Item 8.01 Other Events.

On February 20, 2013, Cornerstone Therapeutics Inc. (the "Company") issued a press release announcing that its Board of Directors has received a letter from the Company's majority stockholder, Chiesi Farmaceutici S.p.A. ("Chiesi"). In the letter, Chiesi proposed, subject to certain conditions, to acquire the shares of the Company's common stock that it does not already own for a price of between $6.40 and $6.70 per share.

On February 25, 2013, the Company issued a press release announcing that its Board of Directors had appointed a special committee comprised of five independent directors to coordinate its response to the letter received from Chiesi.

Copies of the Company's press releases are filed as exhibits to this Report. A copy of Chiesi's letter was previously filed as Exhibit 13 to the Schedule 13D/A filed by Chiesi on February 19, 2013.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits. See the Exhibit Index attached hereto.

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