OMNICARE INC
424B3, 1998-08-27
DRUG STORES AND PROPRIETARY STORES
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<PAGE>   1
                                                Filed Pursuant to Rule 424(b)(3)
                                                              File No. 333-45825

PROSPECTUS SUPPLEMENT NO. 15
(To Prospectus dated February 13, 1998,
as Supplemented)


                                 OMNICARE, INC.
                 $345,000,000 PRINCIPAL AMOUNT OF 5% CONVERTIBLE
                        SUBORDINATED DEBENTURES DUE 2007
                    (Interest payable June 1 and December 1)
                    ----------------------------------------

                        8,976,222 SHARES OF COMMON STOCK
                        --------------------------------

         This Prospectus Supplement supplements the Prospectus dated February
13, 1998 and the Prospectus Supplements Nos. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12, 13 and 14 dated February 26, 1998, March 6, 1998, April 1, 1998, April 17,
1998, April 27, 1998, May 5, 1998, May 15, 1998, May 27, 1998, June 12, 1998,
June 29, 1998, July 13, 1998, July 16, 1998, August 6, 1998 and August 18, 1998,
respectively (together, the "Prospectus"), relating to (i) $345,000,000
aggregate principal amount of 5% Convertible Subordinated Debentures due 2007
(the "Debentures") of Omnicare, Inc., a Delaware corporation (the "Company"),
(ii) 8,712,121 shares of common stock, par value $1.00 per share (the "Common
Stock"), of the Company which are initially issuable upon conversion of the
Debentures plus such additional indeterminate number of shares of Common Stock
as may become issuable upon conversion of the Debentures as a result of
adjustments to the conversion price (the "Conversion Shares") and (iii) 264,101
additional shares of Common Stock. The Debentures and the Conversion Shares are
being offered for the account of the holders thereof or by their transferees,
pledgees, donees or successors. The Debentures were initially acquired from the
Company by Morgan Stanley & Co. Incorporated, Credit Suisse First Boston
Corporation, Merrill Lynch, Pierce, Fenner & Smith Incorporated, NationsBanc
Montgomery Securities, Inc., Smith Barney Inc. and William Blair & Company,
L.L.C. in December 1997 in connection with a private offering. This Prospectus
Supplement is not complete without, and may not be delivered or utilized except
in connection with, the Prospectus. Capitalized terms used herein but not
defined shall have the meaning assigned to such terms in the Prospectus.

         The Common Stock is traded on the NYSE under the symbol "OCR." On
August 25, 1998 the closing price of the Common Stock on the NYSE Composite Tape
was $36.3125.

         The following table sets forth certain information concerning Baptist
Health, Boston Museum of Fine Arts, Dunham & Associates Fund II, Dunham &
Associates Fund III, Engineers Joint Pension Fund, Nicholas Applegate Income &
Growth, San Diego City Employees, San Diego County and Wake Forest University
(the "Selling Securityholders") who have provided the Company with notice as of
the date of this Prospectus Supplement pursuant to the Registration Rights
Agreement of such Selling Securityholders' intent to sell or otherwise dispose
of Debentures and/or Conversion Shares pursuant to the Registration Statement.
This information supplements the information contained in the Prospectus under
the caption 
<PAGE>   2

"Selling Securityholders." Neither the Selling Securityholders nor any of their
affiliates have held any position or office with, been employed by or otherwise
have had any material relationship with, the Company or any of its affiliates
during the three years prior to the date of this Prospectus Supplement. Because
the Selling Securityholders may offer all or some portion of the Debentures and
Conversion Shares, no estimate can be given as to the percentage of Debentures
or Common Stock that will be held by the Selling Securityholders upon
termination of sales pursuant to this Prospectus Supplement.

<TABLE>
<CAPTION>

                                Principal Amount    Percentage of Debentures                             Percentage of Common
                                  of Debentures     Outstanding Beneficially      Conversion Shares       Stock Beneficially
            Name                that May be Sold      Owned Before Offering       That May Be Sold**     Owned Before Offering
            ----                ----------------      ---------------------       ------------------     ---------------------

<S>                                   <C>                      <C>                       <C>                      <C>
Baptist Health                        $  129,000               *                         3,257                    *

Boston Museum of Fine Arts                55,000               *                         1,388                    *

Dunham & Associates Fund II               39,000               *                           984                    *

Dunham & Associates Fund III              20,000               *                           505                    *

Engineers Joint Pension Fund             203,000               *                         5,126                    *

Nicholas Applegate Income &
Growth                                 1,910,000               *                        48,232                    *

San Diego City Employees                 548,000               *                        13,838                    *

San Diego County                       1,684,000               *                        42,525                    *

Wake Forest University                   412,000               *                        10,404                    *
</TABLE>


- ----------------

*       Less than 1%.
**      Assumes conversion of full amount of Debentures held by such holder at
        the initial rate of $39.60 in principal amount of Debentures per share
        of Common Stock.


           The date of this Prospectus Supplement is August 27, 1998.

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