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                                                                    EXHIBIT 23.1

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

    As independent public accountants, we hereby consent to the incorporation by
reference in this registration statement of our report dated March 13, 2000,
incorporated by reference in Neopharm, Inc.'s Annual Report on Form 10-K for the
year ended December 31, 1999, as amended, and to all references to our Firm
included in this registration statement.

<TABLE>
<S>                                                   <C>
                                                      /s/ ARTHUR ANDERSEN LLP
                                                      ARTHUR ANDERSEN LLP
</TABLE>

Chicago, Illinois
August 21, 2000



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