FILED PURSUANT TO RULE 424(b)(3)
REGISTRATION NO. 333-51879
PROSPECTUS SUPPLEMENT
(TO PROSPECTUS DATED JUNE 18, 1998)
SEPRACOR INC.
----------------------------------------
$189,475,000 PRINCIPAL AMOUNT OF 6 1/4% CONVERTIBLE
SUBORDINATED DEBENTURES DUE 2005
(Interest payable August 15 and February 15)
----------------------------------------
4,012,617 Shares of Common Stock
($0.10 par value per share)
---------------------
The information in this Prospectus Supplement concerning the Selling
Stockholders supplements the statements set forth under the caption "Selling
Stockholders" in the Prospectus. Capitalized items used and not defined herein
shall have the meanings given to them in the Prospectus.
SELLING STOCKHOLDERS
The information set forth under the caption "Selling Stockholders" in
the Prospectus is supplemented as follows:
<TABLE>
<CAPTION>
Amount of Shares of
Amount of Debentures Common Stock
Debentures that Owned Before Shares That May Owned Before
Name May be Sold Offering be Sold(1) Offering
---- --------------- ------------ --------------- -------------
<S> <C> <C> <C> <C>
ICI American
Holdings Trust $425,000 $425,000 8,972 0
Zeneca Holdings Trust 425,000 425,000 8,972 0
State of Delaware
PERS 1,000,000 1,000,000 21,110 0
Starvest Fund-
Discretionary 500,000 500,000 10,555 0
State of Oregon/SAIF
Corporation 4,000,000 4,000,000 84,443 0
State of Oregon PERS 4,500,000 4,500,000 94,998 0
Nalco Chemical Corp.
Retirement 225,000 225,000 4,749 0
<PAGE>
Kapiolani Medical
Center for Women and
Children 100,000 100,000 2,111 0
Hawaiian Airlines
Pension for Salaried
Employees 15,000 15,000 316 0
Hawaiian Airlines
Pilots' Retirement Plan 70,000 70,000 1,477 0
Hawaiian Airlines
Pension Plan - IAM 50,000 50,000 1,055 0
Allstate Insurance
Company 2,000,000 2,000,000 42,221 0
Shepard Investments
International Inc. 14,875,000 14,875,000 314,023 0
Silverton International
Fund Limited 1,500,000 1,500,000 31,662 0
Nomura Securities
(Bermuda) Ltd. 10,000,000 10,000,000 211,108 0
Paloma Securities
L.L.C. 1,725,000 1,725,000 36,416 0
Bost & Co., as
nominee for Mellon
Securities Trust
Company 100,000 100,000 2,111 0
Ell & Co., as nominee
for The Northern
Trust Company of
New York 580,000 580,000 12,244 0
Salkeld & Co., as
nominee for Bankers
Trust Company 615,000 615,000 12,983 0
Bankers Trust
Company 1,500,000 1,500,000 31,662 0
Bear Stearns Securities
Corp. 1,500,000 1,500,000 31,662 0
The Income Fund of
America, Inc. 7,350,000 7,350,000 155,164 0
The TCW Group, Inc. 12,315,000 12,315,000 259,980 0
Deutsche Bank AG 12,105,000 12,105,000 255,546 0
Morgan Stanley Dean
Witter 96,869,605 96,869,605 2,045,000 0
Unknown (2) 15,130,395 15,130,395 319,415 0
- --------------------
</TABLE>
(1) Assumes conversion of full amount of Debentures held by such holder at the
initial rate of $47.369 in principal amount of Debentures per share of
Common Stock.
(2) Certain of the Debentures are currently evidenced by a global Debenture
which has been deposited with DTC and registered in the name of Cede & Co.
as DTC's nominee. Therefore, the Company is unable to provide the names of
the remaining Selling Stockholders.
The date of this Prospectus Supplement is
July 7, 1998
