SEPRACOR INC /DE/
SC 13D, 1997-11-10
LABORATORY ANALYTICAL INSTRUMENTS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

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

                                  SEPRACOR INC.
                      ------------------------------------
                                (Name of Issuer)

                          Common Stock, $0.10 Par Value
                       -----------------------------------
                         (Title of Class of Securities)

                                    817315103
                            -----------------------
                                 (CUSIP Number)

                              Stephen M. Vine, Esq.
                    Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                               590 Madison Avenue
                            New York, New York 10022
                                 (212) 872-1000
                  --------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                October 29, 1997
                       ----------------------------------
                      (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: Six copies 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 disclosure
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).

                         Continued on following page(s)
                               Page 1 of 34 Pages
                             Exhibit Index: Page 27



<PAGE>


                                                              Page 2 of 34 Pages

                                  SCHEDULE 13D

CUSIP No. 817315103

1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                  Soros Fund Management LLC

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [_]
                                                     b.  [x]

3        SEC Use Only

4        Source of Funds*

                  AF

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  Delaware

                           7        Sole Voting Power
 Number of                                  740,000
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   740,000
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            740,000

12       Check Box If the Aggregate  Amount in Row (11) Excludes Certain Shares*
         [x]

13       Percent of Class Represented By Amount in Row (11)

                                            2.69%

14       Type of Reporting Person*

                  OO; IA

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>


                                                              Page 3 of 34 Pages

                                  SCHEDULE 13D

CUSIP No. 817315103

1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                  George Soros (in the capacity described herein)

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [_]
                                                     b.  [x]

3        SEC Use Only

4        Source of Funds*

                  PF

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  United States

                           7        Sole Voting Power
 Number of                                  387,500
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  740,000
    Each
  Reporting                9        Sole Dispositive Power
   Person                                    387,500
    With
                           10       Shared Dispositive Power
                                            740,000

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            1,127,500

12       Check Box If the Aggregate  Amount in Row (11) Excludes Certain Shares*
         [x]

13       Percent of Class Represented By Amount in Row (11)

                                            4.10%

14       Type of Reporting Person*

                  IA

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>


                                                              Page 4 of 34 Pages

                                  SCHEDULE 13D

CUSIP No. 817315103


1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                  Stanley F. Druckenmiller (in the capacity described herein)

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [_]
                                                     b.  [x]

3        SEC Use Only

4        Source of Funds*

                  AF

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  United States

                           7        Sole Voting Power
 Number of                                  0
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  740,000
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   0
    With
                           10       Shared Dispositive Power
                                             740,000

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            740,000

12       Check Box If the Aggregate  Amount in Row (11) Excludes Certain Shares*
         [x]

13       Percent of Class Represented By Amount in Row (11)

                                    2.69%

14       Type of Reporting Person*

                  IA

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>


                                                              Page 5 of 34 Pages

                                  SCHEDULE 13D

CUSIP No. 817315103

1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                  Winston Partners, L.P.

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [_]
                                                     b.  [x]

3        SEC Use Only

4        Source of Funds*

                  WC

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  Delaware

                           7        Sole Voting Power
  Number of                                 185,000
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                     0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   185,000
    With
                           10       Shared Dispositive Power
                                               0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            185,000

12       Check Box If the Aggregate  Amount in Row (11) Excludes Certain Shares*
         [x]

13       Percent of Class Represented By Amount in Row (11)

                                    0.67%

14       Type of Reporting Person*

                  PN

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!





<PAGE>


                                                              Page 6 of 34 Pages

                                  SCHEDULE 13D

CUSIP No. 817315103

1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                  Chatterjee Fund Management, L.P.

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [_]
                                                     b.  [x]

3        SEC Use Only

4        Source of Funds*

                  AF

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  Delaware

                           7        Sole Voting Power
  Number of                                 185,000
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                    0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   185,000
    With
                           10       Shared Dispositive Power
                                              0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            185,000

12       Check Box If the Aggregate  Amount in Row (11) Excludes Certain Shares*
         [x]

13       Percent of Class Represented By Amount in Row (11)

                                    0.67%

14       Type of Reporting Person*

                  PN

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!





<PAGE>


                                                              Page 7 of 34 Pages

                                  SCHEDULE 13D
CUSIP No. 817315103

1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                  Winston Partners II LDC

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [_]
                                                     b.  [x]

3        SEC Use Only

4        Source of Funds*

                  WC

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  Cayman Islands

                           7        Sole Voting Power
  Number of                                 223,750
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   223,750
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            223,750

12       Check Box If the Aggregate  Amount in Row (11) Excludes Certain Shares*
         [x]

13       Percent of Class Represented By Amount in Row (11)

                                            0.81%

14       Type of Reporting Person*

         OO; IV

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



<PAGE>


                                                              Page 8 of 34 Pages

                                  SCHEDULE 13D
CUSIP No. 817315103

1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                  Winston Partners II LLC

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [_]
                                                     b.  [x]

3        SEC Use Only

4        Source of Funds*

                  WC

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  Delaware

                           7        Sole Voting Power
  Number of                                 113,750
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   113,750
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            113,750

12       Check Box If the Aggregate  Amount in Row (11) Excludes Certain Shares*
         [x]

13       Percent of Class Represented By Amount in Row (11)

                                            0.41%

14       Type of Reporting Person*

         OO; IV

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



<PAGE>


                                                              Page 9 of 34 Pages

                                  SCHEDULE 13D
CUSIP No. 817315103

1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                  Chatterjee Advisors LLC

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [_]
                                                     b.  [x]

3        SEC Use Only

4        Source of Funds*

                  AF

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  Delaware

                           7        Sole Voting Power
  Number of                                 337,500
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   337,500
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            337,500

12       Check Box If the Aggregate  Amount in Row (11) Excludes Certain Shares*
         [x]

13       Percent of Class Represented By Amount in Row (11)

                                            1.23%

14       Type of Reporting Person*

         OO; IA

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



<PAGE>


                                                             Page 10 of 34 Pages

                                  SCHEDULE 13D
CUSIP No. 817315103

1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                  Chatterjee Management Company

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [_]
                                                     b.  [x]

3        SEC Use Only

4        Source of Funds*

                  AF

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  Delaware

                           7        Sole Voting Power
  Number of                                 337,500
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   337,500
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            337,500

12       Check Box If the Aggregate  Amount in Row (11) Excludes Certain Shares*
         [x]

13       Percent of Class Represented By Amount in Row (11)

                                            1.23%

14       Type of Reporting Person*

         CO; IA

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



<PAGE>


                                                             Page 11 of 34 Pages

                                  SCHEDULE 13D
CUSIP No. 817315103

1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                  Purnendu Chatterjee

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [_]
                                                     b.  [x]

3        SEC Use Only

4        Source of Funds*

                  AF

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [x]

6        Citizenship or Place of Organization

                  United States

                           7        Sole Voting Power
  Number of                                 522,500
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   522,500
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            522,500

12       Check Box If the Aggregate  Amount in Row (11) Excludes Certain Shares*
         [x]

13       Percent of Class Represented By Amount in Row (11)

                                             1.90%

14       Type of Reporting Person*

         IA

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



<PAGE>


                                                             Page 12 of 34 Pages


               This Statement on Schedule 13D relates to shares of Common Stock,
$0.10 par value per share (the "Shares"), of Sepracor Inc. (the "Issuer").  This
Statement is being filed by the Reporting  Persons (as defined herein) to report
recent  acquisitions of Shares of the Issuer as a result of which certain of the
Reporting  Persons may be deemed to be the beneficial  owners of more than 5% of
the total number of outstanding Shares.


Item 1.        Security and Issuer.

               This  Statement  relates  to  the  Shares.  The  address  of  the
principal  executive  office  of the  Issuer is 111  Locke  Drive,  Marlborough,
Massachusetts 01752.

Item 2.        Identity and Background.

               This statement is being filed on behalf of the following  persons
(collectively, the "Reporting Persons"):

               (i)  Soros Fund Management LLC ("SFM LLC");

               (ii) George Soros ("Mr. Soros")

               (iii) Stanley F. Druckenmiller ("Mr. Druckenmiller");

               (iv) Winston Partners, L.P. ("Winston Partners")

               (v)  Chatterjee Fund Management, L.P. ("CFM");

               (vi) Winston Partners II LDC ("Winston LDC");

               (vii) Winston Partners II LLC ("Winston LLC");

               (viii) Chatterjee Advisors LLC ("Chatterjee Advisors");

               (ix) Chatterjee Management Company ("Chatterjee Management"); and

               (x)  Purnendu Chatterjee ("Dr. Chatterjee");

               This statement relates to Shares held for the accounts of Quantum
Partners (as defined herein), Winston Partners, Winston LDC, Winston LLC and Mr.
Soros.




<PAGE>


                                                             Page 13 of 34 Pages

                              The Reporting Persons

SFM LLC, Mr. Soros and Mr. Druckenmiller
- ----------------------------------------

               SFM LLC, a Delaware limited liability company,  has its principal
office at 888 Seventh Avenue, 33rd Floor, New York, New York 10106. The business
of  SFM  LLC  is  managed  through  a  Management   Committee  (the  "Management
Committee")  comprised of Mr. Soros, Mr.  Druckenmiller  and Mr. Gary Gladstein.
Its  principal  business is to serve,  pursuant to  contract,  as the  principal
investment manager to several foreign investment  companies (the "SFM Clients"),
including Quantum Fund (as defined herein) and Quantum  Partners,  the principal
operating  subsidiary  of  Quantum  Fund.  SFM LLC has been  granted  investment
discretion  over  portfolio  investments,  including  the  Shares,  held for the
account of Quantum  Partners LDC, a Cayman  Islands  exempted  limited  duration
company  ("Quantum  Partners")  and Quantum  Fund N.V., a  Netherlands  Antilles
company  ("Quantum  Fund").  Each of Quantum  Fund and Quantum  Partners has its
principal office at Kaya Flamboyan 9, Willemstad, Curacao, Netherlands Antilles.
SFM LLC's  contracts  with the SFM  Clients  generally  provide  that SFM LLC is
responsible for designing and implementing  the SFM Clients' overall  investment
strategies;  for conducting direct portfolio management strategies to the extent
that SFM LLC  determines  that it is  appropriate  to utilize its own  portfolio
management  capabilities;   for  selecting,   evaluating  and  monitoring  other
investment advisors who manage separate portfolios on behalf of the SFM Clients;
and for allocating and  reallocating  the SFM Clients'  assets among the outside
managers and itself.

               Mr. Soros,  as Chairman of SFM LLC, has the ability to direct the
investment  decisions  of SFM LLC and as such may be deemed  to have  investment
discretion  over the  Shares  held for the  account  of  Quantum  Partners.  Mr.
Druckenmiller,  as Lead Portfolio  Manager of SFM LLC, has the ability to direct
the investment decisions of SFM LLC and as such may be deemed to have investment
discretion over the Shares held for the account of Quantum  Partners.  Set forth
in Annex A hereto and  incorporated  by reference in response to this Item 2 and
elsewhere in this Schedule 13D as applicable is a list of the Managing Directors
of SFM LLC.

               The principal  occupation of Mr. Soros, a United States  citizen,
is his  direction  of the  activities  of SFM LLC,  which is carried  out in his
capacity as Chairman of SFM LLC at SFM LLC's principal office.

               The principal  occupation of Mr.  Druckenmiller,  a United States
citizen,  is  his  position  as  Lead  Portfolio  Manager  and a  Member  of the
Management  Committee  of SFM LLC,  which is carried out at SFM LLC's  principal
office.

               Pursuant to  regulations  promulgated  under Section 13(d) of the
Act,  SFM LLC,  Mr.  Soros,  in his  capacity as  Chairman  of SFM LLC,  and Mr.
Druckenmiller, in his capacity as Lead Portfolio Manager of SFM LLC, each may be
deemed a beneficial owner of the Shares held for the account of Quantum Partners
as a result of the  contractual  authority  of SFM LLC to  exercise  voting  and
dispositive power with respect to such Shares.

               During  the  past  five  years,  none of the  Reporting  Persons,
Quantum Partners and, to the best of the Reporting Persons' knowledge, any other
person  identified  in  response  to this  Item 2 has  been (a)  convicted  in a
criminal proceeding, or (b) a party to any civil proceeding as a result of which
it or he has been subject to a judgment,  decree or final order enjoining future
violations  of, or prohibiting  or mandating  activities  subject to, federal or
state securities laws, or finding any violation with respect to such laws.




<PAGE>


                                                             Page 14 of 34 Pages

Winston  Partners,  CFM,  Winston  LDC,  Winston  LLC,  Chatterjee  Advisors and
Chatterjee Management
- --------------------------------------------------------------------------------

               Winston  Partners  is a  Delaware  limited  partnership  which is
principally  engaged in  investing  in  securities.  CFM is a  Delaware  limited
partnership and the general partner of Winston  Partners.  Dr. Chatterjee is the
sole general  partner of CFM. The  principal  business of CFM is to serve as the
sole  general  partner  of Winston  Partners.  The  principal  office of Winston
Partners and CFM is located at 888 Seventh  Avenue,  30th Floor,  New York,  New
York 10106. Pursuant to regulations  promulgated under Section 13(d) of the Act,
CFM, as the sole general partner of Winston Partners, may be deemed a beneficial
owner of the Shares held for the account of Winston Partners.

               Winston LDC is a Cayman Islands exempted limited duration company
with its principal office at Kaya Flamboyan 9, Willemstad,  Curacao, Netherlands
Antilles. Winston LDC was organized as the operating unit of Winston Partners II
Offshore Ltd., an open-end investment company incorporated in the British Virgin
Islands (the "Winston Offshore").  Winston Offshore invests all of its assets in
Winston LDC, and is the largest  shareholder in Winston LDC. Chatterjee Advisors
and Chatterjee Fund Investors LDC (an affiliate of Chatterjee Advisors) are also
shareholders of Winston LDC. The principal  business of Winston LDC is investing
in securities.

               Winston LLC is a limited  liability company formed under the laws
of the State of Delaware with its principal  office at 888 Seventh Avenue,  30th
Floor,  New York,  New York  10106.  Chatterjee  Advisors  and  Chatterjee  Fund
Investors  LDC (an affiliate of Chatterjee  Advisors) are also  shareholders  of
Winston LLC. The principal business of Winston LLC is investing in securities.

               Chatterjee Advisors, a Delaware limited liability company that is
managed  and  controlled  by  Dr.  Chatterjee,  serves  as the  manager,  and is
responsible for  supervising the operations,  of each of Winston LDC and Winston
LLC.  The  principal  office of  Chatterjee  Advisors  is located at 888 Seventh
Avenue, 30th Floor, New York, New York 10106. Chatterjee Management,  a Delaware
corporation  that  is  managed  and  controlled  by Dr.  Chatterjee,  serves  as
investment advisor to each of Winston LDC and Winston LLC pursuant to investment
management contracts between Chatterjee Management, Chatterjee Advisors and each
of  Winston  LDC and  Winston  LLC.  As  such,  Chatterjee  Management  has full
discretion  and  authority to make  investments  in  securities  (including  the
Shares) on behalf of each of Winston LDC and Winston LLC. The  principal  office
of Chatterjee Management is located at 888 Seventh Avenue, 30th Floor, New York,
New York 10106.

               Pursuant to  regulations  promulgated  under Section 13(d) of the
Act,  each of  Chatterjee  Advisors,  as the  manager of each of Winston LDC and
Winston  LLC,  and  by  reason  of its  ability  as  manager  to  terminate  the
contractual  relationship  of  Winston  LDC  and  Winston  LLC  with  Chatterjee
Management  within 60 days, and Chatterjee  Management,  by reason of its voting
and  dispositive  power over securities held for the accounts of Winston LDC and
Winston  LLC,  may each be  deemed  to be the  beneficial  owner  of  securities
(including  the Shares)  held for the account of each of Winston LDC and Winston
LLC.

               During  the past  five  years,  none of  Winston  Partners,  CFM,
Winston LDC,  Winston LLC,  Chatterjee  Advisors and  Chatterjee  Management has
been:  (a)  convicted  in a  criminal  proceeding;  or (b) a party to any  civil
proceeding  as a result of which  any of them has been  subject  to a  judgment,
decree  or final  order  enjoining  future  violations  of,  or  prohibiting  or
mandating  activities  subject to, federal or state  securities laws, or finding
any violation with respect to such laws.



<PAGE>


                                                             Page 15 of 34 Pages

Dr. Chatterjee
- --------------

               The  principal  occupation  of Dr.  Chatterjee,  a United  States
citizen, is as an investment manager.  Dr. Chatterjee has his principal place of
business at 888 Seventh Avenue,  30th Floor, New York, New York 10106.  Pursuant
to regulations promulgated under Section 13(d) of the Act, Dr. Chatterjee may be
deemed the  beneficial  owner of securities  (including the Shares) held for the
account of Winston  Partners (as the sole general  partner of CFM and the person
ultimately in control of Winston  Partners),  Winston II LDC (as manager and the
person ultimately in control of Chatterjee  Advisors and Chatterjee  Management)
and  Winston  II LLC (as  manager  and  the  person  ultimately  in  control  of
Chatterjee Advisors and Chatterjee Management).

               On January 13, 1993, the Securities and Exchange  Commission (the
"Commission")  filed a civil  complaint in the United States  District Court for
the  District  of  Massachusetts  against  certain  defendants,   including  Dr.
Chatterjee,  wherein  the  Commission  alleged  that Dr.  Chatterjee  engaged in
conduct in violation of, or aided and abetted  certain  alleged  violations  of,
Sections  10(b) and 14(e) of the Act and certain rules  promulgated  thereunder.
Dr.  Chatterjee  settled the  Commission's  action on the same date it was filed
without  admitting or denying the allegations of the complaint.  Dr.  Chatterjee
consented to the entry of a Final Judgment  restraining  and enjoining him from,
inter alia, violating,  or aiding and abetting violations of, Sections 10(b) and
14(e) of the Act and the  rules  promulgated  thereunder.  Dr.  Chatterjee  also
agreed to pay a civil  penalty  of  $643,855.  During the past five  years,  Dr.
Chatterjee, has not been convicted in any criminal proceeding.

Item 3.        Source and Amount of Funds or Other Consideration

               Quantum  Partners  expended  approximately   $24,378,537  of  its
working capital to purchase Shares reported herein as being acquired in the last
60 days.

               Mr.  Soros  expended  approximately  $13,400,257  of his personal
funds to purchase Shares reported herein as being acquired in the last 60 days.

               Winston Partners expended approximately $5,837,816 of its working
capital to  purchase  Shares  reported  herein as being  acquired in the last 60
days.

               Winston  LDC  expended  approximately  $6,985,146  of its working
capital to  purchase  Shares  reported  herein as being  acquired in the last 60
days.

               Winston  LLC  expended  approximately  $3,548,801  of its working
capital to  purchase  Shares  reported  herein as being  acquired in the last 60
days.

               The Shares held for the accounts of Quantum Partners,  Mr. Soros,
Winston  Partners,  Winston  LDC and  Winston  LLC may be  held  through  margin
accounts  maintained  with  brokers,  which  extend  margin  credit  as and when
required  to open or  carry  positions  in their  margin  accounts,  subject  to
applicable  federal  margin  regulations,  stock  exchange rules and such firms'
credit policies. The Shares which may be held in the margin accounts are pledged
as  collateral  security for the repayment of debit  balances in the  respective
accounts.



<PAGE>


                                                             Page 16 of 34 Pages

Item 4.        Purpose of Transaction.

               All of the Shares  reported herein as having been acquired for or
disposed of from the accounts of Quantum Partners,  Mr. Soros, Winston Partners,
Winston  LDC and  Winston  LLC  were  acquired  or  disposed  of for  investment
purposes.  Neither Quantum  Partners,  the Reporting Persons nor, to the best of
their knowledge,  any of the other individuals identified in response to Item 2,
has any  plans  or  proposals  that  relate  to or  would  result  in any of the
transactions  described in  subparagraphs  (a) through (j) of Item 4 of Schedule
13D.  The  Reporting  Persons  reserve  the  right  to  acquire,  or cause to be
acquired,  additional  securities  of the  Issuer,  to  dispose,  or cause to be
disposed of, such securities at any time or to formulate  other purposes,  plans
or proposals regarding the Issuer or any of its securities, to the extent deemed
advisable in light of general  investment and trading  policies of the Reporting
Persons and/or the SFM LLC Clients, market conditions or other factors.

Item 5.        Interest in Securities of the Issuer.

               (a)  (i)  SFM  LLC  and  Mr.  Druckenmiller  may  be  deemed  the
beneficial  owner of the 740,000 Shares held for the account of Quantum Partners
(approximately 2.69% of the total number of Shares outstanding).

                    (ii) Mr.  Soros  may  be  deemed  the  beneficial  owner  of
1,127,500   Shares   (approximately   4.10%  of  the  total   number  of  Shares
outstanding). This number consists of (A) 740,000 Shares held for the account of
Quantum Partners and (B) 387,500 Shares held for his personal account.

                    (iii)Winston  Partners and CFM may be deemed the  beneficial
owner of 185,000 Shares held for the account of Winston Partners  (approximately
0.67% of the total number of Shares outstanding).

                    (iv) Winston LDC may be deemed the  beneficial  owner of the
223,750 Shares held for its account  (approximately 0.81% of the total number of
Shares outstanding).

                    (v)  Winston LLC may be deemed the  beneficial  owner of the
113,750 Shares held for its account  (approximately 0.41% of the total number of
Shares outstanding).

                    (vi) Chatterjee  Management and  Chatterjee  Advisors may be
deemed the beneficial owner of 337,500 Shares  (approximately 1.23% of the total
number of Shares outstanding).  This number consists of (A) 223,750 Shares which
Winston  LDC may be deemed to own  beneficially  and (B)  113,750  Shares  which
Winston LLC may be deemed to own beneficially.

                    (vii)Dr.  Chatterjee may be deemed the  beneficial  owner of
522,500 Shares  (approximately 1.90% of the total number of Shares outstanding).
This number  consists of (A) 337,500  Shares  which  Chatterjee  Management  and
Chatterjee  Advisors may be deemed to own  beneficially  and (B) 185,000  Shares
which CFM and Winston Partners may be deemed to own beneficially.

               (b)  (i)  Pursuant to the terms of the contract  between  Quantum
Fund and SFM LLC,  SFM LLC may be deemed to have sole power to direct the voting
and disposition of the 740,000 Shares held for the account of Quantum Partners.



<PAGE>


                                                             Page 17 of 34 Pages

                    (ii) Pursuant to the terms of the contract  between  Quantum
Fund and SFM LLC and as a result  of the  positions  held by Mr.  Soros  and Mr.
Druckenmiller  with SFM LLC,  each of Mr.  Soros  and Mr.  Druckenmiller  may be
deemed to have shared power to direct the voting and  disposition of the 740,000
Shares held for the account of Quantum Partners.

                    (iii)Mr.  Soros has the sole  power to vote and  dispose  of
the 387,500 Shares held for his personal account.

                    (iv) Each  of  Winston  LDC,  Chatterjee  Advisors  (in  its
capacity as manager of Winston LDC),  Chatterjee  Management (in its capacity as
investment  advisor to Winston LDC) and Dr. Chatterjee (as the person ultimately
in control of both Chatterjee Advisors and Chatterjee  Management) may be deemed
to have the sole  power to direct  the voting  and  disposition  of the  223,750
Shares held for the account of Winston LDC.

                    (v)  Each  of  Winston  LLC,  Chatterjee  Advisors  (in  its
capacity as manager of Winston LLC),  Chatterjee  Management (in its capacity as
investment  advisor to Winston LLC) and Dr.  Chatterjee  (in his capacity as the
person  ultimately  in  control  of  both  Chatterjee  Advisors  and  Chatterjee
Management)  may be  deemed  to have the sole  power to direct  the  voting  and
disposition of the 113,750 Shares held for the account of Winston LLC.

                    (vi) Each of Winston  L.P.,  CFM (as the general  partner of
Winston  L.P.) and Dr.  Chatterjee  (as the sole general  partner of CFM) may be
deemed to have the sole  power to  direct  the  voting  and  disposition  of the
185,000 Shares held for the account of Winston L.P.

               (c)       Except  for  the  transactions  disclosed  on  Annex  B
attached hereto, all of which were executed in routine brokerage transactions in
the  over-the-counter  market,  there have been no  transactions  effected  with
respect  to the  Shares  since  September  11,  1997 (60 days  prior to the date
hereof) by any of the Reporting Persons or Quantum Partners.

               (d)  (i) The shareholders of Quantum Partners,  including Quantum
Fund,  have the right to  participate  in the  receipt  of  dividends  from,  or
proceeds  from the sale of, the Shares held for the account of Quantum  Partners
in accordance with their ownership interests in Quantum Partners.

                    (ii) Mr.  Soros  has the sole  right to  participate  in the
receipt of dividends  from,  and proceeds  from the sale of, the Shares held for
his personal account.

                    (iii)The  shareholders  of Winston  LDC,  including  Winston
Offshore,  have the right to  participate  in the receipt of dividends  from, or
proceeds  from the sale of, the Shares  held by Winston LDC in  accordance  with
their ownership interests in Winston LDC.

                    (iv) The   members  of   Winston   LLC  have  the  right  to
participate in the receipt of dividends  from, or proceeds from the sale of, the
Shares held for the account of Winston LLC in  accordance  with their  ownership
interests in Winston LLC.

                    (v)  The  partners  of  Winston  Partners  have the right to
participate in the receipt of dividends  from, or proceeds from the sale of, the
Shares  held for the  account  of  Winston  Partners  in  accordance  with their
partnership interests in Winston Partners.



<PAGE>


                                                             Page 18 of 34 Pages

               (e)  Not applicable.

               Each  of  SFM  LLC  and  Mr.  Druckenmiller  expressly  disclaims
beneficial ownership of any Shares not held for the accounts of the SFM Clients.
Mr. Soros expressly  disclaims  beneficial  ownership of any Shares not held for
the accounts of the SFM Clients and his  personal  account.  Each of  Chatterjee
Advisors and Chatterjee  Management  expressly disclaims beneficial ownership of
any Shares not held  directly  for the  accounts of Winston LDC and Winston LLC.
Winston LDC expressly disclaims  beneficial ownership of any Shares not held for
its account.  Winston LLC expressly disclaims beneficial ownership of any Shares
not held  directly for its account.  Each of Winston  Partners and CFM expressly
disclaims  beneficial  ownership of any Shares not held directly for the account
of Winston Partners.  Dr. Chatterjee expressly disclaims beneficial ownership of
any  Shares  not held for the  accounts  of Winston  Partners,  Winston  LDC and
Winston LLC.

Item 6.        Contracts,  Arrangements,  Understandings  or Relationships  with
               Respect to Securities of the Issuer.

               Dr.  Chatterjee has reached  understandings  with each of Quantum
Partners  and SFM LLC pursuant to which Dr.  Chatterjee  will furnish to each of
Quantum  Partners and SFM LLC  recommendations  concerning  transactions  in the
Shares.  It is  contemplated by the Reporting  Persons that Dr.  Chatterjee will
share in any  profits  with  respect to Shares  held for the  account of Quantum
Partners  and in any  profits  or losses  with  respect  to Shares  held for the
account of Mr. Soros.

               From time to time each of the Reporting Persons, Quantum Partners
and/or  other SFM Clients may lend  portfolio  securities  to brokers,  banks or
other financial  institutions.  These loans  typically  obligate the borrower to
return the  securities,  or an equal amount of securities of the same class,  to
the lender and  typically  provide  that the  borrower  is  entitled to exercise
voting rights and to retain  dividends during the term of the loan. From time to
time to the extent permitted by applicable law, each of such persons or entities
may borrow the Shares for the purpose of effecting,  and may effect,  short sale
transactions,  and may purchase  securities for the purpose of closing out short
positions in such securities.

               Except  as set  forth  herein,  the  Reporting  Persons,  Quantum
Partners  and/or  other SFM  Clients  do not have any  contracts,  arrangements,
understandings or relationships with respect to any securities of the Issuer.



<PAGE>


                                                             Page 19 of 34 Pages


Item 7.        Material to be Filed as Exhibits.

          A.   Power of  Attorney  dated as of  January  1, 1997  granted by Mr.
               Soros in favor of Mr. Sean C. Warren and Mr. Michael C. Neus.

          B.   Power of  Attorney  dated as of  January  1, 1997  granted by Mr.
               Druckenmiller  in favor of Mr. Sean C. Warren and Mr.  Michael C.
               Neus.

          C.   Power of Attorney,  dated May 31, 1995, granted by Dr. Chatterjee
               in favor of Mr. Peter Hurwitz.

          D.   Power of Attorney, dated October 25, 1996, granted by Winston LDC
               in favor of Mr. Peter Hurwitz.

          E.   Joint  Filing  dated  November 10, 1997 by and among SFM LLC, Mr.
               Soros, Mr.  Druckenmiller,  Winston  Partners,  CFM, Winston LDC,
               Winston LLC, Chatterjee Advisors,  Chatterjee  Management and Dr.
               Chatterjee.



<PAGE>


                                                             Page 20 of 34 Pages

                                   SIGNATURES

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

Date:  November 10, 1997


                                   SOROS FUND MANAGEMENT LLC

                                   By:  /S/ MICHAEL C. NEUS
                                        ---------------------------------------
                                        Michael C. Neus
                                        Assistant General Counsel


                                   GEORGE SOROS

                                   By:  /S/ MICHAEL C. NEUS
                                        ---------------------------------------
                                        Michael C. Neus
                                        Attorney-in-Fact


                                   STANLEY F. DRUCKENMILLER

                                   By:  /S/ MICHAEL C. NEUS
                                        ---------------------------------------
                                        Michael C. Neus
                                        Attorney-in-Fact


                                   WINSTON PARTNERS, L.P.

                                   By:  Chatterjee Fund Management, L.P.,
                                        its General Partner

                                        By:  Purnendu Chatterjee,
                                             its General Partner

                                             By:  /S/ PETER HURWITZ
                                                  -----------------------------
                                                  Peter Hurwitz
                                                  Attorney-in-Fact



<PAGE>


                                                             Page 21 of 34 Pages


                                   CHATTERJEE FUND MANAGEMENT, L.P.

                                   By:  Purnendu Chatterjee,
                                        its General Partner

                                        By:  /S/ PETER HURWITZ
                                             ----------------------------------
                                             Peter Hurwitz
                                             Attorney-in-Fact


                                   WINSTON PARTNERS II LDC

                                   By:  /S/ PETER HURWITZ
                                        ----------------------------------
                                        Peter Hurwitz
                                        Attorney-in-Fact


                                   WINSTON PARTNERS II LLC

                                   By:  Chatterjee Advisors LLC, its Manager

                                        By:  /S/ PETER HURWITZ
                                             ----------------------------------
                                             Peter Hurwitz
                                             Manager


                                   CHATTERJEE ADVISORS LLC

                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Manager


                                   CHATTERJEE MANAGEMENT COMPANY

                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Vice President



<PAGE>


                                                             Page 22 of 34 Pages


                                   PURNENDU CHATTERJEE

                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Attorney-in-Fact


<PAGE>


                                                             Page 23 of 34 Pages

                                     ANNEX A


               The following is a list of all of the persons (other than Stanley
Druckenmiller) who serve as Managing Directors of SFM LLC:


                               Scott K. H. Bessent
                                 Walter Burlock
                                Brian J. Corvese
                               Jeffrey L. Feinberg
                                  Arminio Fraga
                               David Gerstenhaber
                                 Gary Gladstein
                                    Ron Hiram
                                Robert K. Jermain
                                 David N. Kowitz
                               Alexander C. McAree
                                  Paul McNulty
                              Gabriel S. Nechamkin
                                   Steven Okin
                                  Dale Precoda
                               Lief D. Rosenblatt
                                 Mark D. Sonnino
                             Filiberto H. Verticelli
                                 Sean C. Warren
                                 John Zwaanstra

Each of the  above-listed  persons is a United States  citizen  whose  principal
occupation  is serving as Managing  Director of SFM LLC, and each has a business
address c/o Soros Fund Management LLC, 888 Seventh Avenue, 33rd Floor, New York,
New York 10106.

To the best of the Reporting Persons' knowledge:

         (a)  None of the above persons holds any Shares.
         (b)  None  of  the  above  persons  has  any  contracts,  arrangements,
understandings or relationships with respect to the Shares.





<PAGE>
<TABLE>
<CAPTION>


                                                                                      Page 24 of 34 Pages


                                                 ANNEX B

                                RECENT TRANSACTIONS IN THE COMMON STOCK OF
                                              SEPRACOR INC.


                                   Date of          Nature of         Number of                Price
For the Account of               Transaction       Transaction         Shares                 Per Share
- ------------------               -----------       -----------        ---------               ---------
<S>                             <C>               <C>                <C>                     <C>

Quantum Partners/1/                9/16/97             BUY              85,700                   31.851
                                   9/16/97             BUY             115,000                   30.26
                                   9/17/97             BUY               4,300                   32.145
                                   9/17/97             BUY              48,800                   32.269
                                   9/17/97             BUY             164,600                   32.174
                                   9/18/97             BUY              30,800                   32.312
                                   9/18/97             BUY               9,200                   32.375
                                   9/18/97             BUY              30,800                   32.275
                                   9/18/97             BUY              15,800                   32.259
                                   9/19/97             BUY              17,500                   33.483
                                   9/22/97             BUY              33,300                   35.814
                                   9/23/97             BUY              39,700                   35.975
                                   9/24/97             BUY              81,900                   36.133
                                   9/25/97             BUY              21,200                   35.125
                                   9/25/97             BUY              41,400                   35.089

Quasar Partners/2/                 9/26/97             SALE              3,300                   33.91
(as defined herein)                9/26/97             SALE             12,500                   33.911
                                   9/26/97             SALE              3,500                   33.909
                                   9/26/97             SALE              5,000                   33.912
                                   9/26/97             SALE              5,000                   33.912
                                   9/26/97             SALE              4,000                   33.91
                                   9/26/97             SALE              2,500                   33.912
                                   9/26/97             SALE              2,000                   33.904

Winston Partners LDC                9/9/97             BUY              50,000                   25.371
                                   9/10/97             BUY              30,000                   25.104
                                   9/11/97             BUY              20,000                   27.901
                                  10/28/97             BUY              20,100                   32.76
                                  10/28/97             BUY               1,900                   32.07
                                  10/29/97             BUY              25,100                   36.151
                                  10/30/97             BUY               8,800                   36.041
                                  10/30/97             BUY               8,400                   35.3
                                  10/31/97             BUY               2,000                   35.773
                                  10/31/97             BUY              26,900                   35.718



<PAGE>


                                                                                      Page 25 of 34 Pages

                                   Date of          Nature of         Number of                Price
For the Account of               Transaction       Transaction         Shares                 Per Share
- ------------------               -----------       -----------        ---------               ---------
Winston Partners LDC (cont.)       11/3/97             BUY              5,400                   35.981
                                   11/4/97             BUY              3,350                   36.676
                                   11/4/97             BUY             13,400                   37.462
                                   11/7/97             BUY              8,400                   37.317

Winston Partners LLC                9/9/97             BUY             25,000                   25.371
                                   9/10/97             BUY             15,000                   25.104
                                   9/11/97             BUY             10,000                   27.901
                                  10/28/97             BUY              9,900                   32.76
                                  10/28/97             BUY              3,900                   32.07
                                  10/29/97             BUY             12,300                   36.151
                                  10/30/97             BUY              4,400                   36.041
                                  10/30/97             BUY              4,100                   35.3
                                  10/31/97             BUY              1,000                   35.773
                                  10/31/97             BUY             13,100                   35.718
                                   11/3/97             BUY              2,700                   35.981
                                   11/4/97             BUY              1,650                   36.676
                                   11/4/97             BUY              6,600                   37.462
                                   11/7/97             BUY              4,100                   37.317

Winston Partners, L.P.              9/9/97             BUY             25,000                   25.371
                                   9/10/97             BUY             15,000                   25.104
                                   9/11/97             BUY             10,000                   27.901
                                   9/17/97             BUY              1,100                   32.145
                                   9/17/97             BUY             12,300                   32.269
                                   9/17/97             BUY             41,200                   32.174
                                   9/18/97             BUY              7,700                   32.312
                                   9/18/97             BUY              2,300                   32.375
                                   9/18/97             BUY              7,700                   32.275
                                   9/18/97             BUY              3,900                   32.259
                                   9/19/97             BUY              4,500                   33.483
                                   9/22/97             BUY              8,400                   35.814
                                   9/23/97             BUY             10,000                   35.975
                                   9/24/97             BUY             20,500                   36.133
                                   9/25/97             BUY              5,100                   35.125
                                   9/25/97             BUY             10,300                   35.089

Mr. Soros                          9/17/97             BUY              1,600                   32.145
                                   9/17/97             BUY             18,200                   32.269
                                   9/17/97             BUY             61,500                   32.174
                                   9/18/97             BUY             11,500                   32.312
                                   9/18/97             BUY              3,500                   32.375
                                   9/18/97             BUY             11,500                   32.275
                                   9/18/97             BUY              5,900                   32.259
                                   9/19/97             BUY              6,500                   33.483
                                   9/22/97             BUY             12,400                   35.814
                                   9/23/97             BUY             14,800                   35.975
                                   9/24/97             BUY             30,600                   36.133
                                   9/25/97             BUY              6,500                   35.125



<PAGE>


                                                                                      Page 26 of 34 Pages
                                   Date of          Nature of         Number of                Price
For the Account of               Transaction       Transaction         Shares                 Per Share
- ------------------               -----------       -----------        ---------               ---------

Mr. Soros (cont.)                  9/25/97             BUY             15,500                   35.089
                                   10/28/97            BUY             30,000                   32.76
                                   10/28/97            BUY              5,800                   32.07
                                   10/29/97            BUY             37,400                   36.151
                                   10/30/97            BUY             12,500                   35.3
                                   10/30/97            BUY             13,200                   36.041
                                   10/31/97            BUY              3,000                   35.773
                                   10/31/97            BUY             40,000                   35.718
                                   11/3/97             BUY              8,100                   35.981
                                   11/4/97             BUY              5,000                   36.676
                                   11/4/97             BUY             20,000                   37.462
                                   11/7/97             BUY             12,500                   37.317




- -------------------------
/1/       Transactions effected at the direction of SFM LLC.
/2/       Transactions  effected at the direction of Oracle Investment  Management,  Inc. ("OIM"). At the
          direction of SFM LLC,  Quasar  International  Partners  C.V., a  Netherlands  Antilles  limited
          partnership  ("Quasar Partners") entered into an investment advisory contract with OIM pursuant
          to which OIM was granted  investment  discretion  over certain funds of Quasar  Partners.  As a
          result of these  sales,  Quasar  Partners may no longer be deemed the  beneficial  owner of any
          Shares.

</TABLE>
<PAGE>


                                                             Page 27 of 34 Pages


                                  EXHIBIT INDEX

                                                                        Page No.
                                                                        -------

A.        Power of Attorney  dated as of January 1, 1997  granted
          by Mr.  George Soros in favor of Mr. Sean C. Warren and
          Mr. Michael C. Neus..............................................28

B.        Power of Attorney  dated as of January 1, 1997  granted
          by Mr. Stanley F. Druckenmiller in favor of Mr. Sean C.
          Warren and Mr. Michael C. Neus...................................29

C.        Power of Attorney,  dated May 31, 1995,  granted by Dr.
          Chatterjee in favor of Mr. Peter Hurwitz.........................30

D.        Power of Attorney,  dated October 25, 1996,  granted by
          Winston   Partners  II  LDC  in  favor  of  Mr.   Peter
          Hurwitz..........................................................31

E.        Joint Filing dated November 10, 1997 by and among Soros
          Fund Management  LLC, Mr. George Soros,  Mr. Stanley F.
          Druckenmiller,  Winston Partners, L.P., Chatterjee Fund
          Management,  L.P.,  Winston  Partners  II LDC,  Winston
          Partners II LLC,  Chatterjee  Advisors LLC,  Chatterjee
          Management Company and Purnendu Chatterjee.......................32





                                                             Page 28 of 34 Pages

                                    EXHIBIT A

                                POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENTS,  that I, GEORGE SOROS,  hereby make,  constitute
and appoint each of SEAN C. WARREN and MICHAEL C. NEUS, acting individually,  as
my agent and attorney-in-fact for the purpose of executing in my name, (a) in my
personal  capacity or (b) in my capacity as Chairman  of,  member of or in other
capacities  with  Soros  Fund  Management  LLC,  all  documents,   certificates,
instruments,  statements,  filings and agreements ("documents") to be filed with
or  delivered  to any foreign or domestic  governmental  or  regulatory  body or
required or  requested  by any other  person or entity  pursuant to any legal or
regulatory  requirement  relating to the acquisition,  ownership,  management or
disposition of securities or other investments, and any other documents relating
or ancillary  thereto,  including but not limited to, all documents  relating to
filings with the United States  Securities and Exchange  Commission  (the "SEC")
pursuant to the Securities  Act of 1933 or the  Securities  Exchange Act of 1934
(the "Act") and the rules and regulations promulgated thereunder, including: (1)
all documents relating to the beneficial  ownership of securities required to be
filed  with  the SEC  pursuant  to  Section  13(d) or  Section  16(a) of the Act
including, without limitation: (a) any acquisition statements on Schedule 13D or
Schedule  13G and  any  amendments  thereto,  (b) any  joint  filing  agreements
pursuant to Rule  13d-1(f) and (c) any initial  statements  of, or statements of
changes in,  beneficial  ownership of securities on Form 3, Form 4 or Form 5 and
(2) any  information  statements  on Form 13F  required to be filed with the SEC
pursuant to Section 13(f) of the Act.

All past acts of the attorney-in-fact in furtherance of the foregoing are hereby
ratified and confirmed.

This power of attorney shall be valid from the date hereof until revoked by me.

IN  WITNESS  WHEREOF,  I have  executed  this  instrument  as of the  1st day of
January, 1997.




                                        /s/ George Soros
                                        --------------------------
                                        GEORGE SOROS




                                                             Page 29 of 34 Pages

                                    EXHIBIT B

                                POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENTS,  that I, STANLEY F. DRUCKENMILLER,  hereby make,
constitute  and  appoint  each of SEAN C.  WARREN and  MICHAEL  C. NEUS,  acting
individually,  as my agent and  attorney-in-fact for the purpose of executing in
my name,  (a) in my personal  capacity  or (b) in my capacity as Lead  Portfolio
Manager of, member of or in other capacities with Soros Fund Management LLC, all
documents,  certificates,   instruments,   statements,  filings  and  agreements
("documents")  to be  filed  with  or  delivered  to  any  foreign  or  domestic
governmental  or regulatory body or required or requested by any other person or
entity  pursuant  to  any  legal  or  regulatory  requirement  relating  to  the
acquisition,  ownership,  management  or  disposition  of  securities  or  other
investments,  and any other documents relating or ancillary  thereto,  including
but not limited to, all  documents  relating to filings  with the United  States
Securities and Exchange Commission (the "SEC") pursuant to the Securities Act of
1933 or the  Securities  Exchange  Act of 1934  (the  "Act")  and the  rules and
regulations promulgated thereunder, including: (1) all documents relating to the
beneficial ownership of securities required to be filed with the SEC pursuant to
Section 13(d) or Section 16(a) of the Act including, without limitation: (a) any
acquisition  statements  on  Schedule  13D or  Schedule  13G and any  amendments
thereto,  (b) any joint filing agreements  pursuant to Rule 13d-1(f) and (c) any
initial  statements  of, or  statements of changes in,  beneficial  ownership of
securities  on Form 3, Form 4 or Form 5 and (2) any  information  statements  on
Form 13F required to be filed with the SEC pursuant to Section 13(f) of the Act.

All past acts of the attorney-in-fact in furtherance of the foregoing are hereby
ratified and confirmed.

This power of attorney shall be valid from the date hereof until revoked by me.

IN  WITNESS  WHEREOF,  I have  executed  this  instrument  as of the  1st day of
January, 1997.




                                             /s/ Stanley F. Druckenmiller
                                             ----------------------------------
                                             STANLEY F. DRUCKENMILLER






                                                             Page 30 of 34 Pages

                                    EXHIBIT C

                                POWER OF ATTORNEY



KNOW  ALL MEN BY  THESE  PRESENT,  that I,  PURNENDU  CHATTERJEE,  hereby  make,
constitute  and appoint  PETER  HURWITZ as my agent and attorney in fact for the
purpose  of  executing  in my name or in my  personal  capacity  all  documents,
certificates,  instruments,  statements, filings and agreements ("documents") to
be filed with or delivered to any foreign or domestic governmental or regulatory
body or  required or  requested  by any other  person or entity  pursuant to any
legal  or  regulatory  requirement  relating  to  the  acquisition,   ownership,
management or  disposition  of securities  or other  investments,  and any other
documents  relating  or  ancillary  thereto,  including  but not limited to, all
documents  relating to filings with the Securities and Exchange  Commission (the
"SEC") pursuant to the Securities Act of 1933 or the Securities  Exchange Act of
1934  (the  "Act")  and  the  rules  and  regulations   promulgated  thereunder,
including:  (1) all documents relating to the beneficial ownership of securities
required to be filed with the SEC pursuant to Section  13(d) or Section 16(a) of
the Act  including,  without  limitation:  (a)  any  acquisition  statements  on
Schedule 13D or Schedule 13G and any  amendments  thereto,  (b) any joint filing
agreements  pursuant to Rule  13(d)-1(f)  and (c) any initial  statements of, or
statements of changes in,  beneficial  ownership of securities on Form 3, Form 4
or Form 5 and (2) any  information  statements  on Form 13F required to be filed
with the SEC pursuant to Section 13(f) of the Act.

All past acts of the attorney-in-fact in furtherance of the foregoing are hereby
ratified and confirmed.

This power of attorney shall be valid from the date hereof until revoked by me.

IN WITNESS WHEREOF, I have executed this instrument this 31st day of May, 1995.


                                   /s/ Purnendu Chatterjee
                                   ----------------------------------------
                                   PURNENDU CHATTERJEE



                                                             Page 31 of 34 Pages

                                    EXHIBIT D

                                POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENT,  that the  undersigned,  Winston  Partners II LDC
(the "Company"),  a Cayman Islands exempted  limited  duration  company,  hereby
makes,  constitutes  and appoints  PETER A. HURWITZ as the  Company's  agent and
attorney  in fact for the purpose of  executing  on behalf of the  Company,  all
documents,  certificates,   instruments,   statements,  filings  and  agreements
("documents")  to be  filed  with  or  delivered  to  any  foreign  or  domestic
governmental  or regulatory body or required or requested by any other person or
entity  pursuant  to  any  legal  or  regulatory  requirement  relating  to  the
acquisition,  ownership,  management  or  disposition  of  securities  or  other
investments,  and any other documents relating or ancillary  thereto,  including
but not limited to, all  documents  relating to filings  with the United  States
Securities and Exchange Commission (the "SEC") pursuant to the Securities Act of
1933 or the  Securities  Exchange  Act of 1934  (the  "Act")  and the  rules and
regulations promulgated thereunder, including: (1) all documents relating to the
beneficial ownership of securities required to be filed with the SEC pursuant to
Section 13(d) or Section 16(a) of the Act including, without limitation: (a) any
acquisition  statements  on  Schedule  13D or  Schedule  13G and any  amendments
thereto,  (b) any joint filing agreements  pursuant to Rule 13d-1(f) and (c) any
initial  statements  of, or  statements of changes in,  beneficial  ownership of
securities  on Form 3, Form 4 or Form 5 and (2) any  information  statements  on
Form 13F required to be filed with the SEC pursuant to Section 13(f) of the Act.
All past acts of the attorney-in-fact in furtherance of the foregoing are hereby
ratified and confirmed.

This power of attorney  shall be valid from the date hereof until revoked by the
Company.

IN WITNESS  WHEREOF,  the Company has executed this  instrument this 25th day of
October, 1996.

                               WINSTON PARTNERS II LDC



                               By: /s/ Kieran Conroy  /s/ Wiekert Weber
                                   ------------------------------------
                                   Name: Kieran Conroy / Wiekert Weber



                                                             Page 32 of 34 Pages

                                    EXHIBIT E

                                  JOINT FILING

               The  undersigned  hereby agree that the statement on Schedule 13D
with respect to the Common Stock of Sepracor  Inc.  dated  November 10, 1997 is,
and any amendments  thereto signed by each of the undersigned shall be, filed on
behalf of each of us pursuant to and in accordance  with the  provisions of Rule
13d- 1(f) under the Securities Exchange Act of 1934.

Date:  November 10, 1997

                                   SOROS FUND MANAGEMENT LLC

                                   By:  /S/ MICHAEL C. NEUS
                                        ---------------------------------------
                                        Michael C. Neus
                                        Assistant General Counsel


                                   GEORGE SOROS

                                   By:  /S/ MICHAEL C. NEUS
                                        ---------------------------------------
                                        Michael C. Neus
                                        Attorney-in-Fact


                                   STANLEY F. DRUCKENMILLER

                                   By:  /S/ MICHAEL C. NEUS
                                        ---------------------------------------
                                        Michael C. Neus
                                        Attorney-in-Fact


                                   WINSTON PARTNERS, L.P.

                                   By:  Chatterjee Fund Management, L.P.,
                                        its General Partner

                                        By:  Purnendu Chatterjee,
                                             its General Partner

                                             By:  /S/ PETER HURWITZ
                                                  -----------------------------
                                                  Peter Hurwitz
                                                  Attorney-in-Fact



<PAGE>


                                                             Page 33 of 34 Pages


                                   CHATTERJEE FUND MANAGEMENT, L.P.

                                   By:  Purnendu Chatterjee,
                                        its General Partner

                                        By:  /S/ PETER HURWITZ
                                             ----------------------------------
                                             Peter Hurwitz
                                             Attorney-in-Fact


                                   WINSTON PARTNERS II LDC

                                   By:  /S/ PETER HURWITZ
                                        ----------------------------------
                                        Peter Hurwitz
                                        Attorney-in-Fact


                                   WINSTON PARTNERS II LLC

                                   By:  Chatterjee Advisors LLC, its Manager

                                        By:  /S/ PETER HURWITZ
                                             ----------------------------------
                                             Peter Hurwitz
                                             Manager


                                   CHATTERJEE ADVISORS LLC

                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Manager


                                   CHATTERJEE MANAGEMENT COMPANY

                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Vice President



<PAGE>


                                                             Page 34 of 34 Pages


                                   PURNENDU CHATTERJEE

                                   By:  /S/ PETER HURWITZ
                                        ---------------------------------------
                                        Peter Hurwitz
                                        Attorney-in-Fact




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