SECOND SUPPLEMENTAL INDENTURE

EXHIBIT 4.6

SECOND SUPPLEMENTAL INDENTURE

Second Supplemental Indenture (this “Supplemental Indenture”), dated as of February 20, 2014, among each of the undersigned (each a “Guaranteeing Subsidiary” and, collectively, the “Guaranteeing Subsidiaries”), each a subsidiary of Par Pharmaceutical Companies, Inc. a Delaware corporation (the “Company”), and Xxxxx Fargo Bank, National Association, a national banking association, as trustee (the “Trustee”).

W I T N E S S E T H

WHEREAS, Sky Growth Acquisition Corporation (“Sky”) has heretofore executed and delivered to the Trustee an Indenture (as supplemented and/or otherwise modified from time to time, the “Indenture”), dated as of September 28, 2012, providing for the issuance of an unlimited aggregate principal amount of 7⅜% Senior Notes due 2020 (the “Notes”);

WHEREAS, the Indenture provides that under certain circumstances each Guaranteeing Subsidiary shall execute and deliver to the Trustee a supplemental indenture pursuant to which such Guaranteeing Subsidiary shall unconditionally guarantee all of the Issuer’s Obligations under the Notes and the Indenture on the terms and conditions set forth herein and under the Indenture (the “Guarantee”); and

WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is authorized to execute and deliver this Supplemental Indenture.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties mutually covenant and agree for the equal and ratable benefit of the Holders as follows:

(1)    Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture.

(2)    Agreement to Guarantee. Each of the Guaranteeing Subsidiaries hereby agree to provide an unconditional Guarantee on the terms and subject to the conditions set forth in the Indenture including, but not limited to, Article X thereof.

(3)    No Recourse Against Others. No past, present or future director, officer, employee, incorporator, member, partner or stockholder of the Issuer or any Guarantor or any of their parent companies or subsidiaries (other than the Issuer and the Guarantors) shall have any liability for any obligations of the Issuer or the Guarantors under the Notes, the Guarantees, the Indenture or this Supplemental Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder by accepting Notes waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Notes.

(4)    Governing Law. THIS SUPPLEMENTAL INDENTURE WILL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

(5)    Counterparts. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. This Supplemental Indenture may be executed in multiple counterparts, which, when taken together, shall constitute one instrument. The exchange of copies of this Supplemental Indenture and of signature pages by facsimile or PDF transmissions shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes.

(6)    Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction hereof.

(7)    The Trustee. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made by each of the Guaranteeing Subsidiaries.

(8)    Successors. All agreements of the Guaranteeing Subsidiaries in this Supplemental Indenture shall bind its Successors, except as otherwise provided in this Supplemental Indenture. All agreements of the Trustee in this Supplemental Indenture shall bind its successors.

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IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed, all as of the date first above written.

JHP ACQUISITION, LLC

JHP PHARMACEUTICALS, LLC

JHP GROUP HOLDINGS, INC.

By:    /s/ Xxxxxxx X. Xxxxxxxx         Name: Xxxxxxx X. Xxxxxxxx     Title: Executive Vice President and

Chief Financial Officer

XXXXX FARGO BANK, NATIONAL ASSOCIATION, as Trustee

By:    /s/ Xxxxxx Xxxx         Name: Xxxxxx Xxxx     Title: Vice Presidnet

By:    /s/ Xxxx Xxxxxxxx         Name: Xxxx Xxxxxxxx     Title: Vice President

[Signature Page to Second Supplemental Indenture]