Exhibit 10a.

EXECUTION VERSION

FIRST AMENDMENT TO CREDIT AGREEMENT

FIRST AMENDMENT (the “First Amendment”) dated as of June 21, 2013, to the FIVE
YEAR COMPETITIVE ADVANCE AND REVOLVING CREDIT FACILITY AGREEMENT (the “Credit
Agreement”) dated as of September 29, 2011, among BRISTOL-MYERS SQUIBB COMPANY,
a Delaware corporation (the “Company”), the BORROWING SUBSIDIARIES (as defined
in the Credit Agreement), the lenders party thereto (the “Lenders”), certain
Agents, JPMORGAN CHASE BANK, N.A., as Administrative Agent (in such capacity,
“JPMCB”), and CITIBANK, N.A., as Administrative Agent (in such capacity, “CBNA”;
JPMCB and CBNA are referred to herein individually as an “Administrative Agent”
and collectively as the “Administrative Agents”) and as competitive advance
facility agent.

W I T N E S S E T H:

WHEREAS, the Company has requested that certain provisions of the Credit
Agreement be amended as set forth herein;

NOW, THEREFORE, it is agreed:

SECTION 1.    Defined Terms

Capitalized terms used but not defined herein shall have the meaning assigned to
such terms in the Credit Agreement.

SECTION 2.    Amendment to the Credit Agreement

The Credit Agreement shall be amended as of the First Amendment Effective Date
(as defined below) as follows:

(a)    The recital to the Credit Agreement is hereby amended by deleting the
phrase “, including commercial paper backup and repurchase of shares.”

(b)    Section 2.5 (Extension of Maturity Date) of the Credit Agreement is
hereby amended by adding the following sentence at the end of Section 2.5(a):

Notwithstanding the foregoing, with respect to the anniversary of the Effective
Date occurring on September 29, 2013, the Borrower may submit an Extension
Letter on or prior to June 21, 2013 requesting an extension of the Maturity Date
to September 29, 2017 in lieu of submitting such Extension Request during the
period referred to above.

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SECTION 3.    Conditions to Effectiveness of the First Amendment

This First Amendment shall become effective on the date on which each of the
following conditions precedent have been satisfied or waived (the “First
Amendment Effective Date”):

(a)    CBNA (or its counsel) shall have received from the Company and the
Required Lenders either (i) a counterpart of this First Amendment signed on
behalf of such party or (ii) written evidence satisfactory to CBNA (which may
include email or telecopy transmission of a signed signature page of this First
Amendment) that such party has signed a counterpart of this First Amendment.

(b)    The Administrative Agents shall have received, to the extent invoiced not
less than two Business Days before the First Amendment Effective Date,
reimbursement or payment of all reasonable out-of-pocket expenses required to be
reimbursed or paid by the Company under Section 8.5 of the Credit Agreement.

CBNA shall notify the Company and the Lenders of the First Amendment Effective
Date, and such notice shall be conclusive and binding.

SECTION 4.    Effects on Loan Documents

This First Amendment shall constitute a “Loan Document” for purposes of the
Credit Agreement and the other Loan Documents. From and after the First
Amendment Effective Date, all references to the Credit Agreement and each of the
other Loan Documents shall be deemed to be references to the Credit Agreement as
amended by this First Amendment. Except as expressly amended by this First
Amendment, all of the representations, warranties, terms, covenants and
conditions of the Loan Documents shall remain unamended and not waived and shall
continue to be in full force and effect.

SECTION 5.    Miscellaneous

(a)    The Company represents and warrants to the Lenders and the Administrative
Agents that the representations and warranties set forth in Article III of the
Credit Agreement are true and correct in all material respects on the date
hereof, except to the extent such representations and warranties expressly
relate to an earlier date, in which case such representations and warranties
were true and correct as of such earlier date.

(b)    This Amendment may be executed in multiple counterparts, each of which
shall constitute an original but all of which taken together shall constitute
but one contract. A counterpart hereof, or signature page hereto, delivered to
the Administrative Agent by facsimile or e-mail shall be effective as delivery
of an original manually-signed counterpart.

(c)    The provisions of Sections 8.5, 8.11, 8.13 and 8.14 of the Credit
Agreement are incorporated herein by reference as if fully set forth herein,
mutatis mutandis.

SECTION 6.    Applicable Law

THIS FIRST AMENDMENT SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE
LAWS OF THE STATE OF NEW YORK.

[Signature pages follow]
 
IN WITNESS WHEREOF, the parties hereto have caused this First Amendment to be
duly executed by their respective authorized officers as of the day and year
first above written.

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BRISTOL-MYERS SQUIBB COMPANY
By: /s/ Jeffrey Galik  
Name: Jeffrey Galik
Title: Senior Vice President and Treasurer

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CITIBANK, N.A., as Administrative Agent and as a Lender
By: /s/ Maureen P. Maroney  
Name: Maureen P. Maroney
Title: Vice President

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JPMORGAN CHASE BANK, N.A., as Administrative Agent and as a Lender
By: /s/ William Clark  
Name: William Clark
Title: Managing Director

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BANK OF AMERICA, N.A.

By: /s/ Robert LaPorte  
Name: Robert LaPorte
Title: Vice President

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BNP Paribas
By: /s/ Michael Hoffman  
Name: Michael Hoffman
Title: Vice President

By: /s/ Andrea Sanger  
Name: Andrea Sanger
Title: Vice President

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ROYAL BANK OF SCOTLAND PLC
By: /s/ William McGinty  
Name: William McGinty
Title: Director

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BARCLAYS BANK PLC, as a lender
By: /s/ Alicia Borys
Name: Alicia Borys
Title: Vice President

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DEUTSCHE BANK AG NEW YORK BRANCH
By: /s/ Ming K. Chu
Name: Ming K. Chu
Title: Vice President

By: /s/ Virginia Cosenza
Name: Ming K. Chu
Title: Vice President

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CREDIT SUISSE AG, CAYMAN ISLANDS BRANCH
By: /s/ Mikhail Faybusovich
Name: Mikhail Faybusovich
Title: Authorized Signatory

By: /s/ Tyler R. Smith
Name: Tyler R. Smith
Title: Authorized Signatory

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Goldman Sachs Bank USA
By: /s/ Mark Walton
Name: Mark Walton
Title: Authorized Signatory

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MORGAN STANLEY BANK, N.A.
By: /s/ Kelly Chin
Name: Kelly Chin
Title: Authorized Signatory

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The Bank of Tokyo-Mitsubishi UFJ. Ltd.
By: /s/ Jaime Sussman
Name: Jaime Sussman
Title: VP

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HSBC Bank USA, National Association
By: /s/ Thomas A. Foley
Name: Thomas A. Foley
Title: Managing Director

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Wells Fargo Bank, N.A.
By: /s/ Monique Gasque
Name: Monique Gasque
Title: Vice President

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THE BANK OF NEW YORK MELLON
By: /s/ Clifford A. Mull
Name: Clifford A. Mull
Title: First Vice President

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THE NORTHERN TRUST COMPANY
By: /s/ Dan Boote
Name: Dan Boote
Title: Senior Vice President

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SOVEREIGN BANK, N.A.
By: /s/ William Maag
Name: William Maag
Title: Senior Vice President