EXHIBIT 23.3

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


    As independent public accountants, we hereby consent to the incorporation by
reference in this registration statement of Sepracor Inc. of our report dated
January 7, 2001, except with respect to matters discussed in Note Q, as to which
the date is February 7, 2001, on the financial statements of BioSphere
Medical, Inc. and subsidiaries as of and for the year ended December 31, 2000,
included in Sepracor's Form 10-K for the year ended December 31, 2000 and to all
references to our Firm included in this registration statement.


                                        /s/ Arthur Andersen LLP


Boston, Massachusetts
January 28, 2002