X0303 4 2009-06-10 0 0001145404 CORNERSTONE THERAPEUTICS INC CRTX 0001226491 MCEWAN ALASTAIR STUART C/O CORNERSTONE THERAPEUTICS INC. 1255 CRESCENT GREEN DRIVE, SUITE 250 CARY NC 27518 1 0 0 0 Common Stock 2009-06-10 4 S 0 6865 8.50 D 55145 D Common Stock 2009-06-11 4 S 0 300 8.50 D 54845 D The price reported in Column 5 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.50 to $8.57, inclusive. The reporting person undertakes to provide to Cornerstone Therapeutics Inc., any security holder of Cornerstone Therapeutics Inc., or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote to this Form 4. /s/ David Price, attorney in fact for Alastair McEwan pursuant to a power of attorney 2009-06-11