QCOR (MM)

As filed with the Securities and Exchange Commission on August 14, 2014

Registration No. 333-102988

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

POST-EFFECTIVE AMENDMENT NO. 1

TO

FORM S-3

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

1300 Kellogg Drive, Suite D

Anaheim, California 92807

(714) 786-4200

(Address, including zip code, and telephone number,

including area code, of registrant’s principal executive offices)

Approximate date of commencement of proposed sale to the public: Not applicable. Removal from registration of securities that were not sold pursuant to this registration statement.

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box.   ¨

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box:   ¨

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.   ¨

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.   ¨

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box.   ¨

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box.   ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b2 of the Exchange Act.

DEREGISTRATION OF SECURITIES

On February 5, 2003, Questcor Pharmaceuticals, Inc. (the “ Company ”) filed a Registration Statement on Form S-3 (Registration No. 333-102988) (the “ Registration Statement ”) with the Securities and Exchange Commission (the “ SEC ”), which Registration Statement was deemed effective upon filing. The Registration Statement registered shares of the Company’s common stock, no par value (the “ Shares ”), for resale by selling stockholders named in the Registration Statement.

On August 14, 2014, pursuant to the Agreement and Plan of Merger, dated April 5, 2014, among the Company, Mallinckrodt plc, an Irish public limited company (“ Mallinckrodt ”), and Quincy Merger Sub, Inc., a Delaware corporation and a wholly-owned subsidiary of Mallinckrodt (“ Merger Sub ”), the Company will be merged with and into Merger Sub, with the Company being the surviving entity (the “ Merger ”).

In connection with the Merger, the Company is terminating all of its offerings of securities pursuant to its existing registration statements, including the Registration Statement. In accordance with an undertaking made by the Company in the Registration Statement, the Company hereby removes from registration all Shares that remain unsold as of the date of this Post-Effective Amendment No. 1.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, the Company certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this Post-Effective Amendment to Registration Statement on Form S-3 to be signed on its behalf by the undersigned, thereunto duly authorized, in the city of Anaheim, State of California, on this 14th day of August, 2014.

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