SAN DIEGO, Aug. 24, 2011 (GLOBE NEWSWIRE) -- Zogenix, Inc. (Nasdaq:ZGNX) announced today that it has filed a registration statement on Form S-1 with the U.S. Securities and Exchange Commission (SEC) relating to a proposed underwritten public offering of 12,000,000 shares of its common stock, or up to 13,800,000 shares if the underwriters exercise in full their option to purchase additional shares. All shares of the common stock to be sold in the offering will be offered by Zogenix.