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 *
  STACK DAVID M
 2. Date of Event Requiring Statement (Month/Day/Year)
02/02/2011		 3. Issuer Name and Ticker or Trading Symbol
Pacira Pharmaceuticals, Inc. [PCRX]
(Last)
(First)
(Middle)
C/O PACIRA PHARMACEUTICALS, INC., 10450 SCIENCE CENTER DRIVE		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
President and CEO
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

SAN DIEGO, CA 92121		 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)
Common Stock 18,600
I
See Footnote (1)

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
Stock Option (Right to Buy)   (2) 09/02/2020 Common Stock 185,960 $ 1.61 D  
Stock Option (Right to Buy)   (3) 09/02/2020 Common Stock 255,695 $ 1.61 D  
Stock Option (Right to Buy)   (4) 12/29/2020 Common Stock 158,466 $ 5.49 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
STACK DAVID M
C/O PACIRA PHARMACEUTICALS, INC.
10450 SCIENCE CENTER DRIVE
SAN DIEGO, CA 92121		   X     President and CEO  

Signatures

/s/ David Stack 02/02/2011
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) The shares are held by Stack Schroon Mohawk FLP. Mr. Stack is the general partner of Stack Schroon Mohawk FLP.
(2) The option vests as to 50% of the option shares on September 2, 2010 and, as to the remaining 50% of the option shares, in successive equal monthly installments for the subsequent 24 months. The option shares become exercisable, to the extent vested, from and after the Issuer's initial public offering.
(3) The option vests as to 25% of the option shares on September 2, 2011 and as to the remaining shares in successive equal monthly installments for the subsequent 36 months. The option shares become exercisable, to the extent vested, from and after the Issuer's initial public offering.
(4) The option vests as to 25% of the option shares on December 29, 2011 and as to the remaining shares in successive equal monthly installments for the subsequent 36 months. The option shares become exercisable, to the extent vested, from and after the Issuer's initial public offering.

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