Synthetic Biologics to Report Third Quarter 2013 Financial Results

— Company Focused on Novel Anti-Infectives for the Prevention and Treatment of Serious Infectious Diseases —

— Conference Call Scheduled for Thursday, November 14, 2013, at 10:00 am EST —

ROCKVILLE, Md., Nov. 7, 2013 /PRNewswire/ — Synthetic Biologics, Inc. (NYSE MKT: SYN), a developer of biologics focused on the prevention and treatment of serious infectious diseases, announced today that it intends to release its financial results for the third quarter ended September 30, 2013 on Thursday, November 14, 2013.

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The Company will hold an investor conference call on Thursday, November 14, 2013, at 10:00 am EST. During the call, Jeffrey Riley, Synthetic Biologics’ Chief Executive Officer, will provide a brief quarterly update of the Company’s multiple sclerosis program and its anti-infective drug pipeline for infectious diseases, including its oral enzyme candidate for the prevention of C. difficile infections. C. Evan Ballantyne, Synthetic Biologics’ Chief Financial Officer, will review the Company’s financial results for the third quarter ended September 30, 2013.

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=96920. 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=96920 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 biologics for the prevention and treatment of serious infectious diseases. The Company is developing an oral enzyme for the prevention of C. difficile infections, and a series of monoclonal antibody therapies for the treatment of Pertussis and Acinetobacter infections. In addition, the Company is developing a drug candidate for the treatment of relapsing-remitting multiple sclerosis and cognitive dysfunction in multiple sclerosis. For more information, please visit Synthetic Biologics’ website at www.therivabio.com.

To download Synthetic Biologics’ investor relations mobile device app, which allows users access to the Company’s SEC documents, press releases and events, please click on the following links to download the IRapp on your iPhone and iPad or your Android mobile device.

SOURCE Synthetic Biologics, Inc.