SAN DIEGO and NEW HAVEN, Conn., Oct. 14, 2013 /PRNewswire/ -- Shareholder rights law firm Robbins Arroyo LLP announces that an investor of Achillion Pharmaceuticals, Inc. (NASDAQ: ACHN) has filed a federal securities fraud class action complaint in the U.S. District Court, District of Connecticut. The complaint alleges that the company and certain of its officers violated the Securities and Exchange Act of 1934 between April 21, 2012 and September 27, 2013 (the "Class Period"). (Logo: http://photos.prnewswire.com/prnh/20130103/MM36754LOGO) Learn more about our investigation on our Shareholder Rights Blog: http://www.robbinsarroyo.com/shareholders-rights-blog/achillion-pharmaceuticals-inc/Achillion Accused of Misleading Investors Regarding Viability of Sovaprevir Shares of Achillion fell $4.22 per share, or more than 58%, on September 27, 2013, after the company disclosed that the U.S. Food and Drug Administration ("FDA") continued its clinical hold on sovaprevir, its premier investigative drug for the treatment of hepatitis. This steep decline comes just two months after Achillion experienced an initial 25% decline per share on the announcement that the FDA instituted the clinical hold on July 1, 2013. According to the complaint, defendants made false and/or misleading statements and failed to disclose material adverse facts about the company's business, operations, and prospects, including the safety and suitability of sovaprevir. Defendants failed to inform investors that sovaprevir did not interact well with other drugs commonly administered to treat hepatitis and/or HIV, and misled investors to believe that even though patients in the company's clinical trials for sovaprevir had elevations in liver enzymes, that these liver enzymes elevations were transient and returned to baseline values and were attributable to non-drug-related factors. If you invested in Achillion and would like to discuss your shareholder rights please contact attorney Darnell R. Donahue at (800) 350-6003, DDonahue@robbinsarroyo.com, or via the shareholder information form on the firm's website. Robbins Arroyo LLP is a nationally recognized leader in securities litigation and shareholder rights law. The firm represents individual and institutional investors in shareholder derivative and securities class action lawsuits, and has helped its clients realize more than $1 billion of value for themselves and the companies in which they have invested. For more information, please go to http://www.robbinsarroyo.com. Attorney Advertising. Past results do not guarantee a similar outcome.