EXHIBIT 10.23

FIRST AMENDMENT

TO

ALLERGAN, INC.

PENSION PLAN

(RESTATED 2008)

The ALLERGAN, INC. PENSION PLAN (the “Plan”) is hereby amended as follows:

“Eligible Retirement Plan.    “Eligible Retirement Plan” shall mean (i) an individual retirement account or annuity described in Code Section 408(a) or 408(b) or a Roth IRA described in Code Section 408A(b), (ii) a qualified retirement plan described in Code Section 401(a) or 403(a) that accepts Eligible Rollover Distributions, (iii) an annuity contract described in Code Section 403(b) that accepts Eligible Rollover Distributions, and (iv) an eligible plan described in Code Section 457(b) which is maintained by a state, political subdivision of a state, or any agency or instrumentality of a state or political subdivision of a state and which agrees to separately account for amounts transferred into such plan from this Plan. Notwithstanding the foregoing, “Eligible Retirement Plan” shall refer only to (i) with respect to a Participant or Beneficiary who is a resident of Puerto Rico, a qualified retirement plan described in Code Section 401(a) or 403(a) that accepts Eligible Rollover Distributions and that is also a qualified plan under Puerto Rico Code Section 1165 and (ii) with respect to a non-spouse Beneficiary, an individual retirement account or annuity described in Code Section 408(a) or 408(b) or a Roth IRA described in Code Section 408A(b).”

“Qualified Joint and Survivor Annuity.    “Qualified Joint and Survivor Annuity” shall mean the form of pension benefit described in this Section. Under a Qualified Joint and Survivor Annuity, monthly payments to the Participant shall begin on the date provided in Article V and continue until the last day of the month in which the Participant’s death occurs. On the first day of the following month, monthly payments in an amount equal to 100% of the monthly payment to the Participant which is attributable to his or her Accrued Benefit shall begin to his or her surviving spouse but only if the spouse was married to the Participant on the date as of which payments to the Participant began. Payments to a surviving spouse under a Qualified Joint and Survivor Annuity shall end on the last day of the month in which the spouse’s death occurs. The anticipated payments under a Qualified Joint and Survivor Annuity shall be the actuarial equivalent of a pension in the form of a Single Life Annuity in the amount set forth in Article V.”

“(iv)    A benefit payable in a form other than a Single Life Annuity or Qualified Joint and Survivor Annuity described in subparagraph (iii) above shall be adjusted to the Actuarial Equivalent of a Straight Life Annuity before applying the limitations of this Section. Effective for Limitation Years commencing on or after January 1, 1995, Actuarial Equivalent for the form

of benefit shall be determined using (1) the interest rate and mortality table specified in Appendix A or (2) 5% interest rate (or for lump sums or other benefits subject to Code Section 417(e)(3), the applicable interest rate under Code Section 415(b)(2)(E)(ii) as determined as provided in Appendix A) and the applicable mortality table under Code Section 415(b)(2)(E)(v), whichever produces the greater Actuarial Equivalent value. Effective for Limitation Years commencing on or after January 1, 2006, the Actuarial Equivalent for any form of benefit not subject to Code Section 417(e)(3) shall be equal to the greater of (1) the annual amount of the Straight Life Annuity commencing at the same annuity starting date that has the same actuarial present value as the form of benefit payable to the Participant, computed using a 5% interest rate and the mortality table specified in Appendix A.2(a)(i) or (2) the annual amount of the Straight Life Annuity payable under the Plan commencing at the same annuity starting date as the form of benefit payable to the Participant. Effective for Limitation Years commencing on or after January 1, 2006, the Actuarial Equivalent for any form of benefit subject to Code Section 417(e)(3) shall be equal to the greatest of (1) the annual amount of the Straight Life Annuity commencing at the same annuity starting date that has the same Actuarial Equivalent present value as the form of benefit payable to the Participant; (2) the annual amount of the Straight Life Annuity commencing at the same annuity starting date that has the same actuarial present value as the form of benefit payable to the Participant, using a 5.5% interest rate assumption and the mortality table specified in Appendix A.2(a)(i); or (3) the annual amount of the Straight Life Annuity commencing at the same annuity starting date that has the same actuarial present value as the form of benefit payable to the Participant, computed using the interest rate and mortality table specified in Appendix A.2, divided by 1.05; provided, however, for distributions in Plan Years beginning in 2004 and 2005, the actuarially equivalent Straight Life Annuity for purposes of adjusting any benefit payable in a form to which Code Section 417(e)(3) applies shall be equal to the greater of (1) or (2) of this Subsection (iv).”

“(c)    “For limitation years beginning on or after January 1, 2002 and before January 1, 2008, the Defined Benefit Dollar Limitation for any Participant shall be adjusted as follows:”

“(e)    For Limitation Years beginning on or after January 1, 2008,

“Funding-Based Limits on Benefits.

“The Committee shall have the right to amend the Plan, subject to paragraphs (a) through (d) above, in accordance with the provisions of Section 9.6(f).”

“A.2    The Actuarial Equivalent of a Participant’s nonforfeitable Accrued Benefit payable in the form of a lump sum benefit shall, for purposes of Section 6.5, be determined as follows:

“The Actuarial Equivalent of a Participant’s pension payable in the form of a level income option under Section 6.4(iv) with an Annuity Starting Date on or after January 1, 2009, shall be the greater of the benefit determined using the interest and mortality factors set forth in Section A.1(a) or the benefit using the interest and mortality factors set forth Section A.2(a) of this Appendix A.”

IN WITNESS WHEREOF, Allergan, Inc. hereby executes this First Amendment to the Allergan, Inc. Pension Plan (Restated 2008) on this 12^th day of October, 2009.