Acusphere to Participate in Friedman Billings Ramsey Investor Conference.

Business Editors/Health/Medical Writers

Friedman Billings Ramsey Investor Conference

WATERTOWN, Mass.--(BUSINESS WIRE)--June 1, 2004

Acusphere, Inc. (NASDAQ: ACUS) announced today that it is scheduled to present at the Friedman Billings Ramsey 8th Annual Growth Investor Conference at 3:30 PM Eastern Time on Wednesday, June 2, 2004 in New York City.

The presentation will take place at the Millennium Broadway Hotel. The audio portion of the presentation may be heard via webcast, please visit the investor relations section of the Company's website (www.acusphere.com) at least 5 minutes before the presentation.

About Acusphere, Inc.

Acusphere is a specialty pharmaceutical company that develops new drugs and improved formulations of existing drugs using its proprietary microparticle technology. Acusphere's three initial product candidates are in clinical development and are designed to address large unmet clinical needs within cardiology, oncology and asthma. These product candidates were created using proprietary technology that enables Acusphere to control the porosity and size of nanoparticles and microparticles in a versatile manner that allows particles to be customized to address the delivery needs of a variety of drugs. Acusphere's lead product candidate, AI-700, is a cardiovascular drug in Phase III clinical development. AI-700 is designed to be a preferred alternative to the estimated 9.5 million procedures done each year in the U.S. to detect coronary artery disease, the leading cause of death in the United States. For more information about Acusphere visit the Company's web site at www.acusphere.com.

"Acusphere" is trademarks of Acusphere, Inc.

The presentation to be made at the above announced conference may contain forward-looking statements, including statements regarding the successful and timely completion of clinical trials, future financing needs, commercial prospects for the Company's product candidates and technology and prospects for new partnering and business relationships. The Company's actual results may differ materially from those anticipated in these forward-looking statements based upon a number of factors, including anticipated operating losses, uncertainties associated with research, development, testing and related regulatory approvals, unproven markets, future capital needs and uncertainty of additional financing, competition, uncertainties associated with intellectual property, complex manufacturing, high quality requirements for clinical trial materials and the technical challenges associated with obtaining such material, dependence on third-party manufacturers, suppliers and collaborators, loss of key personnel, lack of sales and marketing experience, uncertainties associated with market acceptance and adequacy of reimbursement, technological change, government regulation, and other risks and challenges detailed in the Company's filings with the U.S. Securities and Exchange Commission, including its most recent Quarterly Report on Form 10-Q. Readers are cautioned not to place undue reliance on any forward-looking statements, which speak only as of the date of such presentation. The Company undertakes no obligation to publicly release the results of any revisions to these forward-looking statements that may be made to reflect events or circumstances that occur after the date of such presentation or to reflect the occurrence of unanticipated events.