Rosen Law Firm, a global investor rights law firm, announces the filing of a class action lawsuit on behalf of purchasers of Tetraphase Pharmaceuticals, Inc. securities (NASDAQ:TTPH) from March 5, 2015 through September 8, 2015, all dates inclusive (the "Class Period"). The lawsuit seeks to recover damages for Tetraphase Pharmaceuticals investors under the federal securities laws.

To join the Tetraphase Pharmaceuticals class action, go to the firm's website at http://rosenlegal.com/cases-830.html or call Phillip Kim, Esq. or Kevin Chan, Esq. of Rosen Law Firm toll free at 866-767-3653 or via email at pkim@rosenlegal.com or kchan@rosenlegal.com.

NO CLASS HAS YET BEEN CERTIFIED IN THE ABOVE ACTION. UNTIL A CLASS IS CERTIFIED, YOU ARE NOT REPRESENTED BY COUNSEL UNLESS YOU RETAIN ONE. YOU MAY ALSO REMAIN AN ABSENT CLASS MEMBER AND DO NOTHING AT THIS POINT. YOU MAY RETAIN COUNSEL OF YOUR CHOICE.

The Complaint alleges that Defendants throughout the Class Period misrepresented the efficacy and safety of Eravacycline, and attendant capacity for approval by both the U.S. Food and Drug Administration ("FDA") and the European Medicines Agency ("EMA"). When the true details entered the market, the lawsuit claims that investors suffered damages.

A class action lawsuit has already been filed. If you wish to serve as lead plaintiff, you must move the Court no later than March 28, 2016. A lead plaintiff is a representative party acting on behalf of other class members in directing the litigation. If you wish to join the litigation, go to the firm's website at http://rosenlegal.com/cases-830.html for more information. You may also contact Phillip Kim, Esq. or Kevin Chan, Esq. of Rosen Law Firm toll free at 866-767-3653 or via email at pkim@rosenlegal.com or kchan@rosenlegal.com.

Rosen Law Firm represents investors throughout the globe, concentrating its practice in securities class actions and shareholder derivative litigation.

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