”). Neither Mylan nor King undertakes any obligation to update these statements for revisions or changes after the date of this release.

Additional Information About the Merger and Where To Find It:

In connection with the proposed merger, Mylan and King filed with the SEC on September 3, 2004, a joint proxy statement/prospectus on Form S-4 that contains important information about the Merger. These materials are not yet final and will be amended. Investors and security holders of Mylan and King are urged to read the joint proxy statement/prospectus filed, and any other relevant materials filed by Mylan or King because they contain, or will contain, important information about Mylan, King and the Merger. The preliminary materials filed on September 3, 2004, the definitive versions of these materials and other relevant materials (when they become available) and any other documents filed by Mylan or King with the SEC, may be obtained for free at the SEC’s website at www.sec.gov . Investors and shareholders of Mylan and King may also read and copy any reports, statements and other information filed by Mylan and King with the SEC at the SEC public reference room at 450 Fifth Street, N.W. Room 1200, Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 or visit the SEC’s website for further information on its public reference room. In addition, the documents filed with the SEC by Mylan may be obtained free of charge by directing such request to: Mylan Laboratories Inc., Attention: Investor Relations, 1500 Corporate Drive, Canonsburg, PA 15317, or from Mylan’s website at www.mylan.com . The documents filed with the SEC by King may be obtained free of charge by directing such request to: King Pharmaceuticals, Inc., Attn: Corporate Affairs, 501 Fifth Street, Bristol, TN 37620, or from King’s website at www.kingpharm.com . Investors and security holders are urged to read the joint proxy statement/prospectus and the other relevant materials when such other materials become available before making any voting or investment decision with respect to the proposed transaction.

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Mylan, King and their respective executive officers and directors may be deemed to be participants in the solicitation of proxies from the shareholders of Mylan and King in favor of the acquisition. Information about the executive officers and directors of Mylan and their ownership of Mylan common stock is set forth in the proxy statement for Mylan’s 2004 Annual Meeting of Shareholders, which was filed with the SEC on June 28, 2004. Information about the executive officers and directors of King and their ownership of King common stock is set forth in the proxy statement for King’s 2003 Annual Meeting of Shareholders, which was filed with the SEC on September 19, 2003. Investors and shareholders may obtain more detailed information regarding the direct and indirect interests of Mylan, King and their respective executive officers and directors in the acquisition by reading the joint proxy statement/prospectus regarding the acquisition, which is included in the Registration Statement on Form S-4 filed by Mylan with the SEC on September 3, 2004.

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