CUPERTINO, Calif., Feb. 22 /PRNewswire-FirstCall/ -- DURECT Corporation announced today that Nycomed and DURECT have amended the Development and License Agreement entered into between the parties in 2006 covering the development and commercialization of POSIDUR™ (also known as SABER™-Bupivacaine or OPTESIA™), an investigational drug for the treatment of post-surgical pain.