Prospectus Supplement No. 1
 

Filed Pursuant to Rule 424(b)(3)
Registration No. 333-102425

PROSPECTUS SUPPLEMENT NO. 1
(TO PROSPECTUS DATED JANUARY 17, 2003)

$641,510,000
ALLERGAN, INC.

ZERO COUPON CONVERTIBLE SENIOR NOTES DUE 2022
SHARES OF COMMON STOCK ISSUABLE UPON CONVERSION OF THE NOTES

          This Prospectus Supplement No. 1 supplements and amends the Prospectus dated January 17, 2003, (as amended, the “Prospectus”), relating to the resale from time to time by holders of our Zero Coupon Convertible Senior Notes Due 2022 and shares of our common stock issuable upon the conversion of the Notes. Such information has been obtained from the selling securityholders. This prospectus supplement should be read in conjunction with the Prospectus, which is to be delivered with this prospectus supplement.

          The information appearing in the table below, as of the date hereof, supplements and amends the information in the table appearing under the heading “Selling Securityholders” in the Prospectus, and, where the name of a Selling Securityholder identified in the table below also appears in the table in the Prospectus, the information set forth in the table below regarding that Selling Securityholder supercedes the information in the Prospectus:

                                 
    PRINCIPAL                        
    AMOUNT OF                        
    NOTES                        
    BENEFICIALLY           COMMON   COMMON
    OWNED AND   PERCENTAGE   STOCK OWNED   STOCK
    OFFERED HEREBY   OF NOTES   PRIOR TO THE   OFFERED
NAME   (1)   OUTSTANDING   OFFERING   HEREBY (1)
 
 
 
 
AM Investment D Fund I, LP
   $ 3,600,000       *               41,076  
AM Investment D Fund, Ltd.
     19,500,000       3.04 %             222,495  
Amerisure Mutual Insurance Company
     240,000       *               2,738  
BBT Fund, L.P.
     12,000,000       1.87 %             136,920  
Chrysler Corporation Master Retirement Fund
     6,960,000       1.08 %             79,413  
Concentrated Alpha Partners, L.P.
     6,000,000       *               68,460  
DBAG London
     15,500,000       2.42 %             176,855  
Delta Air Lines Master Trust (c/o Oak Tree Capital Management, LLC)
     1,630,000       *               18,598  
Delta Pilots D & S Trust (c/o Oak Tree Capital Management, LLC)
     960,000       *               10,953  
Deutsche Bank Securities Inc.
     39,667,000       6.18 %             452,600  
Innovest Finanzdienstle
     1,400,000       *               15,974  
Lyxor/AM Investment Fund, Ltd.
     3,000,000       *               34,230  
Medamerica Insurance Company
     1,200,000       *               13,692  
Medamerica Insurance Company of N.Y
     200,000       *               2,282  
Merrill Lynch Pierce Fenner & Smith Inc.
     15,750,000       2.46 %             179,707  
Met Investors Bond Debenture Fund
     1,000,000       *               11,410  
Microsoft Corporation
     2,635,000       *               30,065  
Motion Picture Industry Health Plan – Active Member Fund
     475,000       *               5,419  
Motion Picture Industry Health Plan – Retiree Member Fund
     295,000       *               3,365  
NACM Investment Grade Convertible Fund
     10,000       *               114  
NMS Services (Cayman) Inc.
     10,000,000       1.56 %             114,100  

 

 

                                 
    PRINCIPAL                        
    AMOUNT OF                        
    NOTES                        
    BENEFICIALLY           COMMON   COMMON
    OWNED AND   PERCENTAGE   STOCK OWNED   STOCK
    OFFERED HEREBY   OF NOTES   PRIOR TO THE   OFFERED
NAME   (1)   OUTSTANDING   OFFERING   HEREBY (1)
 
 
 
 
OCM Convertible Trust
     4,730,000       *               53,969  
Partner Reinsurance Company Ltd.
     1,525,000       *               17,400  
Qwest Occupational Health Trust
     550,000       *               6,275  
Radian Asset Guaranty
     1,750,000       *               19,967  
Radian Guaranty
     2,150,000       *               24,531  
S.A.C. Capital Associates, LLC
     5,000,000       *               57,050  
State Employees’ Retirement Fund of the State of Delaware
     2,020,000       *               23,048  
Vanguard Convertible Securities Fund, Inc.
     9,720,000       1.52 %             110,905  

*Less than one percent.

(1)  The number of shares of common stock owned prior to the offering includes shares of common stock into which the notes are convertible. The number of shares of common stock offered hereby is based on a conversion rate of 11.410 shares of common stock per $1,000 principal amount of maturity of the notes. Information concerning other Selling Securityholders will be set forth in prospectus supplements from time to time, if required. The number of shares of common stock owned by the other Selling Securityholders or any future transferee from any such holder assumes that they do not beneficially own any common stock other than common stock into which the notes are convertible at a conversion rate of 11.410 shares of common stock per $1,000 principal amount of maturity of the notes.

          INVESTING IN THE NOTES OR THE COMMON STOCK ISSUABLE UPON CONVERSION OF THE NOTES INVOLVES A HIGH DEGREE OF RISK. PLEASE CONSIDER THE “RISK FACTORS” BEGINNING ON PAGE 7 OF THE PROSPECTUS.

          NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THE PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

The date of this prospectus supplement is January 24, 2003.