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                                                                     EXHIBIT 3.1

                    FIRST AMENDMENT TO ALLERGAN, INC. BYLAWS

The ALLERGAN, INC. BYLAWS (the "Bylaws") are hereby amended as follows:

1.      Article II, Section 6 of the Bylaws is amended in its entirety as
        follows:

               SECTION 6. Voting.

                Each stockholder shall, at each meeting of stockholders, be
        entitled to vote in person or by proxy each share of the stock of the
        Corporation that has voting rights on the matter in question and that
        shall have been held by such stockholder and registered in such
        stockholder's name on the books of the Corporation:

                    (A) on the date fixed pursuant to Article VI, Section 5 of
                these Bylaws as the record date for the determination of
                stockholders entitled to notice of and to vote at such meeting;
                or

                    (B) if no such record date shall have been so fixed, then
                (i) at the close of business on the day next preceding the day
                upon which notice of the meeting shall be given or (ii) if
                notice of the meeting shall be waived, at the close of business
                on the day next preceding the day upon which the meeting shall
                be held.

                Shares of its own stock belonging to the Corporation or to
        another corporation, if a majority of the shares entitled to vote in the
        election of directors in such other corporation is held, directly or
        indirectly, by the Corporation, shall neither be entitled to vote nor be
        counted for quorum purposes. Persons holding stock of the Corporation in
        a fiduciary capacity shall be entitled to vote such stock. Person whose
        stock is pledged shall be entitled to vote, unless in the transfer by
        the pledgor on the books of the Corporation the pledgor shall have
        expressly empowered the pledgee to vote thereon, in which case only the
        pledgee, or the pledgee's proxy, may represent such stock and vote
        thereon. Stock having voting power standing of record in the names of
        two or more persons, whether fiduciaries, members of a partnership,
        joint tenants, tenants in common, tenants by the entirety or otherwise,
        or with respect to which two or more persons have the same fiduciary
        relationship, shall be voted in accordance with the provisions of the
        Delaware General Corporation Law.

                Any such voting rights may be exercised by the stockholder
        entitled thereto in person or by such stockholder's proxy appointed by
        an instrument in writing (or in such manner prescribed by the Delaware
        General Corporation Law), by such stockholder or by such stockholder's
        attorney thereunto authorized and delivered to the secretary of the
        meeting; provided, however, that no proxy shall


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        be voted or acted upon after three years from its date unless said proxy
        shall provide for a longer period. The attendance at any meeting of a
        stockholder who may theretofore have given a proxy shall not have the
        effect of revoking the same unless such stockholder shall in writing so
        notify the secretary of the meeting prior to the voting of the proxy. At
        any meeting of stockholders, all matters, except as otherwise provided
        in the Restated Certificate of Incorporation, in these Bylaws or by law,
        shall be decided by the vote of a majority in voting interest of the
        stockholders present in person or by proxy and entitled to vote thereat
        and thereon, a quorum being present. The vote at any meeting of
        stockholders on any question need not be by ballot, unless so directed
        by the chairman of the meeting. On a vote by ballot, each ballot shall
        be signed by the stockholder voting, or by such stockholder's proxy, if
        there be such proxy, and it shall state the number of shares voted.

2.      The effective date of this First Amendment shall be September 20, 1999.

IN WITNESS WHEREOF, Allergan, Inc. hereby executes this First Amendment on the
29th day of October, 1999.


ALLERGAN, INC.

By:  /s/ Francis R. Tunney, Jr.
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     Francis R. Tunney, Jr.,
     Corporate Vice President--Administration,
     General Counsel and Secretary