ALKERMES INC
424B3, 1999-08-17
PHARMACEUTICAL PREPARATIONS
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<PAGE>   1
Prospectus Supplement No. 11
to Prospectus dated April 27, 1998



                                 ALKERMES, INC.
       2,300,000 SHARES OF $3.25 CONVERTIBLE EXCHANGEABLE PREFERRED STOCK
             $115,000,000 6 1/2% CONVERTIBLE SUBORDINATED DEBENTURES
                        3,881,940 SHARES OF COMMON STOCK

         This Prospectus Supplement supplements information contained in that
certain Prospectus of Alkermes, Inc. (the "Company") dated April 27, 1998 (the
"Prospectus") relating to the potential resale from time to time of $3.25
Convertible Exchangeable Preferred Stock, par value $.01 per share (the
"Preferred Stock"), 6 1/2% Convertible Subordinated Debentures (if issued) (the
"Debentures") and Common Stock (the "Common Stock") issuable upon conversion of
the Preferred Stock or Debentures (if issued). This Prospectus Supplement is not
complete without, and may not be delivered or utilized except in connection
with, the Prospectus, including any amendments or supplements thereto.
Capitalized terms used herein but not defined have the meanings assigned to such
terms in the Prospectus.

         The following table supplements the information set forth in the
Prospectus under the caption "Selling Shareholders" with respect to the Selling
Shareholders and the respective amount of shares of Preferred Stock beneficially
owned by each Selling Shareholder and that may be sold, the principal amount of
Debentures which would be beneficially owned and may be sold by each Selling
Shareholder, and number of shares of Common Stock that may be sold by the
Selling Shareholders pursuant to this Prospectus, as amended or supplemented:

<TABLE>
<CAPTION>

                                         NUMBER OF
                                         SHARES OF                                 PRINCIPAL
                                         PREFERRED                                 AMOUNT OF
                                           STOCK                                  DEBENTURES           NUMBER OF
                                        BENEFICIALLY         PERCENT OF           BENEFICIALLY        CONVERSION
                                         OWNED AND          OUTSTANDING            OWNED AND            SHARES
                                         THAT MAY            PREFERRED             THAT MAY            THAT MAY
NAME (1)                                  BE SOLD              STOCK                BE SOLD           BE SOLD (2)
- --------                               ------------         -------------         ------------        -----------
<S>                                       <C>                   <C>                <C>                  <C>
Deutsche Bank Securities, Inc.            105,000               2.7%               $5,250,000           177,219

</TABLE>

(1)   The information set forth herein is as of August 12, 1999 and will be
      updated as required.
(2)   Assumes conversion of the full amount of Preferred Stock held by such
      holder at the initial conversion rate of 1.6878 shares of Common Stock
      for each share of Preferred Stock.


            THE DATE OF THIS PROSPECTUS SUPPLEMENT IS AUGUST 17, 1999








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