Contrave

Treatment for Obesity

Update: Contrave (bupropion/naltrexone) Now FDA Approved - September 10, 2014

FDA Accepts Contrave NDA

Orexigen Therapeutics Announces FDA Acceptance of Contrave New Drug Application for the Treatment of Obesity

SAN DIEGO, June 1 /PRNewswire-FirstCall/ -- Orexigen Therapeutics, Inc., a biopharmaceutical company focused on the treatment of obesity, today announced that the U.S. Food and Drug Administration (FDA) has accepted for filing the Company's New Drug Application (NDA) for Contrave (naltrexone SR/bupropion SR), its investigational drug for the treatment of obesity. The NDA is based on a substantial body of evidence gathered through the Contrave Obesity Research (COR) clinical program, which included over 4,500 patients.

"We are pleased the FDA has accepted our NDA for filing and look forward to working with the Agency during the review process," said Michael Narachi, President and CEO of Orexigen. "If approved, we believe Contrave will become an important therapeutic option for obese patients, making weight loss and weight maintenance an achievable cornerstone in the treatment of obesity and its common co-morbidities."

About the COR Phase 3 Program

All four trials in the COR Phase 3 program (COR-I, COR-II, COR-BMOD and COR- Diabetes) were randomized, double-blind, placebo-controlled trials. The co-primary endpoints were the proportion of patients achieving at least 5% weight loss and percent change in body weight compared to placebo. Secondary endpoints included multiple measures of cardiometabolic risk, quality of life, control of eating, and glycemic control.

About Contrave

Contrave is an investigational combination therapy believed to address both physiological and behavioral drivers of obesity. The two components of this combination therapy act in a complementary manner in the central nervous system. The central pathways targeted by this treatment are involved in controlling the balance of food intake and metabolism, and regulating reward-based eating behavior. In clinical trials, Contrave was shown to help obese patients initiate and sustain significant weight loss, improve important markers of cardiometabolic risk and increase ability to control eating.

About Orexigen Therapeutics

Orexigen Therapeutics, Inc. is a biopharmaceutical company focused on the treatment of obesity. Further information about the Company can be found at http://www.orexigen.com/.

Forward-Looking Statements

Orexigen cautions you that statements included in this press release that are not a description of historical facts are forward-looking statements. Words such as "believes," "anticipates," "plans," "expects," "indicates," "will," "intends," "potential," "suggests," "assuming," "designed" and similar expressions are intended to identify forward-looking statements. These statements are based on the Company's current beliefs and expectations. These forward-looking statements include statements regarding the potential for, and timing of, approval for Contrave and the Company's belief that this product candidate may be an important therapeutic option in the treatment of obesity. The inclusion of forward-looking statements should not be regarded as a representation by Orexigen that any of its plans will be achieved. Actual results may differ from those set forth in this release due to the risk and uncertainties inherent in the Orexigen business, including, without limitation: the uncertainty of the FDA approval process and other regulatory requirements; the therapeutic and commercial value of Contrave; reliance on third parties to assist with the development of Contrave; the potential for adverse safety findings relating to Contrave; and other risks described in the Company's filings with the Securities and Exchange Commission. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof, and Orexigen undertakes no obligation to revise or update this news release to reflect events or circumstances after the date hereof. Further information regarding these and other risks is included under the heading "Risk Factors" in the Company's Quarterly Report on Form 10-Q, which was filed with the Securities Exchange Commission on May 10, 2010 and is available from the SEC's website (www.sec.gov) and on our website (www.orexigen.com) under the heading "Investor Relations". All forward-looking statements are qualified in their entirety by this cautionary statement. This caution is made under the safe harbor provisions of Section 21E of the Private Securities Litigation Reform Act of 1995.

Source: Orexigen Therapeutics, Inc.

CONTACT: Graham Cooper, Chief Financial Officer, Orexigen, +1-858-875-8600, Media, Liz Frank, WCG, +1-212-301-7216

Web Site: http://www.orexigen.com/

Posted: June 2010

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