Synthetic Biologics to Report First Quarter 2014 Financial Results

— Conference Call Scheduled for Thursday, May 15, 2014, at 8:30 am EDT —

ROCKVILLE, Md., May 9, 2014 /PRNewswire/ — Synthetic Biologics, Inc. (NYSE MKT: SYN), a developer of novel anti-infective biologic and drug candidates targeting specific pathogens that cause serious infections and diseases, announced today that it intends to release its financial results for the three months ended March 31, 2014 on Thursday, May 15, 2014. The Company will hold an investor conference call on Thursday, May 15, 2014, at 8:30 am EDT.

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During the call, Jeffrey Riley, Synthetic Biologics’ Chief Executive Officer, will provide an update of the Company’s anti-infective drug pipeline for serious infections and diseases, including the prevention of C. difficile infections, reducing the impact of methane producing organisms on constipation-predominant irritable bowel syndrome (C-IBS) and the treatment of Pertussis, as well as its multiple sclerosis program. C. Evan Ballantyne, Synthetic Biologics’ Chief Financial Officer, will review the Company’s financial results for the three months ended March 31, 2014.

Interested parties should call 1-877-870-4263 (U.S. toll free), 1-855-669-9657 (Canada toll free), or +1 412-317-0790 (International), fifteen minutes before the start of the call to register. Registered callers on the toll free line may ask to be placed in the queue for the Question & Answer Session. The call will also be webcast over the Internet at http://www.videonewswire.com/event.asp?id=99332. If you are unable to participate during the live conference call, the webcast will be available for replay at the same URL, http://www.videonewswire.com/event.asp?id=99332, for 30 days after the call.

About Synthetic Biologics, Inc.

Synthetic Biologics, Inc. (NYSE MKT: SYN) is a biotechnology company focused on the development of novel anti-infective biologic and drug candidates targeting specific pathogens that cause serious infections and diseases. The Company is developing an oral biologic to protect the gastrointestinal microflora from the effects of IV antibiotics for the prevention of Clostridium difficile (C. difficile) infection, an oral treatment to reduce the impact of methane producing organisms on constipation-predominant irritable bowel syndrome (C-IBS), a series of monoclonal antibodies for the treatment of Pertussis and Acinetobacter infections, and a biologic targeted at the prevention and treatment of a root cause of a subset of IBS. In addition, the Company is developing an oral estriol drug for the treatment of relapsing-remitting multiple sclerosis (MS) and cognitive dysfunction in MS. For more information, please visit Synthetic Biologics’ website at www.therivabio.com.

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SOURCE Synthetic Biologics, Inc.