Exhibit 99.1

USE OF CERTAIN TERMS

Except as otherwise indicated or unless the context otherwise requires, the information included in this offering circular about Mallinckrodt (as defined below) assumes the completion of all of the transactions referred to in this offering circular in connection with the Ikaria Acquisition (as defined below). As used in this offering circular, except where otherwise specified or unless the context otherwise requires:

Except as otherwise indicated, references in this offering circular to Mallinckrodt’s fiscal 2014, fiscal 2013, fiscal 2012, fiscal 2011 and fiscal 2010 are to Mallinckrodt’s fiscal years ended September 26, 2014, September 27, 2013, September 28, 2012, September 30, 2011 and September 24, 2010, respectively. Except as otherwise indicated, all references to “dollars” or “$” in this offering circular are references to U.S. dollars.

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Summary Unaudited Pro Forma Combined Financial Data

The following table sets forth the summary unaudited pro forma condensed combined financial data at the dates and for the periods indicated. The following is presented to illustrate the estimated effects of (i) the pending acquisition of Ikaria by Mallinckrodt, which was announced on March 5, 2015, (ii) the acquisition of Questcor by Mallinckrodt, which was completed on August 14, 2014, (iii) the acquisition of Cadence by Mallinckrodt, which was completed on March 19, 2014, (iv) the related financings to fund the transactions based on the historical financial position and results of operations of Mallinckrodt and (v) the related tax effects from the transactions.

The following unaudited pro forma condensed combined financial information is provided for informational purposes only. The unaudited pro forma condensed combined statements of income assume that the aforementioned transactions occurred on September 28, 2013. The unaudited pro forma condensed combined statements of income are not necessarily indicative of operating results that would have been achieved had the acquisitions of Ikaria, Questcor and Cadence occurred on September 28, 2013, nor is it intended to project the future financial results of Mallinckrodt after the acquisitions. The unaudited pro forma condensed combined balance sheet assumes that the Ikaria Acquisition was completed on December 26, 2014. The unaudited pro forma condensed combined balance sheet does not necessarily reflect what Mallinckrodt’s financial position would have been had the Ikaria Acquisition been completed on December 26, 2014, or for any future or historical period. The unaudited pro forma condensed combined financial information has been prepared using certain assumptions, as described in “Unaudited Pro Forma Combined Financial Information,” which management believes are reasonable and do not reflect the cost of any integration activities, benefits from any synergies that may be derived from the acquisitions of Ikaria, Questcor and Cadence or revenue growth that may be anticipated.

The financial statements included and/or incorporated by reference in this offering circular with respect to the Issuers are the financial statements of Mallinckrodt plc, the ultimate parent of the Issuers, which will be a guarantor of the notes, and not the financial statements of the Issuers themselves. The Issuers cannot assure you that the historical financial information as set forth in this offering circular will be indicative of their future financial performance or their ability to meet their obligations, including repayment of the notes. The unaudited condensed consolidating financial statements of Mallinckrodt for the three months ended December 26, 2014 and as of December 26, 2014 and September 26, 2014, and the unaudited condensed financial statements for the three months ended December 27, 2013, are included in Mallinckrodt’s Quarterly Report on Form 10-Q for the quarterly period ended December 26, 2014. The audited consolidating financial statements of Mallinckrodt for the twelve months ending September 26, 2014 are included in Mallinckrodt’s Annual Report on Form 10-K for the fiscal year ended September 26, 2014 and Mallinckrodt’s Current Report on Form 8-K filed on April 3, 2015.

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The unaudited pro forma condensed combined financial data and related notes should be read in conjunction with “The Ikaria Acquisition,” “Use of Proceeds,” “Selected Historical Financial Data of Mallinckrodt,” “Selected Historical Financial Data of Ikaria,” the historical financial statements and related notes of Mallinckrodt, Questcor and Cadence incorporated by reference into this offering circular and the historical financial statements and related notes of Ikaria and Target included in this offering circular.

On a pro forma basis for the three months ended December 26, 2014, approximately 49.6% of net sales would have been generated by Mallinckrodt’s Specialty Brands segment, approximately 29.6% were generated by Mallinckrodt’s Specialty Generics segment and approximately 20.8% were generated by Mallinckrodt’s Global Medical Imaging segment, excluding sales to Mallinckrodt’s former parent.

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Summary Combined EBITDA and Adjusted EBITDA

The following tables set forth EBITDA and Adjusted EBITDA and other selected financial data of Mallinckrodt, Cadence, Questcor and Ikaria. EBITDA and Adjusted EBITDA are non-GAAP financial measures. Non-GAAP financial measures should not be considered in isolation from, or as a substitute for, financial information presented in compliance with GAAP, and non-GAAP financial measures as used herein may not be comparable to similarly titled amounts used by other companies or persons. Mallinckrodt, Cadence, Questcor and Ikaria calculate certain non-GAAP financial metrics, including Adjusted EBITDA, using different methodologies. Consequently, these financial metrics as used by Mallinckrodt, Cadence, Questcor and Ikaria may not be directly comparable to one another or with how each company has calculated similarly titled metrics in the past.

Mallinckrodt management believes that presenting these measures may provide useful information about Mallinckrodt’s, Cadence’s, Questcor’s and Ikaria’s performance by excluding items that are not indicative of their respective core operating performances. However, these measures do not reflect actual cash expenditures and are not comparable to non-GAAP measures used by other companies.

The data provided below should be read in conjunction with the information incorporated by reference into or included within this offering circular. The data provided below were based on, and should be read in conjunction with, the historical consolidated financial statements and related notes of each of Mallinckrodt, Questcor and Cadence for the applicable periods, which are incorporated herein by reference, and the historical financial statements and related notes of Target and Ikaria included in this offering circular.

For an explanation of the adjustments made to and a reconciliation from net income (as reported) to EBITDA and Adjusted EBITDA for each of Mallinckrodt, Cadence, Questcor and Ikaria, please see the footnotes to the tables below.

The following table sets forth EBITDA and Adjusted EBITDA, and the reconciliations to net income, for each of (i) Mallinckrodt for the twelve months ended December 26, 2014 (“Mallinckrodt LTM”); (ii) Cadence for the period beginning on January 1, 2014 and ending on March 18, 2014, the last day prior to the acquisition of Cadence by Mallinckrodt; (iii) Questcor for the period beginning on January 1, 2014 and ending August 14, 2014, the last day prior to the acquisition of Questcor by Mallinckrodt (“Questcor Period”), and (iv) Ikaria for the twelve months ended December 31, 2014 (“Ikaria LTM”). A total column combining (i), (ii), (iii) and (iv) is also presented.

The combined financial data presented below is not pro forma data and does not give effect to any adjustments as a result of (i) the pending Ikaria Acquisition, (ii) the acquisition of Questcor by Mallinckrodt, (iii) the acquisition of Cadence by Mallinckrodt, (iv) the related financings to fund the transactions and (v) the related tax effects from the transactions. As a result, the combined financial data presented below is not comparable to the pro forma data set forth under “—Summary Unaudited Pro Forma Combined Financial Data” and “Unaudited Pro Forma Combined Financial Information.”

Mallinckrodt LTM has been derived by adding the relevant line item from Mallinckrodt’s unaudited condensed consolidated statement of income for the three months ended December 26, 2014 to the same item from Mallinckrodt’s condensed consolidated and combined statement of income for the fiscal year ended September 26, 2014 and subtracting the same item from Mallinckrodt’s condensed consolidated and combined statement of income for the three months ended December 27, 2013, each of which is incorporated by reference into this offering circular.

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Questcor Period has been derived by adding the relevant line item from Questcor’s condensed consolidated statement of income for the six months ended June 30, 2014 to the same item from Questcor’s unaudited condensed consolidated statement of income for the period July 1, 2014 to August 14, 2014, which are not included in this offering circular.

Ikaria LTM has been derived by adding the relevant line item from Ikaria’s statement of operations for the predecessor period January 1, 2014 to February 11, 2014 to the same item from Target’s statement of operations for the year ended December 31, 2014.

The financial statements included in this offering circular with respect to the Issuers are the financial statements of Mallinckrodt plc, the ultimate parent of the Issuers, and not the financial statements of the Issuers themselves. The Issuers cannot assure you that the historical financial information as set forth in this offering circular will be indicative of their future financial performance or their ability to meet their obligations, including repayment of the notes. The unaudited condensed consolidating financial statements of Mallinckrodt for the three months ended December 26, 2014 and as of December 26, 2014 and September 26, 2014, and the unaudited condensed combined financial statements for the three months ended December 27, 2013, are included in Mallinckrodt’s Quarterly Report on Form 10-Q for the quarterly period ended December 26, 2014.

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The following table provides a reconciliation from Mallinckrodt plc’s net income (as reported) to EBITDA and Adjusted EBITDA:

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The following table provides a reconciliation from Cadence’s net income (as reported) to EBITDA and Adjusted EBITDA:

The following table provides a reconciliation from Questcor’s net income (as reported) to EBITDA and Adjusted EBITDA:

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The following table provides a reconciliation from Ikaria’s net income (loss) (as reported) to EBITDA and Adjusted EBITDA:

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