Tetraphase Pharmaceuticals, Inc.

Shareholder Securities Fraud Litigation

Rigrodsky & Long, P.A. Announces A Securities Fraud Class Action Lawsuit Has Been Filed Against Tetraphase Pharmaceuticals, Inc. (NASDAQ GS: TTPH)

Rigrodsky & Long, P.A. announces that a complaint has been filed in the United States District Court for the District of Massachusetts on behalf of all persons or entities that purchased the common stock of Tetraphase Pharmaceuticals, Inc. (“Tetraphase” or the “Company”) (NASDAQ GS: TTPH) between March 5, 2015 and September 8, 2015, inclusive (the “Class Period”), alleging violations of the Securities Exchange Act of 1934 against the Company and certain of its officers (the “Complaint”).

If you purchased shares of Tetraphase during the Class Period, or purchased shares prior to the Class Period and still hold Tetraphase, and wish to discuss this action or have any questions concerning this notice or your rights or interests, please contact Timothy J. MacFall, Esquire or Peter Allocco of Rigrodsky & Long, P.A., 2 Righter Parkway, Suite 120, Wilmington, DE 19803 at (888) 969-4242; by e-mail to

The Complaint alleges that throughout the Class Period, defendants made materially false and misleading statements, and omitted materially adverse facts, about the Company’s business, operations and prospects.  As a result of defendants’ alleged false and misleading statements, the Company’s stock traded at artificially inflated prices during the Class Period.

According to the Complaint, on September 8, 2015, following close of market, Tetraphase issued a press release announcing results of the pivotal portion of the IGNITE2 phase 3 clinical trial of Eravacycline.  The Company disclosed that Eravacycline, administered as an intravenous (IV) to oral transition therapy for the treatment of complicated urinary tract infections, had failed to achieve its primary endpoint of statistical non-inferiority compared to Levofloxacin under the guidelines established by both the FDA and EMA.

On this news, shares of Tetraphase dropped over 78%, closing at $9.49 per share on September 9, 2015, on heavy trading volume.

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.  Any member of the proposed class may move the court to serve as lead plaintiff through counsel of their choice, or may choose to do nothing and remain an absent class member.

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