UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 15)*

                               Biovail Corporation
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                                (Name of Issuer)

                           Common Stock, no par value
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                         (Title of Class of Securities)

                                    09067K106
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                                 (CUSIP Number)

                                  Eugene Melnyk
                               Biovail Corporation
                              7150 Mississauga Road
                           Mississauga, Ontario L5N8M5
                                     Canada
                                 (905) 286-3000
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(Name, Address and Telephone Number of Person Authorized to Receive Notices and
                                Communications)

                                January 14, 2004
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             (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

Note: An EDGAR version of this statement, including all exhibits, should be
filed with the Commission. See Rule 13d-1(a) for other parties to whom copies
are to be sent.

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                                  SCHEDULE 13D

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CUSIP No. 09067K106
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1     NAME OF REPORTING PERSON
      S.S. OR I.R.S. IDENTIFICATION NO.  OF ABOVE PERSON

                Eugene Melnyk
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2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
      (a) [ ]

                                                                         (b) [ ]
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3     SEC USE ONLY

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4     SOURCE OF FUNDS

                PF
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5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
      2(d) or 2(e) [ ]

                N/A
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6     CITIZENSHIP OR PLACE OF ORGANIZATION

                Canada
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                      7      SOLE VOTING POWER

                                   24,108,920
                   -------------------------------------------------------------
     NUMBER OF        8      SHARED VOTING POWER
       SHARES
    BENEFICIALLY                   190,496
      OWNED BY     -------------------------------------------------------------
        EACH          9      SOLE DISPOSITIVE POWER
     REPORTING
       PERSON                      24,108,920
        WITH       -------------------------------------------------------------
                      10     SHARED DISPOSITIVE POWER

                                   190,496
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11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                24,299,416
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12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ]

                N/A
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13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                15.4%
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14       TYPE OF REPORTING PERSON*

                IN
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                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
             (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE
                                  ATTESTATION.

      This Amendment No. 15 amends and supplements the statement on Schedule 13D
filed with the Securities and Exchange Commission (the "SEC") on March 30, 1994,
as amended by Amendment No. 1 thereto filed with the SEC on April 11, 1995,
Amendment No. 2 thereto filed with the SEC on September 25, 1996, Amendment No.
3 thereto filed with the SEC on March 11, 1997, Amendment No. 4 thereto filed
with the SEC on May 6, 1997, Amendment No. 5 thereto filed with the SEC on
January 13, 1998, Amendment No. 6 thereto filed with the SEC on March 26, 1998,
Amendment No. 7 thereto filed with the SEC on September 28, 2001, Amendment No.
8 thereto filed with the SEC on January 15, 2002, Amendment No.9 thereto
relating to the event date of February 1, 2002, Amendment No.10 thereto relating
to the event date of May 8, 2002, Amendment No. 11 thereto relating to the event
date of November 28, 2002, Amendment No. 12 thereto relating to the event date
of August 6, 2003, Amendment No. 13 thereto relating to the event date of
November 7, 2003 and Amendment No. 14 thereto relating to the event date of
December 9, 2003 (as so amended, the "Schedule 13D"), with respect to the common
stock, no par value (the "Common Stock"), of Biovail Corporation (the
"Company"). Except as amended by this Amendment No. 15, the Schedule 13D, as
heretofore filed with the SEC, shall remain in full force and effect.

ITEM 1.     SECURITY AND ISSUER.

            This amendment relates to the Common Stock of the Company.

ITEM 2.     IDENTITY AND BACKGROUND.

            This amendment is being filed by Eugene Melnyk, the Chairman of the
Board and a director of the Company. The filing of this amendment shall not be
construed as an admission that Mr. Melnyk is, for purposes of Section 13(d) or
13(g) of the Securities Exchange Act of 1934, as amended, the beneficial owner
of any securities reported on herein except for the securities stated herein to
be beneficially owned by Mr. Melnyk.

ITEM 3.     SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

            See Schedule A for a description of Mr. Melnyk's transactions in the
Common Stock since the filing of Amendment No. 14. Unless otherwise noted, all
such transactions are sales effected in the open market.

ITEM 4.     PURPOSE OF TRANSACTION.

            Mr. Melnyk's acquisition of the securities of the Company was for
the purpose of investment. However, Mr. Melnyk retains his right to acquire
shares of Common Stock and to dispose of shares of Common Stock. In determining
whether to purchase or dispose of shares of Common Stock, Mr. Melnyk intends to
consider and review various factors on a continuous basis, including the
Company's financial condition, business and prospects, other developments
concerning the Company, the price and availability of shares of Common Stock,
other investment and business opportunities available to Mr. Melnyk, and
developments with respect to general economic, monetary and stock market
conditions.

            Except as otherwise described herein, Mr. Melnyk has no plan or
proposal with respect to the Company which relates to or would result in any of
the matters listed in Items 4(a) - (j) of Schedule 13D. However, in addition to
the rights reserved above, the Mr. Melnyk retains his rights to modify his plans
with respect to the transactions described in this Item 4, to acquire

or dispose of securities of the Company and to formulate plans and proposals
which could result in the occurrence of any such events, subject to applicable
laws and regulations.

ITEM 5.     INTEREST IN SECURITIES OF THE ISSUER.

            (a)   As of January 23, 2004, Mr. Melnyk may be deemed to be the
beneficial owner of 24,299,416 shares of Common Stock (including 22,811,220
shares that are owned directly by Mr. Melnyk, 95,100 shares held by the Eugene
Melnyk Registered Retirement Savings Plan, 190,496 shares held by Laura Melnyk
(Mr. Melnyk's wife), and 1,202,600 shares which are subject to options
exercisable within 60 days held by Mr. Melnyk), which constitute in the
aggregate 15.4% of the shares of Common Stock outstanding. In addition, Mr.
Melnyk owns options to purchase 625,100 shares of Common Stock which are not
exercisable within 60 days of the date of this amendment.

            Except as described in the preceding paragraph, Mr. Melnyk does not
beneficially own any shares of Common Stock.

            (b)   Except as set forth in the next sentence, Mr. Melnyk has the
sole power to vote, direct the voting of, dispose of and direct the disposition
of the Common Stock beneficially owned by him. Mr. Melnyk shares with Laura
Melnyk (his wife) the power to vote, direct the voting of, dispose of and direct
the disposition of the Common Stock beneficially held by her.

            (c)   See Schedule A for a description of Mr. Melnyk's transactions
                  in the Common Stock since the filing of Amendment No. 14.
                  Unless otherwise noted, all such transactions are sales
                  effected in the open market.

            (d)   Except as set forth in Item 5(b) or in the succeeding
sentence, Mr. Melnyk has the sole right to receive or the power to direct the
receipt of dividends from, or the proceeds from the sale of, the Common Stock
owned by him. Certain of the shares of Common Stock have been pledged to a bank
to secure lines of credit of up to US$7 million and up to C$10 million,
respectively. Both of these credit facilities are available to Mr. Melnyk.
Certain of the shares of Common Stock from time to time may be held in one or
more securities accounts, the securities in which secure margin debt.

            (e)   Not applicable.

ITEM 6.     CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR
            RELATIONSHIPS WITH RESPECT TO SECURITIES OF THE ISSUER.

            See Section 5(d).

ITEM 7.     MATERIAL TO BE FILED AS EXHIBITS.

            Not applicable.

                                    SIGNATURE

            After reasonable inquiry and to the best of my knowledge and belief,
I certify that the information set forth in this statement is true, complete and
correct.

January 23, 2004

                                            /s/ Eugene Melnyk
                                            -----------------
                                            Eugene Melnyk

                                   Schedule A

      Transactions in the Common Stock since the filing of Amendment No. 14



                               Number of Shares
  Date and Type                of Common Stock                 Price Per Share
  -------------                ---------------                 ---------------
                                                         
January 13, 2004                   7,800                          US $22.66
January 13, 2004                   5,200                          US $22.67
January 13, 2004                  17,000                          US $22.70
January 13, 2004                  12,000                          US $22.65
January 13, 2004                  10,000                          US $22.72
January 13, 2004                   5,000                          US $22.79
January 13, 2004                   5,000                          US $22.80

January 14, 2004                   5,000                          US $22.71
January 14, 2004                   5,000                          US $22.74
January 14, 2004                   1,400                          US $22.75
January 14, 2004                  16,500                          US $22.70
January 14, 2004                   5,800                          US $22.80
January 14, 2004                   2,800                          US $22.85

January 14, 2004                   6,500                          Cdn$29.25
January 14, 2004                   3,000                          Cdn$29.15
January 14, 2004                     500                          Cdn$29.26
January 14, 2004                   2,000                          Cdn$29.32
January 14, 2004                   6,000                          Cdn$29.30
January 14, 2004                   3,500                          Cdn$29.40
January 14, 2004*                120,000                           US$10.00


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*Represents exercise of employee stock option