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                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM 10-K/A
                                (AMENDMENT NO. 1)

[X]    ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
       ACT OF 1934

                   FOR THE FISCAL YEAR ENDED DECEMBER 31, 2001

                                       OR

[ ]    TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
       EXCHANGE ACT OF 1934


                         COMMISSION FILE NUMBER: 0-20017
                         TEXAS BIOTECHNOLOGY CORPORATION
             (Exact name of Registrant as specified in its charter)


                       DELAWARE                     13-3532643
                      (State of                 (I.R.S. Employer
                    Incorporation)            Identification Number)

                             7000 FANNIN, 20TH FLOOR
                              HOUSTON, TEXAS 77030
                                 (713) 796-8822
   (Address and telephone number of principal executive offices and zip code)

        Securities Registered Pursuant to Section 12(b) of the Act: NONE

           Securities Registered Pursuant to Section 12(g) of the Act:

                                                 NAME OF EACH EXCHANGE
                   TITLE OF EACH CLASS            ON WHICH REGISTERED
           ---------------------------------    -----------------------
             Common Stock, $.005 par value      Nasdaq National Market
             Preferred Stock Purchase Rights    Nasdaq National Market


   Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes [X] No [ ]

   The approximate aggregate market value of voting stock held by nonaffiliates
of the registrant is $150,048,000 as of July 1, 2002.

   Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [X]

   The number of shares outstanding of each of the registrant's classes of
common stock as of July 1, 2002:

                             TITLE OF CLASS                     NUMBER OF SHARES
                    -------------------------------             ----------------
                     Common Stock, $.005 par value                  43,745,872

   Documents incorporated by reference:

                                DOCUMENT                         FORM 10-K PARTS
            ----------------------------------------------       ---------------
            Definitive Proxy Statement, to be filed within             III
                    120 days of December 31, 2001
                         (specified portions)

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                                     PART IV

ITEM 14 -- EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

   (a)   1. INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

         Reference is made to the Consolidated Financial Statements, the reports
      thereon, and the notes thereto commencing at Page F-1 of this Annual
      Report on Form 10-K. Set forth below is an index to such Financial
      Statements.

<Table>
<Caption>
                                                                           PAGE
                                                                           ----
                                                                        
          Independent Auditors' Report...................................  F-1

          Consolidated Balance Sheets....................................  F-2

          Consolidated Statements of Operations and Comprehensive Loss...  F-3

          Consolidated Statements of Stockholders' Equity................  F-4

          Consolidated Statements of Cash Flows..........................  F-6

          Notes to Consolidated Financial Statements.....................  F-7
</Table>

      2. FINANCIAL STATEMENT SCHEDULES

         Independent Auditors' Report

         Balance Sheets of ICOS-Texas Biotechnology L.P. (A Development Stage
         Limited Partnership) as of December 31, 2001 and 2000, and the related
         statements of operations, statements of partners' deficit and cash
         flows for the year ended December 31, 2001, the period from June 6,
         2000 (inception) through December 31, 2000 and the period from June 6,
         2000 (inception) through December 31, 2001, and notes thereto.

         All other schedules have been omitted since the information is not
         required or is not material to require submission of the schedule, or
         because the information is included in the financial statements or the
         notes thereto.

      3. INDEX TO EXHIBITS

         Information with respect to this Item is contained in the attached
      Index to Exhibits.

         The Company will furnish a copy of any one or more of these exhibits to
      a shareholder who so requests upon receipt of payment for the costs of
      duplication and mailing the requested item.


                                       2


  (b) REPORTS ON FORM 8-K

         One report on Form 8-K dated October 30, 2001 was filed during the
      quarter ended December 31, 2001, regarding the Company's third quarter
      2001 financial results, market growth for Argatroban and clinical trials
      status.

         Four reports on Form 8-K were filed after December 31, 2001 but prior
      to the filing of this Form 10-K. A report on Form 8-K dated January 3,
      2002 was filed regarding the issuance of rights under the Shareholder
      Rights Plan. A report on Form 8-K dated February 5, 2002 was filed
      regarding confirmation of the Company's 2001 guidance and a review of the
      outlook for 2002. A report on Form 8-K dated February 26, 2002 was filed
      regarding the Company's 2001 fourth quarter and year-end financial
      results. A report on Form 8-K dated March 21, 2002 was filed regarding
      Bruce D. Given, M.D. being named as President and CEO and the retirement
      of David B. McWilliams.

                                   SIGNATURES

   Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Registrant has duly caused this amendment to the
report to be signed on its behalf by the undersigned, thereunto duly authorized,
in the City of Houston and State of Texas on the 8th day of July, 2002.

                                     TEXAS BIOTECHNOLOGY CORPORATION

                                     By:  /s/ STEPHEN L. MUELLER
                                     -------------------------------------------
                                     Stephen L. Mueller
                                     Vice President, Finance and Administration,
                                     Secretary and Treasurer


                                       3

  (d) FINANCIAL STATEMENTS OF 50-PERCENT-OR-LESS OWNED PERSONS



                         ICOS - TEXAS BIOTECHNOLOGY L.P.
                    (A DEVELOPMENT STAGE LIMITED PARTNERSHIP)



                                TABLE OF CONTENTS


<Table>
<Caption>
                                                                                 PAGE
                                                                              
Independent Auditors' Report                                                       2

Balance Sheets as of December 31, 2001 and 2000                                    3

Statements of Operations for the year ended December 31, 2001, the period
   from June 6, 2000 (inception) through December 31, 2000 and the period
   from June 6, 2000 (inception) through December 31, 2001                         4

Statements of Partners' Deficit for the year ended December 31, 2001 and
   the period from June 6, 2000 (inception) through December 31, 2000              5

Statements of Cash Flows for the year ended December 31, 2001, the period
   from June 6, 2000 (inception) through December 31, 2000 and the period
   from June 6, 2000 (inception) through December 31, 2001                         6

Notes to Financial Statements                                                    7-9
</Table>


                                       4



                        ICOS - TEXAS BIOTECHNOLOGY L.P.
                   (A DEVELOPMENT STAGE LIMITED PARTNERSHIP)

                              Financial Statements

                           December 31, 2001 and 2000

                  (With Independent Auditors' Report Thereon)


                                       1

                          INDEPENDENT AUDITORS' REPORT



The Board of Directors
ICOS - Texas Biotechnology L.P.:


We have audited the accompanying balance sheets of ICOS - Texas Biotechnology
L.P. (a development stage limited partnership) as of December 31, 2001 and 2000,
and the related statements of operations, partners' deficit and cash flows for
the year ended December 31, 2001, the period from June 6, 2000 (inception) to
December 31, 2000, and the period from June 6, 2000 (inception) to December 31,
2001. These financial statements are the responsibility of the Partnership's
management. Our responsibility is to express an opinion on these financial
statements based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States of America. Those standards require that we plan and
perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements. An audit also includes assessing the accounting principles used and
significant estimates made by management, as well as evaluating the overall
financial statement presentation. We believe that our audits provide a
reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of ICOS - Texas Biotechnology L.P.
as of December 31, 2001 and 2000, and the results of its operations and its cash
flows for the year ended December 31, 2001, the period from June 6, 2000
(inception) to December 31, 2000, and the period from June 6, 2000 (inception)
to December 31, 2001, in conformity with accounting principles generally
accepted in the United States of America.

The accompanying financial statements have been prepared assuming that ICOS -
Texas Biotechnology L.P. will continue as a going concern. As discussed in note
6 to the financial statements, ICOS - Texas Biotechnology L.P. has experienced
recurring losses from operations and has a partners' deficit which raise
substantial doubt about its ability to continue as a going concern. Management's
plans in regard to these matters are also described in note 6. The financial
statements do not include any adjustments that might result from the outcome of
this uncertainty.



KPMG LLP
Seattle, Washington
January 23, 2002


                                       2

                         ICOS - TEXAS BIOTECHNOLOGY L.P.
                    (A DEVELOPMENT STAGE LIMITED PARTNERSHIP)

                                 BALANCE SHEETS

<Table>
<Caption>
                                                                      (in thousands)
                                                                 -------------------------
                                                                        December 31,
                                                                 -------------------------
                                                                    2001           2000
                                                                 ----------     ----------
                                                                          
                            ASSETS

Current assets:
    Cash                                                         $        1     $       21
    Receivable from Texas Biotechnology Corporation                      --            470
                                                                 ----------     ----------
                                                                 $        1     $      491
                                                                 ==========     ==========


               LIABILITIES AND PARTNERS' DEFICIT

Current liabilities - accrued expenses payable to partners       $    7,059     $    3,397

Partners' deficit:
    General partner interests:
      ICOS-ET-GP LLC                                                    (30)            (7)
      TBC-ET, Inc.                                                      (30)            (7)
    Limited partner interests:
      ICOS-ET-LP LLC                                                 (3,499)        (1,446)
      Texas Biotechnology Corporation                                (3,499)        (1,446)
                                                                 ----------     ----------
        Total partners' deficit                                      (7,058)        (2,906)
                                                                 ----------     ----------
                                                                 $        1     $      491
                                                                 ==========     ==========
</Table>


                 See accompanying notes to financial statements.


                                       3

                         ICOS - TEXAS BIOTECHNOLOGY L.P.
                    (A DEVELOPMENT STAGE LIMITED PARTNERSHIP)

                            STATEMENTS OF OPERATIONS


<Table>
<Caption>
                                                                                (in thousands)
                                                        ----------------------------------------------------------------
                                                                            Period from               Period from
                                                         Year ended   June 6, 2000 (inception)  June 6, 2000 (inception)
                                                        December 31,    through December 31,       through December 31,
                                                            2001                2000                      2001
                                                        ------------  ------------------------  ------------------------
                                                                                              
Revenue                                                 $        --          $       547               $       547

Operating expenses:
  Development - contributed technology
    license from Texas Biotechnology Corporation              4,000                4,000                     8,000
  Development - Texas Biotechnology Corporation               6,190                4,706                    10,896
  Development - ICOS Corporation                             12,682                2,809                    15,491
  General and administrative                                     26                    8                        34
                                                        -----------          -----------               -----------
    Total operating expenses                                 22,898               11,523                    34,421
                                                        -----------          -----------               -----------
Net loss                                                $   (22,898)         $   (10,976)              $   (33,874)
                                                        ===========          ===========               ===========
</Table>


                See accompanying notes to financial statements.


                                       4

                         ICOS - TEXAS BIOTECHNOLOGY L.P.
                    (A DEVELOPMENT STAGE LIMITED PARTNERSHIP)

                         STATEMENTS OF PARTNERS' DEFICIT


<Table>
<Caption>
                                                                       (in thousands)
                                          ------------------------------------------------------------------------------
                                                                                        Texas Biotechnology   Partners'
                                          ICOS-ET-GP LLC  TBC-ET, Inc.  ICOS-ET-LP LLC      Corporation        Deficit
                                          --------------  ------------  --------------  -------------------  -----------
                                                                                              
Balances at June 6, 2000 (inception)        $       --     $       --    $        --       $        --       $       --
Partner contributions:
  Cash                                               4              4          4,031             2,031            6,070
  Technology license                                --             --             --             4,000            4,000
Capital distribution                                --             --             --            (2,000)          (2,000)
Net loss                                           (11)           (11)        (5,477)           (5,477)         (10,976)
                                            ----------     ----------    -----------       -----------       ----------
Balances at December 31, 2000                       (7)            (7)        (1,446)           (1,446)          (2,906)
Partner contributions:
  Cash                                              --             --          9,373             7,373           16,746
  Technology license                                --             --             --             4,000            4,000
Capital distribution                                --             --             --            (2,000)          (2,000)
Net loss                                           (23)           (23)       (11,426)          (11,426)         (22,898)
                                            ----------     ----------    -----------       -----------       ----------
Balances at December 31, 2001               $      (30)    $      (30)   $    (3,499)      $    (3,499)      $   (7,058)
                                            ==========     ==========    ===========       ===========       ==========
</Table>


                See accompanying notes to financial statements.


                                       5

                         ICOS - TEXAS BIOTECHNOLOGY L.P.
                    (A DEVELOPMENT STAGE LIMITED PARTNERSHIP)

                            STATEMENTS OF CASH FLOWS
<Table>
<Caption>
                                                                                            (in thousands)
                                                                  ------------------------------------------------------------------
                                                                                       Period from                Period from
                                                                   Year ended    June 6, 2000 (inception)   June 6, 2000 (inception)
                                                                  December 31,     through December 31,       through December 31,
                                                                      2001                2000                       2001
                                                                  ------------   ------------------------   ------------------------
                                                                                                        
Cash flows from operating activities:
    Net loss                                                       $   (22,898)        $   (10,976)              $   (33,874)
    Adjustments to reconcile net loss to net cash used in
      operating activities:
        Contributed technology license                                   4,000               4,000                     8,000
        Change in operating assets and liabilities:
            Receivable from Texas Biotechnology Corporation                470                (470)                       --
            Accrued expenses payable to partners                         3,662               3,397                     7,059
                                                                   -----------         -----------               -----------

               Net cash used in operating activities                   (14,766)             (4,049)                  (18,815)
                                                                   -----------         -----------               -----------
Cash flows from financing activities:
    Partner contributions                                               16,746               6,070                    22,816
    Capital distributions                                               (2,000)             (2,000)                   (4,000)
                                                                   -----------         -----------               -----------
               Net cash provided by financing activities                14,746               4,070                    18,816

               Net increase (decrease) in cash                             (20)                 21                         1

Cash at beginning of period                                                 21                  --                        --
                                                                   -----------         -----------               -----------
Cash at end of period                                              $         1         $        21               $         1
                                                                   ===========         ===========               ===========
</Table>


                 See accompanying notes to financial statements.


                                       6

                         ICOS - TEXAS BIOTECHNOLOGY L.P.
                    (A DEVELOPMENT STAGE LIMITED PARTNERSHIP)
                          Notes to Financial Statements

                           December 31, 2001 and 2000
                 (Dollars in thousands, unless otherwise noted)



(1)  ORGANIZATION AND BUSINESS OPERATIONS

     ICOS-Texas Biotechnology L.P. (the "Partnership"), is a development stage
     limited partnership that was formed on June 6, 2000 by Texas Biotechnology
     Corporation, a Delaware corporation ("TBC"), and ICOS-ET-LP LLC, a
     Washington limited liability company ("ICOS-LP"), as limited partners, and
     TBC-ET, Inc., a Delaware corporation ("TBC-GP"), and ICOS-ET-GP LLC, a
     Washington limited liability company ("ICOS-GP"), as general partners. The
     Partnership was organized to develop and globally commercialize endothelin
     receptor antagonists. The Partnership is managed jointly by TBC-GP and
     ICOS-GP. Profits, losses and distributions, except for distributions for
     payment of TBC's exclusive license (see note 3), are allocated based on
     respective ownership interests. ICOS Corporation ("ICOS") is the sole
     member of both ICOS-LP and ICOS-GP. Both TBC and ICOS provide the
     Partnership with research and development services.

(2)  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     (a) USE OF ESTIMATES IN THE PREPARATION OF FINANCIAL STATEMENTS

         The preparation of financial statements in conformity with accounting
         principles generally accepted in the United States of America requires
         management to make estimates and assumptions that affect the reported
         amounts of assets and liabilities, disclosure of contingent assets and
         liabilities at the date of the financial statements and the reported
         amounts of revenues and expenses during the reporting period. Actual
         results could differ from those estimates.

     (b) REVENUE RECOGNITION

         Revenue represents research payments received by TBC, which were
         assigned to the Partnership and recognized as the related services were
         performed.

     (c) RESEARCH AND DEVELOPMENT COSTS

         Research and development costs are expensed as incurred.

     (d) INCOME TAXES

         No Federal income tax expense or benefit is included in the financial
         statements since such taxes, if any, are payable or recoverable by each
         partner.

     (e) OPERATING SEGMENTS

         The Partnership has one operating segment, the development and
         commercialization of endothelin receptor antagonist products for human
         therapeutic use.


                                       7

                        ICOS - TEXAS BIOTECHNOLOGY L.P.
                    (A DEVELOPMENT STAGE LIMITED PARTNERSHIP)
                          Notes to Financial Statements

                           December 31, 2001 and 2000
                 (Dollars in thousands, unless otherwise noted)


 (3) EQUITY TRANSACTIONS

     TBC made an initial capital contribution to the Partnership of an exclusive
     worldwide license of intellectual property associated with endothelin
     receptor antagonists, including patent rights and technical information,
     and ICOS-LP made an initial capital contribution to the Partnership of $2
     million in cash. In exchange for their contributions, each party received a
     49.9% limited partnership interest in the Partnership. ICOS-GP and TBC-GP
     each contributed $4 in exchange for a .1% general partnership interest in
     the Partnership.

     The technology license contributed to the Partnership by TBC was initially
     valued at $4 million, based on the cash contribution from ICOS-LP and the
     concurrent capital distribution to TBC discussed below. The contributed
     valuation of the technology license increased by $4 million in 2001, upon
     the achievement of certain development objectives, and may increase by up
     to $103 million in the future, if certain additional milestones are
     achieved as provided for in the Agreement of Limited Partnership of
     ICOS-Texas Biotechnology L.P. (the "Agreement").

     Under the terms of the Agreement, TBC received a capital distribution of $2
     million in conjunction with formation of the Partnership and received an
     additional $2 million capital distribution in October 2001 upon the
     achievement of certain development objectives. TBC may receive up to $51.5
     million in further milestone-related capital distributions based on the
     achievement of certain other objectives as specified in the Agreement. Any
     such capital distributions are required to be funded by additional capital
     contributions from ICOS-LP.

 (4) LICENSE AGREEMENTS

     In connection with TBC's initial capital contribution, the Partnership
     entered into an Endothelin License Agreement with TBC, subject to the
     rights of an agreement with LG Chemical, Ltd. discussed below. Under the
     Endothelin License Agreement, the Partnership received an exclusive right
     and license to certain proprietary patent rights, technical information,
     technology and know-how relating to, and useful in, the manufacture,
     production and worldwide commercial sale of endothelin products for human
     therapeutic use. The value of the license was charged to development
     expense as the underlying technology represented incomplete product
     research and development.

     In October 1996, TBC entered into a Strategic Alliance Agreement with LG
     Chemical, Ltd. ("LG Chem"), a Korean corporation, (the "LG Chem
     Agreement"), pursuant to which TBC granted LG Chem certain technology
     rights and agreed to perform certain research and development activities on
     behalf of LG Chem in exchange for the right to receive research and royalty
     payments in the future.

     In conjunction with its formation, the Partnership was assigned and assumed
     certain of TBC's rights and obligations under the LG Chem Agreement. During
     2000, the Partnership recognized $547 in revenue associated with services
     performed under the LG Chem Agreement, of which $470 was due from TBC at
     December 31, 2000, which was collected in 2001. The LG Chem Agreement was
     terminated during 2001. The Partnership will not recognize any further
     revenue or receive any additional payments under the LG Chem Agreement.


                                       8

                        ICOS - TEXAS BIOTECHNOLOGY L.P.
                    (A DEVELOPMENT STAGE LIMITED PARTNERSHIP)
                          Notes to Financial Statements

                           December 31, 2001 and 2000
                 (Dollars in thousands, unless otherwise noted)


(5)  RESEARCH AND DEVELOPMENT SERVICE AGREEMENT

     In June 2000, the Partnership entered into a Research and Development
     Service Agreement (the "R&D Agreement") with TBC and ICOS, pursuant to
     which TBC and ICOS agreed to provide research and development services for,
     and on behalf of, the Partnership. The Partnership reimburses TBC and ICOS,
     at a per-hour amount, calculated on the basis of actual hours incurred by
     TBC and ICOS, plus certain development and administrative expenses. There
     is no minimum commitment for research and development, and the Partnership
     can contract with other parties to provide research and development
     services.

(6)  FINANCING

     Pursuant to the Agreement, ongoing activities of the Partnership are to be
     funded by the limited partners in relation to their limited partnership
     interests. At December 31, 2001, the Partnership had a partners' deficit of
     $7.1 million. To continue operations, the Partnership will need to obtain
     additional financing from the partners or other sources. However, there is
     no assurance that the partners will provide adequate financing to fund the
     Partnership, or that additional funding will be available from other
     sources. If additional funds are not available, the Partnership will be
     required to delay, reduce, or eliminate its research and development
     programs.


                                       9

                                INDEX TO EXHIBITS


<Table>
<Caption>
  EXHIBIT NO                  DESCRIPTION OF EXHIBIT
  ----------                  ----------------------
                     
    23.1+               -- Independent Auditors' Consent
    23.2+               -- Independent Auditors' Consent
</Table>

- ---------------
  +  Filed herewith