Ownership Submission
FORM 3
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Stephan Robert
2. Date of Event Requiring Statement (Month/Day/Year)
07/28/2009
3. Issuer Name and Ticker or Trading Symbol
CORNERSTONE THERAPEUTICS INC [CRTX]
(Last)
(First)
(Middle)
C/O CHIESI FARMACEUTICI SPA, VIA PALERMO 26/A
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

PARMA, L6 43122
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(Month/Day/Year)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Stephan Robert
C/O CHIESI FARMACEUTICI SPA
VIA PALERMO 26/A
PARMA, L6 43122
  X      

Signatures

/s/ Robert Stephan 08/06/2009
**Signature of Reporting Person Date

Explanation of Responses:

No securities are beneficially owned

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
 
Remarks:
On July 28, 2009, Chiesi Farmaceutici SpA, a corporation organized under the laws of Italy, closed on its transaction to purchase from
Cornerstone Therapeutics Inc. (the "Company") 11,902,741 newly issued shares of common stock, par value $0.001 per share,
of the Company ("Common Stock"), subject to future adjustment, and an aggregate of 1,600,000 shares of Common Stock from
entities controlled by Craig A. Collard, the President and Chief Executive Officer of the Company, and Steven M. Lutz, the Executive
Vice President, Manufacturing and Trade of the Company.  In connection with the closing of this transaction, effective July 28, 2009,
Mr. Stephan was elected as a director of the newly constituted Board of Directors of the Company.  Mr. Stephan does not currently
own any shares of Common Stock or options to purchase shares of Common Stock of the Company

No securities are beneficially owned.

Exhibit List

Exhibit 24 - Power of Attorney

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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