X0306 4 2012-12-12 0001003642 IMPAX LABORATORIES INC IPXL 0001245188 BURR ROBERT L C/O IMPAX LABORATORIES, INC. 30831 HUNTWOOD AVENUE HAYWARD CA 94544 1 Common Stock 2012-12-12 4 S 0 1500 21 D 50125 D Common Stock 6057 I By Robert L. Burr IRA Account The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan. The filing of this Statement shall not be construed as an admission (a) that the person filing this Statement is, for the purposes of Section 16 of the Securities Exchange Act of 1934, as amended, the beneficial owner of any equity securities covered by this Statement, or (b) that this Statement is legally required to be filed by such person. /s/ Mark A. Schlossberg, by Power of Attorney 2012-12-13