Isis Pharmaceuticals, Inc. Announces Third Quarter 2005 Financial Results Webcast

CARLSBAD, Calif., Nov. 8 /PRNewswire-FirstCall/ -- Isis Pharmaceuticals, Inc. announces the following webcast:

What: Isis Pharmaceuticals’ Third Quarter 2005 Financial Results When: Tuesday, November 8, 2005, at 10:00 a.m. ET / 7:00 a.m. PT Where: www.isispharm.com How: Live on the Internet. Simply log onto our website listed above. Contact: Claudine Prowse, Ph.D. Investor Relations and Corporate Communications (760) 603-2331

If you are unable to participate during the live event, a replay of the webcast will be available for a limited time at www.isispharm.com.

ABOUT ISIS PHARMACEUTICALS, INC.

Isis Pharmaceuticals, Inc. is exploiting its expertise in RNA to discover and develop novel drugs for its product pipeline and for its partners. The Company has successfully commercialized the world’s first antisense drug and has 12 antisense drugs in development to treat metabolic, cardiovascular, ocular and inflammatory diseases, and cancer. In its Ibis division, Isis is developing and commercializing the TIGER biosensor system, a revolutionary system to identify infectious organisms. As an innovator in RNA-based drug discovery and development, Isis is the owner or exclusive licensee of approximately 1,500 issued patents worldwide. Additional information about Isis is available at www.isispharm.com.

This webcast includes forward-looking statements regarding our business, the financial position of Isis Pharmaceuticals, and the therapeutic and commercial potential of Isis’ technologies and products in development. Any statement describing Isis’ goals, expectations, intentions or beliefs is a forward-looking statement and should be considered an at-risk statement, including those statements that are described as Isis’ goals. Such statements are subject to certain risks and uncertainties, particularly those inherent in the process of discovering, developing, and commercializing drugs that are safe and effective for use as human therapeutics, and in the endeavor of building a business around such products. Isis’ forward-looking statements also involve assumptions that, if they never materialize or prove correct, could cause its results to differ materially from those expressed or implied by such forward-looking statements. Although Isis’ forward-looking statements reflect the good faith judgment of its management, these statements are based only on facts and factors currently known by Isis. As a result, you are cautioned not to rely on these forward-looking statements. These and other risks concerning Isis’ programs are described in additional detail in Isis’ annual report on Form 10-K for the year ended December 31, 2004, and its quarterly report on Form 10-Q for the quarter ended June 30, 2005, which are on file with the SEC. Copies of these and other documents are available from the Company.

Isis Pharmaceuticals, Inc.

CONTACT: Investor Relations and Corporate Communications, Claudine Prowse,Ph.D., of Isis Pharmaceuticals, Inc., +1-760-603-2331

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