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SEC FORM 4 SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

SIGMA TAU INTERNATIONAL SA

(Last)

(First)

(Middle)

(Street)

(City)

(State)

(Zip)

2. Issuer Name and Ticker or Trading Symbol
QUESTCOR PHARMACEUTICALS INC [ QSC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

Director	X	10% Owner
Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
05/12/2003

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock, no par value per share	05/12/2003	05/12/2003	S		9,500	D	1	16,451,375	D⁽¹⁾

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

1. Name and Address of Reporting Person^*

SIGMA TAU INTERNATIONAL SA

(Last)

(First)

(Middle)

(Street)

(City)

(State)

(Zip)

1. Name and Address of Reporting Person^*

SIGMA TAU FINANZIARIA

(Last)

(First)

(Middle)

(Street)

(City)

(State)

(Zip)

1. Name and Address of Reporting Person^*

DEFIANTE FARMACEUTICA UNIPESSOAL LDA

(Last)

(First)

(Middle)

(Street)

(City)

(State)

(Zip)

1. Name and Address of Reporting Person^*

CAVAZZA CLAUDIO

(Last)

(First)

(Middle)

(Street)

(City)

(State)

(Zip)

1. Name and Address of Reporting Person^*

CAVAZZA PAOLO

(Last)

(First)

(Middle)

(Street)

(City)

(State)

(Zip)

1. Name and Address of Reporting Person^*

APTAFIN S P A

(Last)

(First)

(Middle)

(Street)

(City)

(State)

(Zip)

Explanation of Responses:

1. Shares solely owned by Sigma-Tau International S.A. (f/k/a Sigma-Tau Finance Holding S.A.). Sigma-Tau Finanziaria S.p.A. owns 100% of the capital stock of Sigma-Tau International S.A. and 58% of the capital stock of Defiante Farmaceutica L.d.A. Sigma-Tau International S.A. owns 42% of the capital stock of Defiante Farmaceutica L.d.A. Claudio Cavazza owns, directly and indirectly, 60% of Sigma-Tau Finanziaria S.p.A. and Paolo Cavazza owns, directly and indirectly, 40% of Sigma-Tau Finanziaria S.p.A.

	Antonio Nicolai, Attorney-in-fact for Mauro Bove, Director, on behalf of Sigma-Tau International S.A.	05/13/2003
	Antonio Nicolai, Attorney-in-fact for Mario Artali, Managing Director, on behalf of Sigma-Tau Finanziari SpA	05/13/2003
	Antonio Nicolai, Attorney-in-fact for Raffele Sanguigni, Director, on behalf of Defiante Farmaceutica L.D.A.	05/13/2003
	Antonio Nicolai, Attorney-in-fact for Claudio Cavazza	05/13/2003
	Antonio Nicolai, Attorney-in-fact for Paolo Cavazza	05/13/2003
	Antonio Nicolai, Attorney-in-fact for Piero Belletti, Managing Director, on behalf of Aptafin S.p.A.	05/13/2003
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (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).
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