FOURTH SUPPLEMENTAL INDENTURE

Exhibit 4.3

FOURTH SUPPLEMENTAL INDENTURE

FOURTH SUPPLEMENTAL INDENTURE, dated as of July 3, 2012 (the "Fourth Supplemental Indenture"), by and among Valeant Pharmaceuticals Holdings (Barbados) SRL, Valeant International Bermuda, Valeant Laboratories International Bermuda, Valeant Pharmaceuticals Holdings Bermuda, Valeant Pharmaceuticals Nominee Bermuda, Valeant Pharmaceuticals Luxembourg S.à.x.x., Valeant Pharmaceuticals Ireland (collectively, the “New Guarantors”), Valeant Pharmaceuticals International, a Delaware corporation (the "Company"), and The Bank of New York Mellon Trust Company, N.A., a national banking association, as trustee (the "Trustee").

WHEREAS, each of the Company, Valeant Pharmaceuticals International, Inc. ("Parent"), the indirect parent of the Company, and the Subsidiary Guarantors (as defined in the Indenture referred to below) has heretofore executed and delivered to the Trustee an Indenture, dated as of November 23, 2010 (the "Indenture"), providing for the issuance of 6.875% Senior Notes due 2018 (the "Securities");

WHEREAS, each New Guarantor desires to provide a full and unconditional guarantee (the "Guarantee") of the obligations of the Company under the Securities and the Indenture on the terms and conditions set forth herein;

WHEREAS, pursuant to Section 9.1 of the Indenture, the Company, the Trustee and the New Guarantors are authorized to execute and deliver this Fourth Supplemental Indenture; and

WHEREAS, the Company has complied with all conditions precedent provided for in the Indenture relating to the Fourth 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 hereto mutually covenant and agree for the equal and ratable benefit of the Holders as follows:

1.    Definitions. Capitalized terms used but not defined herein have the meanings ascribed to such terms in the Indenture.

2.    Guarantee. Each of the New Guarantors hereby agrees to provide a full and unconditional guarantee on the terms and subject to the conditions set forth in the Note Guarantee and in the Indenture including, but not limited to, Article 10 thereof.

3.    Effectiveness of Fourth Supplemental Indenture. This Fourth Supplemental Indenture shall become effective upon the execution and delivery of this Fourth Supplemental Indenture by the Company, each New Guarantor and the Trustee.

4.    Indenture Remains in Full Force and Effect. This Fourth Supplemental Indenture shall form a part of the Indenture for all purposes and, except as supplemented or amended hereby, all other provisions in the Indenture and the Securities, to the extent not inconsistent with the terms and provisions of this Fourth Supplemental Indenture, shall remain in full force and effect.

5.    No Recourse Against Others. No stockholder, officer, director or incorporator, as such, past, present or future of any New Guarantor shall have any personal liability under this Guarantee, the Securities, the Indenture or this Fourth Supplemental Indenture by reason of his, her or its status as

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such stockholder, officer, director or incorporator.

6.    Headings. The headings of the Articles and Sections of this Fourth Supplemental Indenture are inserted for convenience of reference and shall not be deemed a part thereof.

7.    Counterparts. This Fourth Supplemental Indenture may be executed in any number of counterparts, each of which so executed shall be deemed to be an original, but all such counterparts shall together constitute but one and the same instrument.

8.    Governing Law. This Fourth Supplemental Indenture shall be governed by, and construed in accordance with, the laws of the State of New York, without regard to principles of conflicts of laws.

9.    Agent for Service. Each New Guarantor hereby appoints CT Corporation as its authorized agent upon whom process may be served in any suit or proceeding arising out of or relating to the Indenture, the Securities or this Fourth Supplemental Indenture that may be instituted in any federal or state court in the State of New York or brought under federal or state securities laws.

10.    Trustee Disclaimer. The Trustee is not responsible for the validity or sufficiency of this Fourth Supplemental Indenture nor for the recitals herein.

[Intentionally Left Blank]

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IN WITNESS WHEREOF, the parties hereto have caused this Fourth Supplemental Indenture to be duly executed as of the day and year first written above.

Company:	VALEANT PHARMACEUTICALS INTERNATIONAL
	By:	/s/ Xxxxx Xx Xxxxx
		Name:	Xxxxx Xx Xxxxx
		Title:	President and Chief Operating Officer

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New Guarantors:	VALEANT PHARMACEUTICALS HOLDINGS (BARBADOS) SRL
	By:	/s/ Xxxxxxxx Xxxxxx
		Name:	Xxxxxxxx Xxxxxx
		Title:	Manager and Assistant Secretary
	By:	/s/ Xxxx Xxxxxxxxx
		Name:	Xxxx Xxxxxxxxx
		Title:	Manager

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	XXXXXXX XXXXXXXXXXXXXXX XXXXXXXXXX S.à.x.x.
	By:	/s/ Xxxxx Xxxxx
		Name:	Xxxxx Xxxxx
		Title:	Manager
	By:	/s/ Xxx Xx Ang
		Name:	Xxx Xx Ang
		Title:	Manager

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	GIVEN UNDER THE COMMON SEAL OF VALEANT PHARMACEUTICALS IRELAND and DELIVERED as a DEED in the presence of
		/s/ Xxxxxx Xxxxxxx
		Name:	Xxxxxx Xxxxxxx
		Title:	Director and General Manager
		/s/ Xxxxxxx Xxxxxxx
		Name:	Xxxxxxx Xxxxxxx
		Title:	Director

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	VALEANT INTERNATIONAL BERMUDA
	By:	/s/ Xxxxx XxXxxxx
		Name:	Xxxxx XxXxxxx
		Title:	Director, President and Assistant Secretary
	By:	/s/ Xxxxx Xxxxx
		Name:	Xxxxx Xxxxx
		Title:	Director

	VALEANT LABORATORIES INTERNATIONAL BERMUDA
	By:	/s/ Xxxxx XxXxxxx
		Name:	Xxxxx XxXxxxx
		Title:	Director, President and Assistant Secretary
	By:	/s/ Xxxxx Xxxxx
		Name:	Xxxxx Xxxxx
		Title:	Director

	VALEANT PHARMACEUTICALS HOLDINGS BERMUDA
	By:	/s/ Xxxxx XxXxxxx
		Name:	Xxxxx XxXxxxx
		Title:	Director, President and Assistant Secretary
	By:	/s/ Xxxxx Xxxxx
		Name:	Xxxxx Xxxxx
		Title:	Director

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	VALEANT PHARMACEUTICALS NOMINEE BERMUDA
	By:	/s/ Xxxxx XxXxxxx
		Name:	Xxxxx XxXxxxx
		Title:	Director, President and Assistant Secretary
	By:	/s/ Xxxxx Xxxxx
		Name:	Xxxxx Xxxxx
		Title:	Director

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Trustee:	THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. as Trustee
	By:	/s/ Xxxxxxx Xxxxx
		Name:	Xxxxxxx Xxxxx
		Title:	Authorized Signatory

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