New Drug Applications

Entereg

alvimopan

Treatment for Postoperative Ileus

Update: Entereg Now FDA Approved - May 20, 2008

FDA Extends Review of NDA for Entereg (alvimopan)

EXTON, Pa. & PHILADELPHIA--(BUSINESS WIRE)--Feb 8, 2008 - Adolor Corporation and GlaxoSmithKline today announced that the U.S. Food and Drug Administration (FDA) has informed Adolor that the Prescription Drug User Fee Act action date for the New Drug Application (NDA) for Entereg (alvimopan) has been extended to May 10, 2008. Adolor also today announced the submission to the FDA of a revised Risk Management Program for Entereg.

The NDA for Entereg 12 mg capsules is for in-hospital, short-term use for the management of postoperative ileus (POI). Specifically, the proposed indication is for the acceleration of upper and lower gastrointestinal recovery following partial large or small bowel resection surgery with primary anastomosis. There are no other FDA approved drugs for this indication.

"Earlier this week, we submitted to the FDA a revised risk management program for Entereg," said Michael R. Dougherty, president and chief executive officer of Adolor Corporation. "We believe the program provides appropriate measures to ensure that Entereg is used in patients for whom it has demonstrated a favorable benefit:risk profile. We look forward to working with the FDA as it completes its review of our NDA."

About Adolor Corporation

Adolor Corporation (Nasdaq:ADLR) is a biopharmaceutical company specializing in the discovery, development and commercialization of novel prescription pain management products. Adolor has two lead product candidates in development: Entereg (alvimopan) for the management of the gastrointestinal side effects associated with opioid use; and novel Delta opioid receptor agonists for a variety of pain indications. Adolor and GlaxoSmithKline are collaborating in the worldwide development and commercialization of Entereg in multiple indications. Adolor and Pfizer are collaborating in the worldwide development and commercialization of two Delta agonists for pain. Adolor also has a number of discovery research programs focused on the identification of novel compounds for the treatment of pain. By applying its knowledge and expertise in pain management, along with ingenuity, Adolor is seeking to make a positive difference for patients, caregivers and the medical community. For more information, visit www.adolor.com.

About GlaxoSmithKline

GlaxoSmithKline is one of the world's leading research-based pharmaceutical and healthcare companies and is committed to improving the quality of human life by enabling people to do more, feel better and live longer. For more information, visit GlaxoSmithKline on the World Wide Web at www.gsk.com.

Adolor Forward-Looking Statements
This release, and oral statements made with respect to information contained in this release, may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements include those which express plan, anticipation, intent, contingency, goals, targets or future development and/or otherwise are not statements of historical fact. These statements are based upon management's current expectations and are subject to risks and uncertainties, known and unknown, which could cause actual results and developments to differ materially from those expressed or implied in such statements. Such known risks and uncertainties relate to, among other factors: the risk that Adolor may not receive regulatory approval of Entereg (alvimopan) for POI, OBD, or any other indication; the risk that the PDUFA date extended to May 10, 2008 is further extended or not met; the risk that a risk management plan acceptable to the FDA could materially adversely affect the commercial prospects for Entereg, if regulatory approval is achieved; the risk that Adolor may not be able to adequately address the deficiencies in the November 2006 FDA approvable letter; the risk that Adolor may not obtain FDA approval for Entereg in POI, Adolor's inability to provide additional data satisfactory to the FDA to obtain approval for the NDA, the adequacy of the safety and efficacy data from all of the Entereg studies, changing regulatory requirements, the risk that the FDA may not agree with Adolor's and GSK's analyses of the Entereg studies (including Study 014) and may evaluate the results of these studies by different methods or conclude that the results from the studies, whether or not statistically significant, do not support safety, efficacy, a favorable risk/benefit profile, or there were human errors in the conduct of the studies, or otherwise; adverse safety findings in any Entereg studies; the risk that the alvimopan Investigational New Drug Applications (INDs) remain on clinical hold indefinitely; the risk that filing targets for regulatory submissions or user fee goal dates are not met; the risk that the results of other clinical trials of Adolor's drug product candidates, including Entereg, are not positive; the risk of product liability claims; reliance on third party manufacturers; the costs, delays and uncertainties inherent in scientific research, drug development, clinical trials and the regulatory approval process; Adolor's history of operating losses since inception and its need for additional funds to operate its business; Adolor's reliance on its collaborators, including GSK, in connection with the development and commercialization of Entereg; market acceptance of Adolor's products, if regulatory approval is achieved; competition; and securities litigation.

Further information about these and other relevant risks and uncertainties may be found in Adolor's Reports on Form 8-K, 10-Q and 10-K filed with the U.S. Securities and Exchange Commission. Adolor urges you to carefully review and consider the disclosures found in its filings which are available in the SEC EDGAR database at http://www.sec.gov and from Adolor at http://www.adolor.com. Given the uncertainties affecting pharmaceutical companies in the development stage, you are cautioned not to place undue reliance on any such forward-looking statements, any of which may turn out to be wrong due to inaccurate assumptions, unknown risks, uncertainties or other factors. Adolor undertakes no obligation to (and expressly disclaims any such obligation to) publicly update or revise the statements made herein or the risk factors that may relate thereto whether as a result of new information, future events, or otherwise.

GSK Cautionary statement regarding forward-looking statements
Under the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995, the company cautions investors that any forward-looking statements or projections made by the company, including those made in this Announcement, are subject to risks and uncertainties that may cause actual results to differ materially from those projected. Factors that may affect the Group's operations are described under 'Risk Factors' in the `Business Review' in the company's Annual Report on Form 20-F for 2006.

This press release is available on the website http://www.adolor.com.

Contact

Adolor Corporation
Lizanne Wentz, Corporate Communications
484-595-1500
or
Media:
Sam Brown Inc.
Mike Beyer, 773-463-4211
or
GlaxoSmithKline
US Media:
Jeff McLaughlin, 919-483-2839
or
US Investor Relations:
Frank Murdolo, 215-751-7002
or
Tom Curry, 215-751-5419