<PAGE>
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
--------------------
FORM 8-K
CURRENT REPORT
PURSUANT TO SECTION 13 OR 15(d) OF
THE SECURITIES EXCHANGE ACT OF 1934
Date of Report (Date of earliest event reported): February 8, 2000
SEPRACOR INC.
(Exact name of registrant as specified in its charter)
<TABLE>
<CAPTION>
<S> <C> <C>
DELAWARE 0-19410 22-2536587
------------------------------- ------------------------ ---------------------------------
(State or other jurisdiction of (Commission File Number) (IRS Employer Identification No.)
incorporation)
111 Locke Drive
Marlborough, MA 01757
------------------------------- -----------------------------------
(Address of principal executive (Zip Code)
offices)
</TABLE>
Registrant's telephone number, including area code: (508) 481-6700
N/A
-------------------------------------------------------------
(Former name or former address, if changed since last report)
<PAGE>
Item 5. OTHER EVENTS.
As of February 8, 2000, Sepracor Inc. had converted $96.4 million 6.25%
Convertible Subordinated Debentures Due 2005 (the "Debentures") and $93 million
Debentures were still outstanding. Costs related to the conversion of the
Debentures, including pre-paid interest, premiums and other costs, were $7.5
million.
<PAGE>
SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934,
the Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.
Date: February 22, 2000 SEPRACOR INC.
(Registrant)
By: /s/ Robert F. Scumaci
-----------------------
Robert F. Scumaci
Senior Vice President,
Finance and Administration
