TEXAS BIOTECHNOLOGY CORP /DE/
10-K, 1999-03-30
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 10-K

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

                   For the Fiscal Year Ended December 31, 1998

                                       or

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

                         Commission File Number: 1-12574


                         TEXAS BIOTECHNOLOGY CORPORATION
             (Exact name of Registrant as specified in its charter)


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

                             7000 Fannin, Suite 1920
                              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:

                                                          Name of Each Exchange
        Title of Each Class                                on Which Registered
        -------------------                                -------------------

     Common Stock, $.005 par value                      American Stock Exchange
Redeemable common stock purchase warrants               American Stock Exchange

           Securities registered pursuant to Section 12(g) of the Act:
                                      None

       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 $169,433,000 as of March 19, 1999.

       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. [ ]

       The number of shares outstanding of each of the registrant's classes of
common stock as of March 19, 1999:

                  Title of Class                              Number of Shares
                  --------------                              ----------------

            Common Stock, $.005 par value                         34,189,364

       Documents incorporated by reference:

                     Document                                 Form 10-K Parts
                     --------                                 ---------------

  Definitive Proxy Statement, to be filed within 120 days of        III
            December 31, 1998 (specified portions)

================================================================================

<PAGE>   2

                 DISCLOSURE REGARDING FORWARD LOOKING STATEMENTS

This Report includes "forward looking statements" within the meaning of Section
27A of the Securities Act of 1933, as amended (the "Securities Act") and Section
21E of the Securities Exchange Act of 1934, as amended. All statements other
than statements of historical fact included in this Report are forward looking
statements. Such forward looking statements include, without limitation,
statements under (a) "Business" regarding Texas Biotechnology Corporation's
expectations for future drug discovery and development and related expenditures
and (b) "Management's Discussion and Analysis of Financial Condition and Results
of Operations - Liquidity and Capital Resources" regarding TBC's estimate of
sufficiency of existing capital resources and its ability to raise additional
capital to fund cash requirements for future operations. Although TBC believes
that the expectations reflected in such forward looking statements are
reasonable, it can give no assurance that such expectations reflected in such
forward looking statements will prove to have been correct. The ability to
achieve TBC's expectations is contingent upon a number of factors which include
(i) ongoing cost of research and development activities, (ii) cost of clinical
development of product candidates, (iii) attainment of research and clinical
goals of product candidates, (iv) timely approval of TBC's product candidates by
appropriate governmental and regulatory agencies, (v) effect of any current or
future competitive products, (vi) ability to manufacture and market products
commercially, (vii) retention of key personnel and (viii) capital market
conditions.

This Form 10-K may contain trademarks and service marks of other companies.

                                     PART I

ITEM 1.  BUSINESS

     Texas Biotechnology Corporation ("TBC" or the "Company"), a
biopharmaceutical company, applies innovative drug discovery techniques and its
specialized knowledge of the role of vascular cell biology in vascular diseases
to the design and development of novel pharmaceutical compounds. The Company's
research and development programs are currently focused on inhibitors (also
referred to as antagonists or blockers) of thrombosis, vasospasm/hypertension,
vascular inflammation, vascular proliferative disease, angiogenesis and
apoptosis. The Company was incorporated in Delaware in August 1989 under the
name Cardiology Institute of Texas, Ltd., and its name was changed to Texas
Biotechnology Corporation in October 1990. As of December 31, 1998, the Company
had 84 employees, 69 of whom were engaged in research and development.
References to TBC or the Company include its subsidiary ImmunoPharmaceutics,
Inc. ("IPI") unless otherwise indicated. The Company's research laboratories and
executive offices are located at 7000 Fannin, Suite 1920, Houston, Texas 77030,
(713) 796-8822.

     The Company's lead product candidate is NOVASTAN(R), a direct thrombin
inhibitor that is being developed for various indications as an anticoagulant
alternative to heparin. Approximately 390,000 patients treated with heparin in
the U.S. annually develop the immunological reaction known as heparin induced
thrombocytopenia ("HIT") syndrome, which may lead to a potentially
life-threatening thrombosis (blood clot). The Company has initially focused on
the therapeutic and commercial potential of NOVASTAN(R) in this indication.
NOVASTAN(R) is marketed in Japan for ischemic stroke, peripheral arterial
occlusion and hemodialysis in patients with antithrombin III deficiency.
Approximately 164,000 patients have been treated with NOVASTAN(R) in Japan since
its introduction in 1990. TBC has licensed the U.S. and Canadian rights to
NOVASTAN(R) from Mitsubishi Chemical Corporation ("Mitsubishi"). The Company has
entered into a collaboration with SmithKline Beecham plc ("SmithKline")
regarding the commercialization and development of NOVASTAN(R).

The original New Drug Application ("NDA") for NOVASTAN(R) was filed in August
1997, and was granted priority review status. The United States ("U.S.") Food
and Drug Administration (the "FDA") extended the priority review period by 90
days during January, 1998. On May 11, 1998, the Company announced that it had
received a non-approvable letter from the FDA for NOVASTAN(R). The Company
amended its NDA with the FDA for NOVASTAN(R) (argatroban) as an anticoagulant
for use in patients with HIT syndrome on March 19, 1999. While the Company
believes the amendment includes consistent, positive results and supports the
use of NOVASTAN(R) in its proposed indication, the Company cannot predict the
timing or outcome of the FDA decision.



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<PAGE>   3
     TBC's internal research has produced several small molecule product
candidates in the areas of vasospasm, hypertension and vascular inflammation.
The Company's lead compound for the treatment of CHF is TBC11251, a synthetic
small molecule receptor antagonist that selectively blocks endothelinA receptors
which are believed to be associated with vasoconstriction (constriction of blood
flow through blood vessels). In the area of vascular inflammation (associated
with asthma, reperfusion injury, or psoriasis), the Company has identified
several compounds, including TBC1269, which in preclinical studies have shown
efficacy in inhibiting acute inflammation. The Company completed its initial
Phase IIa clinical trial for TBC11251 (TBC's lead endothelinA receptor
antagonist ("ETA") compound for vasospasm/hypertension) in congestive heart
failure ("CHF"). In treatment of patients with moderate to severe congestive
heart failure, with intravenous TBC11251, the treated group demonstrated a
statistically significant improvement versus placebo in the primary objective of
improving central hemodynamics, particularly pulmonary artery pressure. In
addition, positive trends were observed in other important cardiovascular
measures. These results will allow the Company to proceed with the program using
oral dosing regimes in additional Phase II studies. The Company also completed a
Phase IIa clinical trial for TBC1269 (TBC's lead selectin antagonist compound
for vascular inflammation) in acute asthma. The trial demonstrated statistically
significant improvement over placebo as measured by reducing eosinophil
recruitment. The Company is currently developing inhaled and topical
formulations of TBC1269 for clinical testing in asthma and psoriasis,
respectively.

     Additionally, in the vascular inflammation area, the Company has identified
vascular cell adhesion molecule ("VCAM") antagonists for the intercellular
adhesion observed in atherosclerosis, asthma and rheumatoid arthritis, and is
continuing to optimize lead VCAM compounds to obtain a clinical candidate. The
Company is conducting research in the vascular proliferative disease area (which
can result in coronary restenosis after angioplasty) to identify antagonists
that block fibroblast growth factor ("FGF"), a protein which triggers growth of
smooth muscle cells in blood vessels. The Company is also conducting research
into treatments for the consequences of excess angiogenesis (the formation of
new blood vessels from pre-existing blood vessels) and apoptosis (programmed
cell death). The Company has identified a number of compounds which are
undergoing further optimization prior to selection of clinical candidates.

     The TBC strategy is to identify proprietary candidates for targeted
indications, and to selectively commercialize those candidates through
collaborations with other pharmaceutical and biotechnology companies. The
Company has also entered into collaborations with Synthelabo S.A., the
pharmaceutical division of L'Oreal S.A. ("Synthelabo"), and LG Chemical, Ltd.
("LG Chemical") regarding other compounds, as described below. In the future,
the Company intends to directly commercialize its compounds for acute
indications by establishing a hospital-based sales force, and intends to
out-license the compounds in territories outside its targeted markets, as well
as the rights to any non-strategic use of its compounds.



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                      PRODUCTS IN DEVELOPMENT AND RESEARCH

         The following table summarizes the potential indications and the
current status of TBC's compounds in development and research. A more detailed
description of these compounds follows the table.

                                COMPOUND PIPELINE

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------
                    TARGET COMPOUND/                                        CORPORATE                         
    PROGRAM             DOSE FORM             POTENTIAL INDICATION          PARTNERS            STATUS(1)
- ----------------  ------------------  --------------------------------   -------------------  ----------------
<S>               <C>                 <C>                                <C>                  <C>
THROMBOSIS        NOVASTAN(R)

                  Intravenous         Anticoagulant Therapy in HIT       Mitsubishi &         NDA Filed (2)
                                      patients                           SmithKline Beecham

                  Intravenous                                            Mitsubishi &         Phase III
                                      Anticoagulant Therapy in HIT       SmithKline Beecham
                                      patients undergoing angioplasty

- --------------------------------------------------------------------------------------------------------------
VASOSPASM/        ENDOTHELIN(A)
HYPERTENSION      RECEPTOR
                  ANTAGONIST

                  TBC11251
                  Intravenous         Congestive Heart Failure              LG Chemical       Phase II
                  Oral                Congestive Heart Failure              LG Chemical       Phase I
                                      Hypertension                          LG Chemical       Phase II (3)

                  TBC3214
                  Oral                Primary Pulmonary Hypertension                          Preclinical
                                      Congestive Heart Failure                                Preclinical
                                      Hypertension                                            Preclinical

- --------------------------------------------------------------------------------------------------------------
VASCULAR          SELECTIN
INFLAMMATION      ANTAGONIST

                  TBC1269
                       Intravenous    Asthma                                 LG Chemical      Phase II
                       Inhaled        Asthma                                 LG Chemical      Preclinical
                       Topical        Psoriasis                              LG Chemical      Preclinical

                  VCAM/VLA-4

                  TBC3486
                       Inhaled        Asthma                                                  Research
                       Oral           Rheumatoid Arthritis                                    Research

- --------------------------------------------------------------------------------------------------------------
VASCULAR          FGF ANTAGONIST      Coronary Restenosis Post-Angioplasty    Synthelabo      Research
PROLIFERATIVE                          
DISEASE

- --------------------------------------------------------------------------------------------------------------
ANGIOGENESIS      VEGF ANTAGONIST     Diabetic Retinopathy                                    Research
                                      Cancer                                                  Research

- --------------------------------------------------------------------------------------------------------------
APOPTOSIS         TNF(alpha)          Rheumatoid Arthritis                                    Research
                  ANTAGONIST
                  CASPASE INHIBITOR   Stroke                                                  Research
                                      Acute Myocardial Infarction                             Research
</TABLE>

(1)      See "Government Regulation."

(2)      The original NDA was filed in August 1997, and was granted priority
         review status. The FDA extended the priority review period by 90 days
         during January, 1998. On May 11, 1998, the Company announced that it
         had received a non-approvable letter from the FDA for NOVASTAN(R). The
         Company amended its NDA on March 19, 1999. See "Thrombosis Program".

(3)      Phase II clinical trials are anticipated to commence during 1999.



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<PAGE>   5


                               THROMBOSIS PROGRAM

     Background. Thrombosis is the formation of a blood clot in a vessel that
causes various vascular diseases depending on the location of the clot. An
arterial clot may lead to heart attack if lodged in a coronary artery, or to
stroke if lodged in an artery that supplies oxygen to the brain. Venous clots
occur principally in the arms or legs (deep vein thrombosis), and may cause
local inflammation, chronic pain and other complications. In some cases, a
venous clot can cause lung injury (pulmonary embolism) by migrating from the
veins to the lungs.

     Thrombosis can be treated with anticoagulants, thrombolytic drugs or
surgically. Anticoagulant drugs, which prevent clots from forming, are
characterized as either antithrombotic or antiplatelet drugs. Antithrombotic
drugs block the action of the blood protein thrombin and may be used to treat
both arterial and venous clots. Antiplatelet drugs prevent platelets from
clumping together and are only effective in treating arterial clots. Heparin and
aspirin are the most widely-used antithrombotic and antiplatelet drugs,
respectively. Thrombolytic drugs dissolve existing clots in veins or arteries,
but do not block the formation of new blood clots. Tissue plasminogen activator
("t-PA") and streptokinase ("SK") are two of the most commonly used thrombolytic
drugs. A combination of an anticoagulant and a thrombolytic often achieves the
best therapeutic effect.

     Heparin, first discovered over 80 years ago, is the most widely used
injectable anticoagulant. In the U.S., approximately ten million patients
annually receive therapeutic heparin to treat a variety of conditions that
require inhibition of the body's natural clotting mechanism. Each year
approximately 390,000 patients develop a profound immunological reaction to
heparin which is known as HIT. This reaction may lead to a potentially life
threatening thrombosis (blood clot).

     Product Candidate - NOVASTAN(R). TBC's lead compound, NOVASTAN(R), is a
non-protein, synthetic small molecule thrombin inhibitor that directly and
selectively binds to and inactivates thrombin in the blood plasma. NOVASTAN(R)
is also effective against thrombin that is bound in blood clots. NOVASTAN(R) is
manufactured and marketed in Japan by Mitsubishi where it is approved for the
treatment of ischemic stroke, peripheral arterial occlusion and hemodialysis in
patients with antithrombin III deficiency. Since introduction in 1990,
approximately 164,000 patients have been treated with NOVASTAN(R) in Japan. TBC
is developing NOVASTAN(R) as an anticoagulant alternative to heparin for the
U.S. and Canadian markets in conjunction with SmithKline. See "-- Research and
Development Collaborations and Licensing Agreements."

     In studies conducted by TBC in the U.S., as well as by Mitsubishi in Japan
and Synthelabo in Europe, a significant correlation was identified between the
administered dose of NOVASTAN(R) and the degree of anticoagulation achieved.
Moreover, these studies suggest that the relationship between dose and effect
may be generally predictable over the expected dose-range. As a result, the
Company believes the risk of either insufficient or excessive anticoagulation
associated with small dose changes, as is the case with heparin, should be
reduced. TBC further believes that NOVASTAN(R) could have a superior profile, as
compared with heparin, for efficacy, ease of dosing, speed of achieving
"therapeutic anticoagulation", risk of bleeding and total economic costs of
anticoagulation.

     Indication - HIT/HITTS. Because NOVASTAN(R) does not evoke the immune
reaction caused by heparin, the Company believes it should provide a safe and
effective anticoagulant for patients diagnosed with HIT. The Company conducted a
multicenter Phase III study ("ARG-911") that compared 304 patients treated with
NOVASTAN(R) for up to 14 days (160 with HIT and 144 with HIT with thrombosis
syndrome ("HITTS"), with 217 historical control patients. The Company submitted
this trial as part of an NDA on August 15, 1997 and was granted priority review
status. The FDA extended the priority review period by 90 days during January
1998. On May 11, 1998 the Company announced that it had received a
non-approvable letter from the FDA. Based on consultation with representatives
from the FDA, TBC has focused on the collection and analysis of a new more
comparable historical control group as the basis for demonstrating NOVASTAN(R)'s
safety and efficacy. The new historical control includes 193 patients, which
were collected according to a predetermined methodology from the centers that
enrolled the NOVASTAN(R) patients. The amended NDA includes one Phase III
clinical trial involving 304 treated patients and a second follow on supporting
trial involving 263 patients. Both of the Phase III studies were 




                                       4
<PAGE>   6

comparable with regard to study design, primary and secondary endpoints and
dosing regimen. Both trials were compared to the 193 newly collected historical
control patients. The Company amended its NDA with the FDA for NOVASTAN(R) as an
anticoagulant for use in patients with HIT syndrome on March 19, 1999. While the
Company believes the amendment includes consistent, positive results and
supports the use of NOVASTAN(R) in its proposed indication, the Company cannot
predict the timing or outcome of the FDA decision.

     Other Indications. TBC has completed the clinical trials to support the
potential use of NOVASTAN(R) in patients undergoing angioplasty. TBC and
SmithKline intend to submit a supplemental NDA to the FDA following the FDA
decision on the primary indication. TBC is currently considering the development
of NOVASTAN(R) for additional indications. NOVASTAN(R) has been tested for use
as an adjunctive to thrombolytic therapy for acute myocardial infarction
("AMI"). The compound was found to be safe and as effective as heparin for this
indication. NOVASTAN(R) is approved in Japan for ischemic stroke. TBC is
evaluating the feasibility of development of NOVASTAN(R) for stroke and possibly
AMI.

                         VASOSPASM/HYPERTENSION PROGRAM

     Background. Smooth muscle cells in the blood vessel, via a series of
biochemical and morphological events, are directly responsible for mediating
changes in vessel diameter. The regulation of blood flow depends on a delicate
balance between physical and chemical stimuli that cause smooth muscle cells to
relax (vasodilate) or contract (vasoconstrict). Chronic periods of excessive
vasoconstriction in the peripheral circulation can lead to disturbances in blood
pressure (hypertension) or heart function (congestive heart failure), whereas
acute episodes of intense vasoconstriction (vasospasm) can restrict blood flow
and lead to severe tissue damage and loss of function (myocardial infarction or
kidney failure). An essential component of blood vessels is the vascular
endothelium-the cells comprising the innermost lining of all blood vessels.
Recently, it has been determined that the vascular endothelium plays a pivotal
role in maintaining normal blood vessel tone, including blood flow, by producing
substances that regulate the balance between vasodilation and vasoconstriction.

     Endothelins are a family of three peptides that are believed to play a
critical role in the control of blood flow. It has been determined that this
multiplicity of endothelin actions on different cell types can be explained by
endothelins' interactions with two distinct receptors, ETA and ETB, on cell
surfaces. In general, ETA receptors are associated with vasoconstriction and
disorders of the cardiovascular and renal systems, while ETB receptors are
primarily associated with vasodilation and disorders of the central nervous
system. There is substantial evidence that endothelins are involved in a variety
of diseases where blood flow is important. These include vasospasm, myocardial
infarction, congestive heart failure, renal disease, subarachnoid hemorrhage and
certain types of hypertension.

     Product Candidate - TBC11251. The Company's research program in the
vasospasm/hypertension area is aimed at developing small molecules that inhibit
the binding of ET to its cell surface receptors. The Company believes that
specific agents for each receptor subtype may provide the best clinical utility
and safety. The Company's initial focus has been to develop a highly potent and
selective small-molecule based ETA receptor antagonist. An antagonist (or
inhibitor) blocks the effects of a ligand at its receptor. A ligand is a
chemical messenger which binds to a specific site on a target molecule or cell.
TBC scientists have discovered a novel class of low molecular weight compounds
(molecular weight of less than 500 daltons) that antagonize ET binding to the
ETA receptor with high potency (these compounds block ET binding at low compound
concentration). The Company identified lead compounds which mimicked the ability
of ET to bind to the ETA receptor. Further optimization was then used to develop
more potent compounds until the current series of leads was identified. In
addition to their ability to block receptor binding, these compounds
functionally inhibit ET action on isolated blood vessels in vitro acting as
full, competitive antagonists. The lead compounds in this series have been shown
to exhibit in vivo efficacy using various animal models.

     TBC11251, a selective ETA inhibitor, has been identified as the Company's
lead compound in this program. The Company believes that a substantial market
opportunity for TBC11251 exists for the treatment of CHF, which is currently
estimated to affect approximately five million people in the U.S. annually. TBC
filed an investigational new drug application ("IND") with the FDA for TBC11251
in late 1996 and has completed the first of its planned Phase II clinical
trials, which was terminated early due to the achievement of statistical
significance with only 24 of 




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the planned 45 patients. The Company is considering additional Phase II studies
using additional dosing regimens. In treatment of patients with moderate to
severe CHF, the TBC11251 treated group demonstrated a statistically significant
improvement verses placebo in the primary objective of improving central
hemodynamics, particularly pulmonary artery pressure. In addition, positive
trends were observed in other important cardiovascular measures. These results
will allow the Company to proceed with the program using additional dosing
regimens. The Company also completed Phase I clinical trials with the oral form
of TBC11251. The Company anticipates commencing a Phase II clinical trial during
1999 with the oral formulation of TBC11251 in hypertension.

     Other Indications. The Company believes endothelin antagonist compounds may
have other indications. For example, an endothelin antagonist may be used to
treat chronic obstructive pulmonary disease, primary and secondary pulmonary
hypertension, systemic hypertension and prostate cancer. The Company may
consider licensing certain indications to third parties, although no assurance
can be given that the Company will be successful in entering into any such
license.

                          VASCULAR INFLAMMATION PROGRAM

     Background. Inflammation is the body's natural defense mechanism that fends
off bacterial, viral and parasitic infections. The inflammatory response
involves a series of events by which the body attempts to limit or destroy an
injurious agent. These steps include the production of proteins that attract
white blood cells, or leukocytes, to the site of inflammation, the production of
chemicals to destroy the injurious agent and the removal of the resulting
debris. This process is normally self-limiting and not harmful to the
individual. However, in certain instances, the process may be overly active, as
during an acute inflammatory reaction leading to a build up of white blood cells
and debris at the inflammation site that causes tissue damage.

     The initial interaction between white blood cells and the endothelial cell
layer is mediated by a group of adhesion molecules known as selectins. The
selectins are a family of three proteins, two of which are found on inflamed
endothelium, which bind to the carbohydrate sialyl Lewis x (sLex) found on the
surface of white blood cells. White blood cells are able to migrate into
inflamed areas because sLex present on the surface of white blood cells binds to
selectin molecules present on activated endothelium. This binding slows the flow
of leukocytes through the bloodstream, which is one of the first steps in the
movement of white blood cells from the blood into the tissue. The second step in
this process is VCAM mediated white blood cell attachment and migration which
helps to localize white blood cells in areas of injury or infection.

     The selectins may be involved in acute and chronic inflammatory diseases
such as reperfusion injury (tissue injury caused when blood flow is restored
following removal of an obstruction) and asthma, both primary areas of interest
for the Company. The Company estimates that there are approximately 685,000
patient cases of coronary reperfusion injury in the U.S. annually and that
between fourteen and fifteen million persons in the U.S. suffer from asthma. The
presence of VCAM at sites of endothelial injury leads to an accumulation at
these sites of Very Late Antigen-4 ("VLA-4")-containing white blood cells.
Diseases that are associated with chronic inflammation include asthma,
atherosclerosis or the accumulation of fatty deposits in the artery, psoriasis
and rheumatoid arthritis.

     Product Candidate - TBC1269. The Company has developed a computer model of
the selectin/sLex complex and used it to produce a novel class of synthetic
small molecule compounds that inhibit the selectin-mediated cellular adhesion
that occurs during inflammation. The lead compound in the series, TBC1269, has
shown efficacy both in cell-based and biochemical assays, and in animal models
of inflammation. TBC filed an IND with the FDA for TBC1269 in August 1997. A
Phase IIa clinical trial in allergic asthma was completed during 1998 in mild to
moderate asthmatics. The trial, which involved 21 patients with mild to moderate
asthma, demonstrated statistically significant improvement over placebo as
measured by reducing eosinophil recruitment. Eosinophils are white blood cells
that are involved in many inflammatory diseases, including asthma. Reductions in
lung eosinophils have been shown to improve the course of an asthmatic response.
The Company is currently developing inhaled and topical formulations of TBC1269
for clinical testing in asthma and psoriasis, respectively.

     Product Candidate - VCAM/VLA-4. TBC has also identified VCAM antagonists
for the intercellular adhesion observed in atherosclerosis. The Company's
initial lead compounds block the ability of white blood cells to interact
through VCAM and VLA-4. These lead compounds are being modified in an attempt to
improve efficacy. TBC has 





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<PAGE>   8

demonstrated efficacy in small molecule antagonists in an animal model of acute
inflammation, suggesting that VCAM/VLA-4 plays a role in this disease process.
These compounds are still in research.

     Other Indications. The Company believes these anti-inflammatory compounds
may have applicability in other indications. For example, a selectin antagonist
may be used to treat psoriasis, or a VCAM antagonist may be used to treat
asthma, rheumatoid arthritis and multiple sclerosis. The Company may consider
licensing certain indications to third parties, although no assurance can be
given that the Company will be successful in entering into any such license.

                     VASCULAR PROLIFERATION DISEASE PROGRAM

     Background. Smooth muscle cells in the blood vessel wall proliferate in
response to injury to the vessel. When the endothelial cell layer is damaged,
platelets attach to the vessel surface. Platelets and other cells begin to
release cellular growth factors, including the proteins FGF, platelet-derived
growth factor and thrombin. In response to these growth factors, specific genes
are activated in the smooth muscle cells. The products of these genes stimulate
the smooth muscle cells to move and divide. When the initial damage is slight,
the proliferation is limited to endothelial cell repair. If the damage is more
extensive, the smooth muscle cells continue to proliferate. Eventually, the
proliferation process thickens the vessel wall, reduces the interior size of the
blood vessel and produces a stenosis (a blood vessel with reduced lumen
diameter). This stenosis is comprised primarily of smooth muscle cells and
protein called fibroproliferative material. The process of producing this
fibroproliferative material is referred to as the fibroproliferative response.
Fibroproliferative stenosis differs from stenosis produced by atherosclerotic
plaque, which contains smooth muscle cells, fatty deposits and macrophages (a
type of white blood cell). As with atherosclerotic plaque stenosis, however,
blood flow is restricted, and the tissue served by the vessel is deprived of
oxygen. If the stenosis occurs in a coronary artery, the heart muscle is
deprived of oxygen, and a heart attack may result.

     Fibroproliferative material is generally produced in response to extensive
damage to the blood vessel wall as a result of a mechanical injury. Mechanical
injury sufficient to produce the fibroproliferative response often occurs during
procedures designed to repair blood vessels that are occluded by plaque or
thrombus material, such as mechanical reopening of arteries (angioplasty) and
coronary artery bypass graft surgery. Other surgical procedures, including vein
grafts and organ transplants, can also produce fibroproliferative stenosis. When
fibroproliferative stenosis occurs following the removal of the stenosis by
surgical or other means, it is referred to as restenosis. Irrespective of how
the injury is produced, the conditions which lead to the fibroproliferative
response are termed vascular proliferative diseases.

     Product Candidate - FGF Antagonist. The Company's research program for
vascular proliferative disease is focused on identifying the factors that
activate cells to proliferate and developing small molecule antagonists to these
factors. Using its knowledge of the signaling pathways through which these
factors stimulate cells to proliferate, the Company seeks to develop compounds
that disrupt the signaling process between cells and prevent unnecessary smooth
muscle cell proliferation.

     The Company has focused on FGF because of a growing body of evidence as to
its central role in blood vessel formation. The Company's research has shown
that some components of the signaling pathways used by FGF are important for
smooth muscle cell proliferation. TBC's current effort on FGF involves the
development of small molecules designed to prevent activation of latent FGF, and
to block FGF receptor targets. The Company estimates that approximately 685,000
annual patient cases exist in the U.S. which could utilize an FGF antagonist in
the treatment of coronary restenosis.

     Other Applications. The Company believes an FGF antagonist may have other
applications. For example, an FGF antagonist might be developed to treat
rheumatoid arthritis or cancer. The Company may consider licensing certain
indications to third parties, although no assurance can be given that the
Company will be successful in entering into any such license.




                                       7
<PAGE>   9
                              ANGIOGENESIS PROGRAM

     Background. Angiogenesis, the formation of new blood vessels from
pre-existing vessels, depends on a delicate balance of local physical and
chemical stimuli acting on the vascular endothelium. Angiogenesis is associated
with numerous physiological processes, including embryogenesis, wound healing,
organ regeneration, and the female reproductive cycle. However, angiogenesis
also plays a major role in the pathogenesis of tumor growth, rheumatoid
arthritis, atherosclerosis, various retinopathies, certain skin diseases and
gingivitis. One of the key factors required for angiogenesis is Vascular
Endothelial Growth Factor ("VEGF"). Increases in VEGF expression may be a common
mechanism underlying diverse, yet inter-related pathologies such as tumor
growth, retinal neovascularization (new blood vessel development in the back of
the eye) and rheumatoid arthritis where tissue hypoxia is a central component.
The VEGF protein is produced by smooth muscle cells and other tissues, including
tumor cells, and is essential for the formation of the new blood vessels.
Antagonists to VEGF may be useful for the prevention of the vascular
complications of diabetes and for limiting the growth of solid tumors and
rheumatoid arthritis.

     Product Candidate - VEGF Antagonist. The Company's research program is
directed towards the development of small molecule inhibitors of VEGF. VEGF is a
member of the heparin binding growth factor family, as is FGF. Using similar
technology to that used for the FGF antagonist program, the Company has
discovered small molecule inhibitors of VEGF action. The lead compound has been
shown to effectively prevent VEGF function in vitro. The compound also prevents
the vascular actions of VEGF in a rodent model of angiogenesis. TBC scientists
are currently attempting to further optimize this inhibitor series to identify a
clinical candidate. The Company estimates that approximately 1.1 million solid
organ cancer patient cases occur in the U.S. annually which could utilize a VEGF
antagonist in their treatment.

                                APOPTOSIS PROGRAM

     Background. Over the past few years it has become evident that cells have a
built-in mechanism for programmed death, termed apoptotic death, which is
important in the formation, organization and remodeling of tissues during
development. This mechanism contrasts with necrotic death which is often the
result of hypoxic injury to tissues. There appear to be certain conditions where
apoptosis is thought to contribute to the progression of a disease state. In
particular, much of the tissue damage which develops over time following an
ischemic stroke (resulting from a blood clot) or a heart attack is thought to be
the result of apoptotic death occurring in the tissue. Additionally, diseases
such as rheumatoid arthritis may have components of apoptosis. In this case, the
death of certain cells in a joint, in combination with over-proliferation of
other cells, contribute to the local irritation that is observed. Evidence
suggests this apoptotic process may be stimulated by inflammatory cells in the
tissue. Thus, inhibitors of apoptosis may be useful in treating a number of
disease conditions.

     Product Candidates - TNF(alpha) Antagonist, Caspase Inhibitors. The
Company's research in this area is focused on the identification of factors
which contribute to apoptotic death in the heart and brain following a heart
attack or stroke, which occur in 1.1 million and 600,000 patients, respectively,
in the U.S. annually. One of the factors which has been identified as being
important in these and other disease settings is Tumor Necrosis Factor a
("TNF(alpha)"). TBC scientists have identified small molecule antagonists of
this factor which block TNF(alpha)'s ability to bind to and kill cells in vitro.
These compounds are currently undergoing additional optimization prior to
selection of a clinical candidate. In addition to use in heart attack or stroke,
the Company estimates that approximately two million U.S. patient cases occur
annually which could utilize a TNF(alpha) antagonist in the treatment of
rheumatoid arthritis. Caspases are proteases which are responsible for mediating
the cell death signal in various cell types. TBC is currently attempting to
identify lead compounds to block caspase action.

     Other Indications. The Company believes a TNF(alpha) antagonist may have
other indications. For example, a TNF(alpha) antagonist might be developed to
treat inflammatory bowel disease. The Company may consider licensing certain
indications to third parties, although no assurance can be given that the
Company will be successful in entering into any such license.



                                       8
<PAGE>   10
                                OTHER INDICATIONS

     The Company believes that a number of the small molecule non-carbohydrate
therapeutics that are being developed in its programs may have applications for
other indications. For example, an FGF antagonist might be developed to treat
rheumatoid arthritis, a selectin antagonist to treat psoriasis, transplant
rejection and adult respiratory distress syndrome, and a VCAM antagonist to
treat asthma, rheumatoid arthritis and multiple sclerosis. The Company may
consider licensing certain indications to third parties, although no assurance
can be given that the Company will be successful in entering into any such
license.

        RESEARCH AND DEVELOPMENT COLLABORATIONS AND LICENSING AGREEMENTS

     The Company has established collaborations with a number of corporations,
research institutions and scientists to further its research and development
objectives. These collaborations are generally conducted pursuant to agreements
that (i) grant the Company a license to, or the option to license, or (ii) grant
other companies the right to develop and market certain technology, patent
rights or material that may be valuable to the Company and its collaborators.
The Company's major licensing and collaboration agreements are summarized below.

     Mitsubishi. TBC has entered into the Mitsubishi Agreement to license
Mitsubishi's rights and technology relating to NOVASTAN(R) and to license
Mitsubishi's own proprietary technology developed with respect to NOVASTAN(R).
Under the Mitsubishi Agreement, the Company has an exclusive license to use and
sell NOVASTAN(R) in the U.S. and Canada for all cardiovascular, renal,
neurological and immunological purposes other than use for the coating of
stents. The Company is required to pay Mitsubishi specified royalties on net
sales of NOVASTAN(R) by the Company and its sublicensees after its commercial
introduction in the U.S. and Canada. Either party may terminate the Mitsubishi
Agreement on 60 days notice if the other party defaults in its material
obligations under the agreement, declares bankruptcy or is insolvent, or if a
substantial portion of its property is subject to levy. Unless terminated sooner
pursuant to the above described termination provisions, the Mitsubishi Agreement
expires on the later of termination of patent rights in a particular country or
20 years after first commercial sale of products in a particular country. Under
the Mitsubishi Agreement, TBC has access to an improved formulation patent
granted in the U.S. in 1993 which expires in 2010 and a use patent in the U.S.
which expires in 2009. The Company has agreed to pay a consultant involved in
the negotiation of these agreements a royalty based on net sales of products.

     SmithKline. In connection with TBC's development and commercialization of
NOVASTAN(R), on August 5, 1997, TBC entered into a Product Development, License
and CoPromotion Agreement with SmithKline (the "SmithKline Agreement") whereby
SmithKline was granted an exclusive sublicense in the U.S. and Canada for the
indications of NOVASTAN(R) that TBC has licensed from Mitsubishi. SmithKline
paid $8.5 million in upfront license fees during August 1997, a $5 million
milestone payment in October 1997, and has agreed to pay up to $15.0 million in
additional milestone payments based on the clinical development and FDA approval
of NOVASTAN(R) for the HIT, HITTS and AMI indications. Future milestone payments
for the AMI indication are subject to SmithKline's agreement to market
NOVASTAN(R) for such indication. TBC was responsible for completing the ongoing
HIT/HITTS clinical trials, with SmithKline providing 60% of the funding for any
additional HIT/HITTS trials (except that SmithKline will pay 100% of the costs
of certain Phase IV trials, if such trials are needed). SmithKline will be
responsible for the marketing of NOVASTAN(R) in the licensed territory for those
indications which SmithKline agrees to develop, subject to TBC's rights to use
its own sales force to co-promote NOVASTAN(R) on a profit sharing basis
following the regulatory approval of NOVASTAN(R) for an additional major
indication beyond HIT.

     The parties have also formed a joint development committee to analyze the
development of additional NOVASTAN(R) indications (such as AMI and stroke)
covered by TBC's license from Mitsubishi to be funded 60% by SmithKline.
SmithKline has the exclusive right to commercialize all products arising out of
the collaboration, subject to the obligation to pay royalties on net sales to
TBC and to the rights of TBC to co-promote these products through its own sales
force in certain circumstances. TBC will retain the rights to any indications
which SmithKline determines it does not wish to pursue, subject to the
requirement that TBC may not grant marketing rights to any third parties and
must use its own sales force to commercialize any such indications. Any
indications which TBC 




                                       9
<PAGE>   11

and SmithKline elect not to develop will be returned to Mitsubishi, subject to
the rights of SmithKline and TBC to commercialize these indications at their
election, with SmithKline having the first opportunity to commercialize.
Mitsubishi may also request the joint development committee to develop new
indications inside or outside the licensed field of use, and if the joint
development committee determines that it does not want to proceed with any such
indication, all rights under the Mitsubishi Agreement regarding such indication
will revert to Mitsubishi subject to the right of SmithKline and TBC to
commercialize the indication, with SmithKline having the first opportunity to
commercialize. At this time, SmithKline has no plans to conduct development work
for the AMI and stroke indications. TBC is evaluating the feasibility of
development of NOVASTAN(R) for stroke and possibly AMI.

     The SmithKline Agreement generally terminates on a country by country basis
upon the earlier of the termination of TBC's rights under the Mitsubishi
Agreement, the expiration of applicable patent rights or, in the case of certain
royalty payments, the commencement of substantial third-party competition.
SmithKline also has the right to terminate the agreement on a country by country
basis by giving TBC at least three months written notice, based on a reasonable
determination by SmithKline, that the commercial profile of the product in
question would not justify continued development or marketing in that country.
In addition, either party may terminate the SmithKline Agreement on 60 days
notice if the other party defaults in its obligations under the agreement,
declares bankruptcy or is insolvent. The Company has agreed to pay an agent
involved in the negotiation of the SmithKline Agreement a fee based on a
percentage of all consideration received by TBC including royalties.

     At present, Mitsubishi is the only manufacturer of NOVASTAN(R), and has
entered into the Mitsubishi Supply Agreement with SmithKline to supply
NOVASTAN(R) in bulk in order to meet SmithKline's and TBC's needs under the
SmithKline Agreement. Should Mitsubishi fail during any consecutive nine-month
period to supply SmithKline at least 80% of its requirements, and such
requirements cannot be satisfied by existing inventories, the Mitsubishi Supply
Agreement provides for the nonexclusive transfer of the production technology to
SmithKline. If SmithKline cannot commence manufacturing of NOVASTAN(R) in a
timely manner or if alternate sources of supply are unavailable or uneconomic,
the Company's results of operations would be materially and adversely affected.

     In connection with the execution of the SmithKline Agreement, SmithKline
purchased 176,922 shares of TBC's Common Stock for $1.0 million and an
additional 400,000 shares of Common Stock for $2.0 million in connection with a
public offering which closed on October 1, 1997.

     Synthelabo. On October 11, 1994, the Company signed a collaborative
agreement with Synthelabo to develop and market compounds for vascular
proliferative disease derived from the Company's research programs. Upon
consummation of the transaction, Synthelabo purchased 1,428,571 shares of Common
Stock for a total of $5.0 million becoming the Company's largest shareholder at
that time and paid the Company a non-refundable licensing fee of $3.0 million.
During 1997, Synthelabo sold all of the Common Stock. In addition, Synthelabo
paid $3.0 million annually in research payments for two years and paid $750,000
for the third year. Synthelabo is not currently paying any research payment
pursuant to the agreement. Synthelabo will pay royalties to TBC based on the net
sales in those areas covered in the agreement. In exchange for the above
consideration, Synthelabo received an exclusive license to manufacture, use, and
sell any products generated from the research, in Europe, the Middle East,
Africa and the countries of the former Soviet Union.

     Synthelabo has the right to terminate the agreement any time on or after
October 15, 1997 for any reason and either party has the right to terminate the
contract for breach of any material obligation. If Synthelabo exercises this
termination right, the license granted to Synthelabo will terminate and TBC will
pay Synthelabo a royalty on net sales of any products sold in a certain
territory (Europe, Middle East, Africa and countries of the former Soviet Union)
for a period of time. In addition, Synthelabo may, at its option, require that
the technology be transferred to and the development program be conducted by a
joint venture owned by TBC and Synthelabo should TBC's "net worth", as defined
in the agreement, be less than $5.0 million as of the end of any calendar
quarter during the term of the agreement.

     In conjunction with the clinical development of NOVASTAN(R), the Company
and Synthelabo, the European licensee, have mutually agreed to exchange certain
clinical data from the clinical studies of NOVASTAN(R). In addition, the Company
agreed to provide certain data from its studies in exchange for up to $2.92
million as certain 




                                       10
<PAGE>   12

milestones are met of which approximately $2.88 million has been paid. See
"--Thrombosis Program--Product Candidate-- NOVASTAN(R)" for a discussion of the
clinical trial programs.

     LG Chemical. On October 10, 1996, the Company signed a strategic alliance
agreement with LG Chemical to develop and market compounds derived from the
Company's endothelin receptor and selectin antagonist programs for certain
disease indications. Upon consummation of the transaction, LG Chemical purchased
1,250,000 shares of Common Stock for a total of $5.0 million. LG Chemical has
committed to pay $10.7 million in research payments. Of this amount, $4.1
million has already been paid, and $1.0 million will be paid on each of June 30
and December 31 of 1999 and 2000, and $1.3 million will be paid on June 30 and
December 31, 2001. LG Chemical has the right to terminate these future research
payments if TBC fails to meet certain milestones, which milestones will be
established by the parties from time to time in accordance with the agreement.
LG Chemical will pay royalties to TBC, based on net sales, in those geographic
areas covered by the agreement, which include Korea, China, India and certain
other Asian countries, excluding Japan. The Company has agreed to pay its agents
in the contract negotiations a commission on all consideration received
including a royalty on net sales.

                                 TBC TECHNOLOGY

     TBC uses a wide variety of technologies to develop pharmaceutical
treatments for cardiovascular diseases. The Company applies its understanding of
vascular biology and advanced drug design techniques to discover novel
therapeutics and to test these therapeutics in-house using in vitro and in vivo
test systems. TBC has assembled a team of scientists with expertise in the
cultivation of human and animal endothelial and smooth muscle cells, signal
transduction in vascular cells, the role of growth factors in blood vessel
formation, the molecular biology of vascular cells, the development and
production of monoclonal antibodies to various targets, the interaction of white
blood cells and endothelial cells and the development of relevant animal models
of human disease. TBC believes that its scientists can study the behavior of
product candidates at all stages of development, from isolated biochemical
assays to whole cells, to intact animals and ultimately, to humans.

     To aid in the rapid discovery of novel drugs, TBC has developed an
integrated approach which may allow TBC to discover a broader class of drug
candidates more quickly and at a lower cost than is possible through other
current structure-based discovery methods. For example, TBC has developed a
number of proprietary, highly potent, orally active non-peptide ETA and ETB
receptor antagonists. These compounds have no chiral centers, are easily
scaleable, and may be synthesized in a small number of chemical steps. TBC has
also generated proprietary low molecular weight, small molecule inhibitors of
E-, P-, and L-selectin, potent peptide and small molecule VCAM/VLA-4 inhibitors,
FGF antagonists and vascular endothelial growth factor antagonists.

     TBC uses a number of proprietary and non proprietary components including,
Rational Drug Design, Random Library and Selected Library High Throughput
Screening and Virtual Libraries/Focused Compound Libraries to support its drug
development programs.

                              LICENSES AND PATENTS

     Because of the substantial length of time and expense associated with
developing new pharmaceutical products, the biotechnology industry places
considerable importance on obtaining patent and trade secret protection for new
technologies, products and processes. The Company's policy is to file patent
applications to protect technology, inventions and improvements that are
important to the development of its business. The Company has 14 pending U.S.
patent applications (2 of which have been allowed) and 15 issued U.S. patents
covering compounds including selectin inhibitors, endothelin antagonists and
VCAM/VLA-4 antagonists. In addition, the Company has exclusive licenses to three
patents covering rational drug design technology. The Company has also filed
patent applications in certain foreign jurisdictions covering projects that are
the subject of U.S. applications and intends to file additional patent
applications as its research projects develop. The Company licensed the U.S. and
Canadian rights to NOVASTAN(R) in 1993, which included access to an improved
formulation patent granted in 1993 which expires in 2010 and a use patent which
expires in 2009. If any of the NOVASTAN(R) patents remain outstanding at the
time NOVASTAN(R) receives FDA approval, the Company may apply, under the
Waxman/Hatch Act, for up to a five-year extension of one such patent. If all
such patents have expired at the time NOVASTAN(R) receives FDA approval, the
Waxman/Hatch Act will grant the Company NDA exclusivity for up to five years,
during which time 




                                       11
<PAGE>   13

the FDA may not accept or approve abbreviated applications for generic
variations of NOVASTAN(R). Although the Company believes that the expiration of
the NOVASTAN(R) patents will not have a material adverse effect on the
commercialization of NOVASTAN(R), there can be no assurance that the Company
will be able to take advantage of either the patent term extension or NDA
exclusivity provisions of the Waxman/Hatch Act. Moreover, even if the Company
receives either a patent term extension or NDA exclusivity, there can be no
assurance that generic pharmaceutical manufacturers will not ultimately enter
the market and compete with the Company.

     The patent positions of biopharmaceutical firms, including the Company, are
uncertain and involve complex legal and factual questions. Consequently, the
Company does not know whether any of its applications will result in the
issuance of patents or, if any patents are issued, whether they will provide
significant proprietary protection or will be circumvented or invalidated. Since
patent applications in the U.S. are maintained in secrecy until patents issue,
and since publication of discoveries in the scientific or patent literature
often lags behind actual discoveries, the Company cannot be certain that it was
the first creator of inventions covered by its pending patent applications or
that it was the first to file patent applications for such inventions. Moreover,
the Company may have to participate in interference proceedings declared by the
U.S. Patent and Trademark Office ("PTO") to determine priority of invention,
which could result in substantial cost to the Company, even if the eventual
outcome is favorable to the Company. TBC has one interference proceeding pending
which involves compounds not currently of commercial interest to TBC. There can
be no assurance that the Company's patents, if issued, would be held valid by a
court of competent jurisdiction. An adverse outcome could subject the Company to
significant liabilities to third parties, require disputed rights to be licensed
from third parties or require the Company to cease using such technology.

     The development of therapeutic products for cardiovascular applications is
intensely competitive. Many pharmaceutical companies, biotechnology companies,
universities and research institutions have filed patent applications or
received patents in this field. Some of these applications or patents may be
competitive with the Company's applications or conflict in certain respects with
claims made under the Company's applications. Such conflict could result in a
significant reduction of the coverage of the Company's patents, if issued. In
addition, if patents are issued to other companies that contain competitive or
conflicting claims and such claims are ultimately determined to be valid, no
assurance can be given that the Company would be able to obtain licenses to
these patents at a reasonable cost or develop or obtain alternative technology.

     The Company also relies upon trade secret protection for its confidential
and proprietary information. No assurance can be given that others will not
independently develop substantially equivalent proprietary information and
techniques or otherwise gain access to the Company's trade secrets or disclose
such technology, or that the Company can meaningfully protect its trade secrets.

     The Company requires its employees, consultants, members of its scientific
advisory board, outside scientific collaborators and sponsored researchers and
certain other advisors to enter into confidentiality agreements with the Company
that contain assignment of invention clauses. These agreements provide that all
confidential information developed or made known to the individual during the
course of the individual's relationship with the Company is to be kept
confidential and not disclosed to third parties except in specific
circumstances. In the case of employees, the agreements provide that all
inventions conceived by the employee are the exclusive property of the Company.
There can be no assurance, however, that these agreements will provide
meaningful protection or adequate remedies for the Company's trade secrets in
the event of unauthorized use or disclosure of such information.

                              GOVERNMENT REGULATION

     Regulation by governmental authorities in the U.S. and other countries will
be a significant factor in the production and marketing of any products which
may be developed by the Company. The nature and extent to which such regulation
may apply to the Company will vary depending on the nature of the specific
product. Virtually all of the Company's products will require regulatory
approval by governmental agencies prior to commercialization. In particular,
human therapeutic products are subject to rigorous preclinical and clinical
testing and other approval procedures by the FDA and similar health authorities
in foreign countries. Various federal statutes and regulations also govern or
influence the manufacturing, safety, labeling, storage, record keeping and




                                       12
<PAGE>   14

marketing of such products. The process of obtaining these approvals and the
subsequent compliance with appropriate federal and foreign statutes and
regulations requires the expenditure of substantial resources.

     The effect of government regulation may be to delay for a considerable
period of time or prevent the marketing of any product that the Company may
develop and/or to impose costly procedures on the Company's activities, the
result of which may be to furnish an advantage to the Company's competitors. Any
delay in obtaining or failure to obtain such approvals would adversely affect
the marketing of the Company's products and its ability to earn product revenue.

     In order to perform clinical tests and to produce and market products for
diagnostic or therapeutic use, a company must comply with mandatory procedures
and safety standards established by the FDA, the Health Protection Branch in
Canada, and comparable agencies in foreign countries. The FDA requires that
before beginning human clinical testing of a potential new drug, a company must
file an IND and receive its concurrence. This application is a summary of the
preclinical studies that were conducted to characterize the drug, including
toxicity and safety studies, as well as an in-depth discussion of the human
clinical studies which are being proposed.

     The pre-marketing program required for approval of a new drug typically
involves a time-consuming and costly three-phase process. In Phase I, trials are
conducted with a small number of patients to determine a drug's early safety
profile, the pattern of its distribution and metabolism. In Phase II, trials are
conducted with groups of patients afflicted with a target disease in order to
determine a drug's preliminary efficacy and optimal dosages and to expand
evidence of safety. In Phase III, large scale, multi-center comparative trials
are conducted with patients afflicted with a target disease in order to provide
enough data for statistical proof of efficacy and safety required by the FDA and
others. The FDA closely monitors the progress of each of the three phases of
clinical testing and may, in its discretion, reevaluate, alter, suspend or
terminate the testing based on the data that have been accumulated to that point
and its assessment of the risk/benefit ratio to the patient. Upon completion of
such clinical testing, a company typically submits a NDA to the FDA that
summarizes the results and observations of the drug during the clinical testing.
An NDA prefiling submission of the Chemistry, Manufacturing and Control section
may be made prior to the data and other sections of the NDA. Based on its review
of the NDA, the FDA will decide whether or not to approve the drug. This review
process can be quite lengthy, and approval for the production and marketing of a
new pharmaceutical product can require a number of years and substantial
funding. There can be no assurance that any approvals will be granted on a
timely basis, if at all.

     Once the sale of a product is approved for marketing, FDA regulations
govern the production process and marketing activities, and a post-marketing
testing and surveillance program may be required to continuously monitor a
product's usage and effects. Product approvals may be withdrawn if compliance
with regulatory standards is not maintained. Other countries in which any
products developed by the Company may be marketed impose a similar regulatory
process.

                                   COMPETITION

     General. The development and sale of new drugs for the treatment of
vascular diseases is highly competitive and the Company will face intense
competition from major pharmaceutical companies and biotechnology companies
worldwide. Competition may increase as a result of advances made in the
commercial applicability of technologies and greater availability of capital for
investment in these fields. Companies that complete clinical trials, obtain
required regulatory approvals and commence commercial sales of their products
before their competitors may achieve a significant competitive advantage. In
addition, significant research in biotechnology and vascular medicine may occur
in universities and other nonprofit research institutions. These entities have
become increasingly active in seeking patent protection and licensing revenues
for their research results. They also compete with the Company in recruiting
talented scientists.

     TBC has developed a competitive process for expediting rational drug
design. A number of other biopharmaceutical companies use rational drug design
as part of their effort to identify novel pharmaceutical agents. TBC believes
that its drug-design process could lead to more rapid lead drug candidate
identification.



                                       13
<PAGE>   15
     The Company believes that its ability to compete successfully will depend
on its capability to create and maintain scientifically-advanced technology,
develop proprietary products, attract and retain scientific personnel, obtain
patent or other protection for its products, obtain required regulatory
approvals and manufacture and successfully market products either alone or
through other parties. Many competitors have substantially greater financial,
marketing, and human resources than those of the Company. The Company expects to
encounter significant competition.

     NOVASTAN(R). Primary competitors for NOVASTAN(R) in the intravenous heparin
replacement market are initially expected to be bivalirudin, Revasc(R)
(desirudin) and Refludan(R) (lepirudin), manufactured by The Medicines Co.,
Rhone Poulenc Rorer ("RPR") and Hoechst Marion Roussel ("HMR"), respectively.
Bivalirudin and Revasc(R) have completed Phase III clinical trials. Refludan(R)
has received approval in Europe and the U.S for HIT.

     Biogen, the originator of bivalirudin, has completed a large Phase III
trial on bivalirudin which demonstrated improved safety versus heparin but only
equal efficacy. As a result of this study, Biogen halted development of
bivalirudin and outlicensed the compound earlier in 1997 to The Medicines Co.
The Company anticipates bivalirudin will have a relatively high cost of goods.
An improved manufacturing process for bivalirudin with a lower cost of goods has
been reported, and may become a competitive factor should the product be
approved for marketing. Bivalirudin has been submitted to the FDA for approval
for use in percutaneous transluminal coronary angioplasty ("PTCA") based on the
previous Phase III trial. On October 26, 1998, an FDA advisory committee
declined to recommend approval of bivalirudin for PTCA.

     A hirudin compound, Refludan(R) (lepirudin), from HMR has received approval
in Europe and the U.S. for HIT. On March 11, 1998, HMR received marketing
clearance for Refludan(R) in the U.S. Refludan(R) is also in development as an
adjunct to thrombolytic therapy in AMI. Another hirudin compound, Revasc(R),
from RPR has been studied in two large Phase III trials for AMI and unstable
angina. Both trials, TIMI-9 and GUSTO II, were halted in late 1994 due to
increased hemorrhagic stroke. Both trials resumed with reduced Revasc(R) dosing.
The bleeding complications with Revasc(R) may handicap the product in the
marketplace. As a result, development of Revasc(R) for acute coronary syndrome
has been halted. Revasc(R) has received marketing clearance in Europe for use in
deep venous thrombosis. A third hirudin compound, pegylated-hirudin from Knoll
AG ("Knoll") has begun Phase II development in acute coronary syndromes.

     If any of the first generation hirudin-like compounds obtain regulatory
approval in the U.S. or Canada prior to NOVASTAN(R), these drugs may gain a
competitive advantage. Other compounds which may be competitive with NOVASTAN(R)
include napsagatran from Hoffmann-La Roche, Inc. and inogatran and malagatran
from Astra Pharmaceuticals. These compounds are very similar to NOVASTAN(R) and
could have similar pharmacologic profiles. Napsagatran is in Phase II trials for
various indications including unstable angina. Inogatran has been tested in a
Phase II trial for unstable angina. Malagatran is in early clinical development.

     A defibrinogenating snake venom, viprinex from Knoll may be submitted for
approval to the FDA for acute ishemic stroke in the near future. The drug may
also be submitted to the FDA for HIT.

     Low Molecular Weight Heparins ("LMWH") are newer forms of heparin and are
used in prophylaxis for deep vein thrombosis following orthopedic surgery. Most
LMWH's also carry an immunological risk for precipitating HIT, and are
contraindicated as therapy in patients with HIT. A low molecular weight
heparinoid, Orgaran (danaparoid) from Organon, Inc. has been approved for deep
vein thrombosis. Organon, Inc. has conducted trials with this drug in HIT, and
an FDA filing for HIT may occur in the future.

     Endothelin Receptor Antagonist. TBC11251 is a small molecule ETA receptor
antagonist in Phase II clinical development. A number of other companies
including Abbott Laboratories ("Abbott"), Knoll, Bristol-Meyers Squibb and
Zeneca Pharmaceuticals have ETA receptor selective antagonist compounds in Phase
I/II clinical development. ETA receptor-selective compounds from Abbott and
Knoll are in early Phase II development in indications of interest to TBC. The
Company believes its compounds are competitive with those from the other
companies in terms of bioavailability, half-life and potency.



                                       14
<PAGE>   16
     Selectin Antagonist. TBC1269 is a small molecule selectin antagonist in
Phase II clinical development. Cytel Corporation has developed Cylexin(R), a
carbohydrate selectin antagonist in development for inflammatory disease
targets. This compound has recently completed Phase IIa trials for coronary
reperfusion injury. Although the results of these trials may negatively impact
one of the TBC potential indications (coronary reperfusion injury), the results
should have no impact on TBC1269's primary indication, asthma. Cytel is
currently studying Cylexin(R) in neonatal coronary reperfusion injury and the
compound is in Phase II/III development. The Company believes TBC1269 to have
advantages over Cylexin(R) in terms of potency and cost of manufacture.
Competitive drugs for acute asthma include intravenous steroids such as
Solu-Medrol(R). In spite of known side effects and delay in onset, intravenous
steroids are available generically and, as such, represent substantial price
competition. As for inhaled treatments for chronic asthma, inhaled steroids,
cromones (Tilade(R), Intal(R), etc.) and the leukotriene inhibitors including
Zyflow(R), Accolate(R) and Singulair(R) represent potential chronic
immunomodulator competition.

                           MANUFACTURING AND MARKETING

     TBC relies on its internal resources and third-party manufacturers to
produce compounds for preclinical development. Currently, the Company has no
manufacturing facilities for either the production of biochemicals or the
manufacture of final dosage forms. The Company believes small molecule drugs are
less expensive to manufacture than protein-based therapeutics, and that all of
its existing compounds can be produced using established manufacturing methods,
including traditional pharmaceutical synthesis.

     TBC has established supply arrangements with third-party manufacturers for
certain clinical trials and will establish supply arrangements ultimately for
commercial distribution, although there can be no assurance that such
arrangements will be established on reasonable terms. The Company's long-range
plan may involve establishing internal manufacturing of small molecule
therapeutics, including the ability to formulate, fill, label, package and
distribute its products. Under certain circumstances the Company plans to
outsource such manufacturing; however, the Company does not anticipate
developing an internal manufacturing capability for some time, nor is it able to
determine which of its potential products, if any, will be appropriate for
internal manufacturing. The primary factors the Company will consider in making
this determination are the availability and cost of third-party sources, the
expertise required to manufacture the product and the anticipated manufacturing
volume. Pursuant to the SmithKline Agreement, SmithKline has entered into the
Mitsubishi Supply Agreement regarding the manufacture and supply of NOVASTAN(R),
and the Company will not have any direct responsibility regarding the
manufacture and supply of NOVASTAN(R) as it relates to the SmithKline Agreement.
See "--Research and Development Collaborations and Licensing Agreements."

     TBC intends to market products for which it gains approval either directly
or through co-promotion or other licensing arrangements with large
pharmaceutical, biopharmaceutical or biotechnology companies. NOVASTAN(R) will
be initially commercialized by SmithKline through a collaboration. In the
future, the Company also plans to establish (i) a targeted, hospital-based sales
force to sell its compounds and (ii) strategic partner relationships for
non-strategic products and for customer groups outside TBC's targeted markets
or, in some cases, to co-promote in such markets with partners to optimize the
value of its products.

                  HAZARDOUS MATERIALS AND ENVIRONMENTAL MATTERS

     The Company's research and development activities involve the controlled
use of hazardous and radioactive materials. The Company is subject to federal,
state, and local laws and regulations governing the use, manufacture, storage,
handling and disposal of such materials and certain waste products. Management
believes that the Company is in compliance with such laws, regulations and
standards currently in effect and that the cost of compliance with such laws,
regulations, and standards will not have a material adverse effect on the
Company. The Company does not expect to incur any material capital expenditures
for environmental control in the foreseeable future.




                                       15
<PAGE>   17
                                 HUMAN RESOURCES

     As of December 31, 1998, TBC employed 84 individuals. TBC had 69 employees
engaged directly in research and development activities and 15 in general and
administrative positions. None of the Company's employees is represented by a
labor union. The Company has experienced no work stoppages and believes that its
relations with its employees are good.

     The Company's policy is to have each employee enter into a confidentiality
agreement which contains provisions prohibiting the disclosure of confidential
information to anyone outside the Company and requiring disclosure to the
Company of ideas, developments, discoveries or inventions conceived during
employment and assignment to the Company of proprietary rights to such matters
related to the business and technology of the Company.

     TBC's success is highly dependent on its ability to attract and retain
qualified scientific and management personnel. In order to commercialize its
products, the Company may need to substantially expand its personnel,
particularly in the areas of clinical trial management, manufacturing, sales and
marketing. The Company faces intense competition for such personnel from other
companies, academic institutions, government entities and other organizations.
There can be no assurance that the Company will be successful in hiring or
retaining qualified personnel.

                    SCIENTIFIC ADVISORY BOARD AND CONSULTANTS

     The Company has assembled a Scientific Advisory Board composed of
distinguished professors from some of the most prestigious medical schools. The
Scientific Advisory Board is assisting the Company in identifying research and
development opportunities, in reviewing with management the progress of the
Company's projects and in recruiting and evaluating scientific staff. Although
the Company expects to receive guidance from the members of its Scientific
Advisory Board, all of its members are employed on a full-time basis by others
and, accordingly, are able to devote only a small portion of their time to the
Company. Management expects to meet with its Scientific Advisory Board members
as a group at least once each year and individually from time to time on an
informal basis. Each of the members of the Scientific Advisory Board has entered
into a consulting agreement with the Company. The Scientific Advisory Board
includes James T. Willerson, M.D., as Chairman, and the following scientists.

     Morris J. Karnovsky, M.D. has served since 1972 as Shattuck Professor of
Pathological Anatomy at Harvard Medical School, where he was Chairman of the
Program in Cell and Developmental Biology from 1975 to 1989. Dr. Karnovsky
received the E.B. Wilson Award from the American Society for Cell Biology and
was inducted into the Institute of Medicine by the National Academy of Sciences
in 1991. In 1984, Dr. Karnovsky was elected to serve as President of the
American Society for Cell Biology. He is a member of numerous professional and
honorary societies, editorial boards and is the author or co-author of more than
275 scientific articles.

     Ferid Murad, M.D., Ph.D. is Professor and Chairman of the Department of
Integrative Biology and Pharmacology at the University of Texas-Houston Medical
School and the Director of the Institute of Molecular Medicine. Dr. Murad has
received many honors including the Nobel Prize in Medicine in 1998, Ciba Award
in 1988 and the Albert and Mary Lasker Award in Basic Medical Research in 1996.
He is also a member of many professional and honorary societies and is the
author or co-author of more than 300 scientific articles.

     Joseph F. Sambrook, Ph.D. is a Professor of Pathology at Melbourne
University, Australia and Director of Research at Peter MacCallum Cancer
Institute. He is a member of various honorary and professional societies,
editorial boards and is the author of more than 150 scientific articles.
Professor Sambrook previously worked for 20 years in the U.S. where he served on
many blue ribbon government and non-government committees.

     Ajit Varki, M.D. has been a Professor of Medicine since 1991 and is
currently serving in that position as well as leader of the glycobiology program
at the University of California, San Diego. Dr. Varki served as Instructor in
Medicine at Washington University School of Medicine from 1980 to 1982. He also
served as Assistant Professor of Medicine from 1982 to 1987 and as Associate
Professor of Medicine from 1987 to 1991 at the University of California, San
Diego. In 1975, Dr. Varki received an M.D. from Christian Medical College and
his Post-Doctorate 




                                       16
<PAGE>   18

in Biochemistry from Washington University from 1979 to 1982. He is a member of
various professional societies and has won numerous awards since 1969. He is
currently president of the American Society for Clinical Investigation. Dr.
Varki is the author or co-author of 160 scientific publications.

     Dr. Denton Cooley, Surgeon-in-Chief of the Texas Heart Institute, acts as
an advisory director to the Company.

     The Company also has agreements with various outside scientific consultants
who assist the Company in formulating its research and development strategy. All
of the Company's consultants and advisors are employed by employers other than
the Company and may have commitments to or consulting or advisory contracts with
other entities that may affect their ability to contribute to the Company.

ITEM 2.  PROPERTIES

         TBC leases 29,300 square feet of office and laboratory space in
Houston, Texas, including a 16,671 square foot laboratory facility and a 3,909
square foot animal facility. The remaining area is being used for clinical
development and administrative offices, storage space and additional offices for
scientists. The Company signed a letter of intent to lease approximately 8,591
square feet of additional space within its building to begin during 1999. The
Company's lease expires in December 2000 and includes a renewal option. The
Company may require additional space to accommodate future research and
laboratory needs as necessary to bring products into development and clinical
trials and has an option on additional space in its present facility. The
Company believes that these facilities are adequate for its present needs.

ITEM 3.  LEGAL PROCEEDINGS

     On November 21, 1994, a class action shareholders' suit was filed in the
United States District Court for the Southern District of Texas, Houston
Division seeking damages in the amount of $16 million. Plaintiffs are two
individuals who purchased shares of the Company on December 16, 1993 following
the Company's initial public offering ("IPO"). In their complaint, plaintiffs
have sued the Company, certain members of the board of directors and certain
officers alleging violations of Sections 11, 12 and 15 of the Securities Act of
1933, as amended (the "Act"). Plaintiffs have also named David Blech, D. Blech &
Co. and Isaac Blech as defendants. On January 23, 1995, the Company and the
members of the board of directors filed a motion to dismiss the plaintiffs'
complaint pursuant to Rule 9(b) and Rule 12b(6) of the Federal Rules of Civil
Procedure. In addition, defendant John Pietruski, Chairman of the Board of
Directors, filed a motion to dismiss the plaintiffs' complaint pursuant to Rule
12(b)(2) of the Federal Rules of Civil Procedure. The Court denied the motion by
the Company and by John Pietruski.

     On March 28, 1995, a second class action shareholders' suit was filed in
the United States District Court for the Southern District of New York seeking
unspecified damages. Plaintiffs are eight individuals who purchased shares in
various companies for which D. Blech & Co. acted as an underwriter (or
co-underwriter) or marketmaker. In their complaint, the plaintiffs have sued the
Company alleging violations of Section 10(b) of the Securities Exchange Act of
1934, as Amended (the "Exchange Act") and Rule 10b-5 promulgated thereunder by
the Securities and Exchange Commission (the "Commission"). Plaintiffs named a
number of defendants, including David Blech and D. Blech & Co., four
individuals, two brokerage firms, one investment management company and ten
other companies for which D. Blech & Co. acted as underwriter or marketmaker. On
June 6, 1996, the Court dismissed all of the Exchange Act and common law fraud
claims filed against the Company and its officers and directors, but afforded
those plaintiffs the right to attempt to preserve those claims by repleading
them. The Court ordered that those claims be repleaded no later than July 26,
1996. Plaintiffs did not replead those claims by the deadline, resulting in the
dismissal of all claims against the Company in this litigation.

     On August 14, 1995, the Judicial Panel on Multi-District Litigation ordered
that the action filed in the United States District Court for the Southern
District of Texas, Houston Division be transferred to the United States District
Court for the Southern District of New York for coordinated or consolidated
pretrial proceedings with the related actions pending there. In light of the
transfer and consolidation, the Company requested that the New York Court
reconsider the Texas Court's denial of its motion to dismiss as a part of the
Court's consideration of similar motions to dismiss filed by the other defendant
companies for which D. Blech & Co. acted as underwriter. All of these 




                                       17
<PAGE>   19

motions were presented to the Court on February 6, 1996. On June 6, 1996, the
New York Court granted the Company's and its officers' and directors' motion for
reconsideration, but together with all other similar pending motions, denied the
requested relief. Pursuant to the court's order, the Company therefore filed an
answer in the case. The Company also filed a Motion seeking leave of court to
prosecute an immediate appeal of the Court's denial of the Company's Motion to
Dismiss. The Court heard argument on that Motion on October 10, 1996. The motion
was denied on January 16, 1997. On February 3, 1999, the New York Court
certified the action as a class action. The Company is unable to evaluate its
potential outcome at this time. The Company disputes these claims and intends to
contest them vigorously. There can be no assurance, however that the final
disposition of this case will be favorable to the Company.

ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

       No matters were submitted to a vote of TBC's stockholders during the
fourth quarter of its fiscal year ended December 31, 1998.



                                       18
<PAGE>   20

                                     PART II

ITEM 5.  MARKET FOR THE REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER
               MATTERS

     The Common Stock and redeemable Common Stock purchase warrants trade
separately on the AMEX under the symbols TXB and TXB.WS, respectively.

<TABLE>
<CAPTION>
                                                  COMMON STOCK               PUBLIC WARRANTS
                                                 ---------------             ---------------
                                                 HIGH        LOW             HIGH        LOW
                                                 ----        ---             ----        ---
<S>                                              <C>         <C>             <C>        <C>  
     YEAR ENDED DECEMBER 31, 1997
       First Quarter                             7 1/4       3 7/8           2 3/8      11/16
       Second Quarter                            6 3/16      3 3/4           1 1/2       3/4
       Third Quarter                             6 1/2       4 9/16          1 9/16      7/8
       Fourth Quarter                            6 11/16     5               1 5/8       7/8

     YEAR ENDED DECEMBER 31, 1998
       First Quarter                             7 13/16     5 3/8           1 1/2       9/16
       Second Quarter                            9 1/2       3 3/4           2 3/4       1/8
       Third Quarter                             6           2 9/16            5/8       1/8
       Fourth Quarter                            5 1/4       2 7/16            3/4       1/16
</TABLE>

     As of March 19, 1999 there were approximately 557 holders of record of
Common Stock of the Company and approximately 11,000 beneficial holders. In
addition, there were approximately 18 holders of record of the Public Warrant
and approximately 1,700 beneficial holders. The Company has never paid dividends
and does not anticipate paying any cash dividends in the foreseeable future. The
Company intends to retain any future earnings and capital for use in its
business.

                     RECENT SALES OF UNREGISTERED SECURITIES

Previously reported in Form 10-Qs.





                                       19
<PAGE>   21

ITEM 6.  SELECTED FINANCIAL DATA

     The selected financial data presented below as of and for each of the
fiscal years in the five-year period ended December 31, 1998 and are derived
from the Company's audited financial statements. These selected financial data
should be read in conjunction with "Management's Discussion and Analysis of
Financial Condition and Results of Operations" and the financial statements and
notes thereto.

<TABLE>
<CAPTION>
                                                                             YEARS ENDED
                                                                             DECEMBER 31,
                                               -------------------------------------------------------------------------
                                                   1998           1997           1996           1995            1994
                                               ------------   ------------   ------------   ------------    ------------
<S>                                            <C>            <C>            <C>            <C>             <C>         
STATEMENT OF OPERATIONS DATA:
Revenues.....................................  $  2,251,681   $ 16,907,780   $  5,405,776   $  7,234,002    $  4,718,785
                                               ------------   ------------   ------------   ------------    ------------
Expenses:
   Research and development..................    14,122,671     16,833,135     22,251,895     14,949,822       8,936,004
   Charge for purchase of in-process
       research and development..............       133,875      1,075,191           --        2,061,383       6,404,227
   General and administrative................     4,597,014      5,759,792      4,067,505      4,693,019       3,992,183
   Restructuring and impairment of
       intangible assets.....................          --             --          421,165        643,750            --
                                               ------------   ------------   ------------   ------------    ------------
      Total expenses                             18,853,560     23,668,118     26,740,565     22,347,974      19,332,414
                                               ------------   ------------   ------------   ------------    ------------

Other income:
    Interest income.........................      2,087,707      1,122,900        898,039      1,200,921       1,011,251
    Interest expense........................           --             --             --           (1,068)         (1,315)
    Other...................................           --            2,253           --             --              --
                                               ------------   ------------   ------------   ------------    ------------
Total other income                                2,087,707      1,125,153        898,039      1,199,853       1,009,936
                                               ------------   ------------   ------------   ------------    ------------

Net loss...................................    $ 14,514,172   $  5,635,185   $ 20,436,750   $ 13,914,119    $ 13,603,693

Preferred dividend requirement.............           1,690      1,153,282           --             --              --
Net loss applicable to common shares.......      14,515,862      6,788,467     20,436,750     13,914,119      13,603,693
Net loss per common share (1)                  $       0.43   $       0.24   $       0.87   $       0.83    $       0.97
                                               ============   ============   ============   ============    ============
Weighted average common shares
   used to compute net loss per common share     33,930,276     27,745,700     23,616,033     16,748,995      14,018,269
                                               ============   ============   ============   ============    ============
</TABLE>

<TABLE>
<CAPTION>
                                                       DECEMBER 31,
                           -------------------------------------------------------------------
                              1998          1997          1996          1995          1994
                           -----------   -----------   -----------   -----------   -----------
<S>                        <C>           <C>           <C>           <C>           <C>        
BALANCE SHEET DATA:
Working capital            $29,907,191   $42,815,413   $10,109,803   $11,927,296   $22,930,263
Total assets                36,105,980    48,798,282    18,180,121    18,926,499    31,192,345
Stockholders' equity        33,236,220    46,167,066    13,627,406    15,710,125    27,557,596
</TABLE>


- ---------------------------

(1)      For information concerning calculation of net loss per share, see Note
         1(g) of Notes to Consolidated Financial Statements.



                                       20
<PAGE>   22

ITEM 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
         OF OPERATIONS

                                    OVERVIEW

     Since its inception in 1989, the Company has primarily devoted its
resources to fund drug discovery research and development. The Company has been
unprofitable to date and expects to incur substantial losses for the next
several years as the Company invests in product research and development,
preclinical and clinical testing and regulatory compliance. The Company has
sustained net losses of approximately $84.6 million from inception to December
31, 1998. The Company has primarily financed its operations to date through
certain private placements of Common Stock and shareholder loans, which have
raised an aggregate of $21.3 million in net proceeds, the IPO which raised an
aggregate of $24.2 million in net proceeds including the over-allotment sold in
January 1994, a private placement of Common Stock on February 13, 1996, which
raised $13.0 million in net proceeds, a private placement of 5% Preferred Stock
on March 14, 1997, which raised approximately $6.0 million in net proceeds, and
a secondary public offering which closed during October 1997 and raised
approximately $26.7 million in net proceeds.

     On July 25, 1994, the Company acquired all of the outstanding stock of IPI
in exchange for 1,599,958 shares of Common Stock, 999,956 shares of escrowed
Common Stock which were released upon satisfaction of certain research
milestones, and contingent stock issue rights to acquire 1,400,000 shares of
which 399,961 shares were issued upon satisfaction of certain research
milestones. IPI's financial results have been included in the Company's
financial statements beginning August 1, 1994. In March 1996, IPI's remaining
operations in California were consolidated with the Company's Houston
operations.

     The Company signed a collaborative agreement with Synthelabo on October 11,
1994. Upon consummation of the transaction, Synthelabo purchased 1,428,571
shares of Common Stock for a total of $5.0 million and paid a licensing fee of
$3.0 million. In addition, Synthelabo paid $3.0 million annually in research
payments for two years and paid $750,000 for the third year. During 1996, TBC
signed agreements with Synthelabo to provide copies of certain NOVASTAN(R)
clinical data. Over the life of the agreements TBC may receive as much as $2.92
million, of which $2.88 million has been received as of December 31, 1998.

     During October 1996, the Company executed a research and Common Stock
purchase agreement with LG Chemical. LG Chemical purchased 1,250,000 shares of
Common Stock for $5.0 million and committed to pay up to $10.7 million over a
five year period to develop two compounds in clinical development. Of this
amount, $4.1 million has been paid and $1.0 million will be paid on each of June
30 and December 31, of 1999 and 2000, and $1.3 million will be paid on June 30
and December 31, 2001.

     In August 1997, the Company entered into the SmithKline Agreement whereby
SmithKline was granted exclusive rights to work with TBC in the development and
commercialization of NOVASTAN(R) in the U.S. and Canada for specified
indications. Upon execution of the agreement, SmithKline paid an $8.5 million
license fee and during October 1997, paid a $5 million milestone payment to TBC
and has committed to pay up to a total of $15.0 million in additional milestone
payments based on the clinical development and FDA approval of NOVASTAN(R) for
the indications of HIT, HITTS and AMI. Future milestone payments for the AMI
indication are subject to SmithKline's agreement to market NOVASTAN(R) for such
indication. In connection with the SmithKline Agreement, SmithKline purchased
176,922 shares of Common Stock for $1.0 million and an additional 400,000 shares
of Common Stock for $2.0 million in conjunction with the Company's public
offering which closed during October, 1997. At this time, SmithKline has no
plans to conduct development work for the AMI and stroke indications. TBC is
evaluating the feasibility of development of NOVASTAN(R) for stroke and possibly
AMI.

     The Company's operating results have fluctuated significantly during each
quarter, and the Company anticipates that such fluctuations, largely
attributable to varying research and development commitments and expenditures,
will continue for the next several years.



                                       21
<PAGE>   23

                              RESULTS OF OPERATIONS


     Revenues were $2,251,681, $16,907,780 and $5,405,776 during 1998, 1997 and
1996, respectively. For the years 1997 and 1996, respectively, revenues included
$7,500 and $8,939 of product sales from the Company's subsidiary IPI. For the
years 1998, 1997 and 1996, revenues also included $2,251,681, $16,900,280 and
$5,395,110 from research agreements, commercialization agreements and
collaborations with various other companies. Revenues from research agreements
in 1998 includes research payments from LG Chemical, in 1997 includes research
payments from LG Chemical, a license fee of $8,500,000 and a milestone payment
of $5,000,000 and in 1996 includes $2.6 million in research payments from
Synthelabo and $2.3 million for data supplied to Synthelabo. Interest income was
$2,087,707, $1,122,900 and $898,039, for the years 1998, 1997 and 1996,
respectively. Interest income for the year 1998 was significantly higher over
1997 and 1996 due to investment of funds received in conjunction with the
SmithKline Agreement and a secondary public offering of common stock completed
in October 1997.
         Research and development expenses decreased 16% from $16,833,135 in
1997 to $14,122,671 in 1998 and decreased 24% from $22,251,895 in 1996 to
$16,833,135 in 1997. The decrease from 1997 to 1998 was due primarily to reduced
spending for clinical trials for NOVASTAN(R) that were completed in 1998 and
one-time charges during 1997 associated with the license of NOVASTAN(R). The
decrease from 1996 to 1997 was primarily due to the decrease in expenses related
to the clinical trials of NOVASTAN(R).

     Non cash charges for the purchase of in-process research and development
decreased from $1,075,191 in 1997 to $133,875 in 1998 because of Common Stock
issued pursuant to the NOVASTAN(R) license agreement and a research
collaboration agreement signed in 1998, respectively.

     In 1996 the Company charged $421,165 to expense for costs related to
restructuring IPI.

     General and administrative expenses decreased 20% from $5,759,792 in 1997
to $4,597,014 in 1998 and increased 42% from $4,067,505 in 1996 to $5,759,792 in
1997. The decrease in 1998 from 1997 and increase in 1997 over 1996 was
primarily because of a $952,919 noncash charge related to the 1997 extension of
the exercise period for certain stock options and an increase in 1997 legal fees
related to patent applications for TBC's compounds.

     Rent and related building services, which is a component of both research
and development and general and administrative expense, was approximately
$958,000 in 1998, $956,000 in 1997 and $1,025,000 in 1996. The decrease of
approximately $69,000 in 1997 from 1996 was primarily due to the consolidation
of IPI into TBC and the termination of the lease for the IPI facility.

     The Company incurred net losses applicable to common shares of $14,515,862,
$6,788,467 and $20,436,750 for the years ended December 31, 1998, 1997 and 1996,
respectively.

                         LIQUIDITY AND CAPITAL RESOURCES

     The Company has financed its research and development activities to date
principally through (i) public offerings and private placements of its equity
securities, (ii) issuances of Common Stock in conjunction with acquisitions and
research and collaboration agreements and exercises of stock options and
warrants, (iii) license fees and milestone and research payments received in
conjunction with research and collaborative agreements, and (iv) investment
income, net of interest expense. During 1998, the Company utilized net cash of
$13,951,755 in operating activities. The use of cash in operations was caused
primarily by the Company's net loss. Investing and financing activities
primarily reflect the utilization of $5,925,269 in net proceeds from the 1997
private placement of the preferred stock and $26,687,521 in net proceeds from
the secondary public offering of Common Stock, net of purchases and redemptions
of short term investments during 1998. In addition, $1,415,640 was provided by
exercise of warrants and stock options. At December 31, 1998, the Company had
cash, cash equivalents, short-term investments and long-term investments of
$30,376,002.



                                       22
<PAGE>   24

     The Company expects to incur substantial research and development
expenditures as it designs and develops small molecule drugs for vascular
diseases. The Company anticipates that operating expenses may increase during
1999 and subsequent years. The Company began to incur costs to develop
NOVASTAN(R) during the third quarter of 1993. These costs will continue during
1999 due to expenses associated with the amendment of the new drug application
with the FDA for NOVASTAN(R) and costs associated with additional clinical and
regulatory work being completed for NOVASTAN(R). The Company also began
incurring clinical trial costs in 1997 for the compounds TBC11251 and TBC1269
and is continuing its clinical trials for these compounds during 1999. In 1999,
the Company expects to begin to incur costs for clinical trials related to
additional compounds. These costs include, among other things, hiring personnel
to direct and carry out all operations related to the clinical trials, hospital
and procedural costs, services of a contract research organization and
purchasing and formulating large quantities of the compound to be used in such
trials. In addition, the Company anticipates that the administrative costs
associated with this effort will be significant. The amounts and timing of
expenditures will depend on the progress of the Company's ongoing research,
clinical development and commercialization efforts.

     The Company anticipates that its existing capital resources, research
payments from LG Chemical and its other revenue sources should be sufficient to
fund its cash requirements through the second quarter of the year 2000. This
date is contingent upon various factors, including the rates of patient
enrollment and spending associated with the development and commercialization of
NOVASTAN(R), the level of research, development and clinical trial expenditures
for TBC11251, TBC1269 and other compounds, results of clinical trials, the costs
and timing of regulatory approvals (including NOVASTAN(R)), the success of sales
and marketing efforts for NOVASTAN(R), if approved by the FDA, the exercise of
the Company's publicly traded warrants, if any, which expire on September 30,
1999 and are presently not "in the money", and the timing and terms of future
corporate collaborations, if any, entered into by the Company. If the Company
does not receive timely FDA approval for NOVASTAN(R), or such approval is
significantly delayed or if NOVASTAN(R) cannot be successfully marketed after
FDA approval, the Company will need to re-examine the use of its existing
capital resources. No assurances can be given that the Company will be able to
continue its research and development programs at currently anticipated levels.
Moreover, TBC's agreement with Synthelabo requires the Company to maintain a
"net worth", as defined in the agreement, of at least $5.0 million during the
term of the agreement. If the Company fails to maintain at least $5.0 million of
"net worth", Synthelabo may require that the technology, as defined in the
agreement, be transferred to, and the development program be conducted by, a
joint venture owned by TBC and Synthelabo. The outcome of certain lawsuits that
have been filed against the Company could also have an impact on liquidity. See
Part I, Item 3.
Legal Proceedings.

     The Company anticipates that it may need to raise substantial funds for
future operations through collaborative arrangements, public or private issuance
of debt and equity, or other arrangements. These financings could result in the
issuance of equity securities which dilute the existing holders of the Company's
Common Stock. The Company expects that as additional product candidates enter
clinical trials, the Company may incur increased expenditures for laboratory
space, scientific and administrative personnel, and services of contract
research organizations. There can be no assurance that the Company will be able
to obtain such additional financings or establish corporate collaborations on
acceptable terms or in time to fund its research and development programs. It is
likely that the Company's ability to raise additional funds will be adversely
affected by unfavorable results of its clinical trials and the failure to obtain
regulatory approvals for its product candidates, including NOVASTAN(R). In the
event such financing is not obtained, the Company's drug discovery or
development programs may be delayed, scaled back or eliminated. The Company may
also be required in this event to obtain funds through arrangements with
collaborative partners or others that may require the Company to relinquish
rights to certain of its technologies, product candidates or products that it
would not otherwise relinquish.

                     IMPACT OF INFLATION AND CHANGING PRICES

     The pharmaceutical research industry is labor intensive, and wages and
related expenses increase in inflationary periods. The lease of space and
related building services for the Houston facility contains a clause that
escalates rent and related services each year based on the increase in building
operating costs and the increase in the Houston Consumer Price Index,
respectively. To date, inflation has not had a significant impact on the
operations of the Company.




                                       23
<PAGE>   25
                                 YEAR 2000 ISSUE

     The Year 2000 ("Y2K") issue is the result of computer programs being
written using two digits rather than four to define the applicable year.
Computer equipment, software and other devices with imbedded technology that are
time-sensitive, such as computer systems, related software, research equipment,
alarm systems and telephone systems may recognize a date using "00" as the year
1900 rather than the year 2000. This could result in a system failure or
miscalculations causing disruptions of operations, including, among other
things, temporary inability to process data, and may materially impact the
Company's financial condition.

     The Company has undertaken various initiatives intended to ensure that it
is prepared for the Y2K issue. The Company is in the process of assessing its
state of readiness. Presently, the Company has reviewed its scientific
equipment, computer systems and related software to identify systems which may
exhibit Y2K issues. This review was performed by internal teams from various
disciplines within the Company. These teams evaluated the Company's equipment,
computer systems and software for Y2K issues and is currently performing testing
to insure proper operation after January 1, 2000. If necessary, specific
remediation plans will be developed for non-compliant items after testing is
completed. As a part of this review the Company will determine the known risks
related to the consequences of a failure to correct any Y2K deficiencies. The
Company has initiated formal communications with material third parties to
determine the extent to which the Company may be vulnerable to those third
parties' failure to remediate their Y2K problems. The Company and its licensee,
SmithKline Beecham plc are dependent upon Mitsubishi Chemical Corporation for
supply of bulk NOVASTAN(R) for clinical trial material and for its inventory
needs should the FDA approve the compound for marketing. The Company has
received communication from Mitsubishi Chemical Corporation which states that it
has undertaken to become Y2K compliant. Any Y2K issues which would result in
significant interruptions of delivery schedules could have a material effect on
the Company's operations. However, the Company is presently not aware of any Y2K
issues that have been encountered by any third party, which could materially
affect the Company's operations.

     The Company has developed a contingency plan to address potential Y2K
issues. This contingency plan addresses problems that the Company may encounter
after January 1, 2000 and will be updated to include issues identified during
the course of its remediation efforts and reasonably foreseeable problems that
may arise as a result of Y2K, including, but not limited to computer hardware
and software and research equipment. The contingency plan will be continually
refined as additional information becomes available. However, it is unlikely
that any contingency plan can fully address all events that may arise.

     The Company estimates that the costs associated with the Y2K issue will not
be material, and as such will not have a significant impact on the Company's
financial position or operating results. The Company's current estimate of Y2K
remediation costs is approximately $50,000 which may be revised should other
remediation costs be discovered in the review of Y2K issues. However, the
failure to discover or correct a material Y2K problem could result in an
interruption in the Company's normal business activities or operations. Such
failure could materially and adversely affect the Company's results of
operation, liquidity and financial condition.

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

     Not applicable.

ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

     The financial statements of the Company required to be included in this
Item 8 are set forth in Item 14 of this Report.

ITEM 9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
         FINANCIAL DISCLOSURE

     Not applicable.



                                       24
<PAGE>   26



                                    PART III

ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

     The directors and executive officers of the Company are as follows:

<TABLE>
<CAPTION>
                            NAME                    AGE                            POSITION
                            ----                    ---                            --------
<S>                                                 <C>   <C>                               
John M. Pietruski (1)(2).........................   66    Chairman of the Board of Directors
David B. McWilliams (1)..........................   55    President, Chief Executive Officer and Director
Richard A. F. Dixon, Ph.D. (1)...................   45    Vice President, Research and Director
John McMurdo, M.D................................   58    Vice President, Clinical Development and Regulatory Affairs 
Stephen L. Mueller...............................   51    Vice  President,  Finance  and  Administration,   
                                                          Secretary and Treasurer
Pamela M. Murphy.................................   48    Vice President, Corporate Communications
Joseph M. Welch..................................   58    Vice President, Business Development
James T. Willerson, M.D. (1)(3)..................   59    Chairman of the Scientific Advisory Board and Director
Ron J. Anderson, M.D. (3)........................   52    Director
Frank C. Carlucci (2)............................   68    Director
Robert J. Cruikshank (3).........................   68    Director
James A. Thomson, Ph.D. (2)......................   54    Director
</TABLE>

(1)      Member, Executive Committee of the Board of Directors

(2)      Member, Compensation and Personnel Committee of the Board of Directors

(3)      Member, Audit Committee of the Board of Directors

       The additional information requested by this item will be contained in
the Company's definitive Proxy Statement ("Proxy Statement") for its 1999 Annual
Meeting of Stockholders to be held on May 4, 1999 and is incorporated by
reference from the sections titled "Election of Directors" and "Other
Information - Executive Officers and - Section 16(a) Beneficial Ownership
Reporting Compliance". Such Proxy Statement will be filed with the Securities
and Exchange Commission not later than 120 days subsequent to December 31, 1998.

ITEM 11.  EXECUTIVE COMPENSATION

       The information requested by this item is incorporated by reference from
the section titled "Other Information Executive Compensation" in the Company's
definitive Proxy Statement for the Annual Meeting of Stockholders to be held on
May 4, 1999.

ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

       The information requested by this item is incorporated by reference from
the section titled "Other Information Principal Stockholders" in the Company's
definitive Proxy Statement for the Annual Meeting of Stockholders to be held on
May 4, 1999.

ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

       The information requested by this item is incorporated by reference from
the sections titled Other Information Compensation Committee Interlocks and
Insider Participation" in the Company's definitive Proxy Statement for the
Annual Meeting of Stockholders to be held on May 4, 1999.




                                       25
<PAGE>   27
                                     PART IV

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

     (a) 1.     INDEX TO 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 and Schedules.

<TABLE>
<CAPTION>
                                                                                                            PAGE
                                                                                                            ----
<S>                                                                                                         <C>
              Independent Auditors' Report                                                                   F-1

              Consolidated Balance Sheets as of December 31, 1998 and 1997                                   F-2

              Consolidated Statements of Operations for the years ended December 31, 1998, 1997
              and 1996                                                                                       F-3

              Consolidated Statements of Stockholders' Equity for the years ended
              December 31, 1998, 1997 and 1996                                                               F-4

              Consolidated Statements of Cash Flows for the years ended December 31, 1998, 1997
              and 1996                                                                                       F-6

              Notes to Consolidated Financial Statements                                                     F-7
</TABLE>

         2.     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 cost of
         duplication and mailing the requested items.

     (b)   REPORTS ON FORM 8-K:

     No reports on Form 8-K were filed during the quarter ended December 31,
     1998.

     All 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 notes thereto.



                                       26
<PAGE>   28

                                   SIGNATURES

       PURSUANT TO THE REQUIREMENTS OF SECTION 13 OR 15(D) OF THE SECURITIES
EXCHANGE ACT OF 1934, THE REGISTRANT HAS DULY CAUSED THIS REPORT TO BE SIGNED ON
ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY AUTHORIZED, IN THE CITY OF HOUSTON
AND STATE OF TEXAS ON THE 25TH DAY OF MARCH, 1999.

                                     TEXAS BIOTECHNOLOGY CORPORATION

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

       PURSUANT TO THE REQUIREMENTS OF THE SECURITIES EXCHANGE ACT OF 1934, THIS
REPORT HAS BEEN SIGNED BELOW BY THE FOLLOWING PERSONS AND IN THE CAPACITIES
INDICATED ON THE 25TH DAY OF MARCH, 1999.

<TABLE>
<CAPTION>
                      SIGNATURE                                               TITLE
                      ---------                                               -----
<S>                                                           <C>
                /s/ JOHN M. PIETRUSKI                          Chairman of the Board of Directors
- -------------------------------------------------------
                  John M. Pietruski


               /s/ DAVID B. MCWILLIAMS                         Director, President and Chief Executive Officer
- -------------------------------------------------------
                 David B. McWilliams                           (Principal Executive Officer)


                /s/ RICHARD A.F. DIXON                         Director and Vice President, Research
- -------------------------------------------------------
              Richard A.F. Dixon, Ph.D.


                /s/ STEPHEN L. MUELLER                         Vice President, Finance and Administration,
- -------------------------------------------------------
                  Stephen L. Mueller                           Secretary and Treasurer
                                                               (Principal Financial and Accounting Officer)

                 /s/ RON J. ANDERSON                           Director
- -------------------------------------------------------
                Ron J. Anderson, M.D.


                /s/ FRANK C. CARLUCCI                          Director
- -------------------------------------------------------
                  Frank C. Carlucci


               /s/ ROBERT J. CRUIKSHANK                        Director
- -------------------------------------------------------
                 Robert J. Cruikshank


                 /s/ JAMES A. THOMSON                          Director
- -------------------------------------------------------
               James A. Thomson, Ph.D.


                /s/ JAMES T. WILLERSON                         Director
- -------------------------------------------------------
               James T. Willerson, M.D.
</TABLE>




                                       27
<PAGE>   29

                          INDEPENDENT AUDITORS' REPORT

The Board of Directors
Texas Biotechnology Corporation:


We have audited the accompanying consolidated balance sheets of Texas
Biotechnology Corporation and subsidiary as of December 31, 1998 and 1997, and
the related consolidated statements of operations, stockholders' equity, and
cash flows for each of the years in the three-year period ended December 31,
1998. These consolidated financial statements are the responsibility of the
Company's management. Our responsibility is to express an opinion on these
consolidated financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. 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 consolidated financial statements referred to above present
fairly, in all material respects, the financial position of Texas Biotechnology
Corporation and subsidiary as of December 31, 1998 and 1997, and the results of
their operations and their cash flows for each of the years in the three-year
period ended December 31, 1997 in conformity with generally accepted accounting
principles.




                                     KPMG LLP


Houston, Texas
February 12, 1999


                                      F-1
<PAGE>   30
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                          CONSOLIDATED BALANCE SHEETS

                                     ASSETS

<TABLE>
<CAPTION>
                                                                             DECEMBER 31,    DECEMBER 31, 
                                                                                 1998             1997
                                                                             ------------    ------------
<S>                                                                          <C>             <C>
Current assets:
     Cash and cash equivalents                                               $  4,176,911    $ 14,323,573
     Short-term investments                                                    20,407,146      29,383,791
     Long-term investments                                                      5,791,945              --
     Other current receivables                                                  1,426,959       1,175,280
     Prepaid expenses                                                             963,590         553,585
     Other current assets                                                          10,400          10,400
                                                                             ------------    ------------
          Total current assets                                                 32,776,951      45,446,629

Equipment and leasehold improvements, at cost less
     accumulated depreciation and amortization (note 5)                         3,269,438       3,292,062

Other assets                                                                       59,591          59,591
                                                                             ------------    ------------
          Total assets                                                       $ 36,105,980    $ 48,798,282
                                                                             ============    ============
   
                                 LIABILITIES AND STOCKHOLDERS' EQUITY


Current liabilities:
     Accounts payable                                                        $  1,209,853    $  1,006,145
     Accrued expenses                                                           1,659,907       1,625,071
                                                                             ------------    ------------
          Total current liabilities                                             2,869,760       2,631,216

Commitments and contingencies (notes 6, 7, 8, 9, 10 and 13)                            --              --

Stockholders' equity (notes 2, 3 and 6):
     Preferred stock, par value $.005 per share. At December 31, 1998,
          5,000,000 shares authorized; none outstanding. At December 31,     
          1997, 5,000,000 shares authorized, 300 shares issued and
          outstanding.                                                                 --               2
     Common stock, par value $.005 per share. At December 31, 1998,
          75,000,000 shares authorized; 34,128,017 shares issued and 
          outstanding. At December 31, 1997, 75,000,000 shares
          authorized; 33,585,919 shares issued and outstanding.                   170,640         167,929
     Additional paid-in capital                                               117,667,479     116,085,172
     Accumulated deficit                                                      (84,601,899)    (70,086,037)
                                                                             ------------    ------------
          Total stockholders' equity                                           33,236,220      46,167,066
                                                                             ------------    ------------

          Total liabilities and stockholders' equity                         $ 36,105,980    $ 48,798,282
                                                                             ============    ============
</TABLE>

          See accompanying notes to consolidated financial statements.


                                      F-2
<PAGE>   31
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                     CONSOLIDATED STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                                                                  YEAR ENDED DECEMBER 31,
                                                        ------------------------------------------
                                                            1998           1997           1996
                                                        ------------   ------------   ------------
<S>                                                     <C>            <C>            <C>
Revenues:
     Research agreements (note 8)                       $  2,251,681   $  8,400,280   $  5,395,110
     License fee income                                           --      8,500,000             --
     Products and services                                        --          7,500          8,939
     Grant revenue                                                --             --          1,727
                                                        ------------   ------------   ------------
          Total revenues                                   2,251,681     16,907,780      5,405,776
                                                        ------------   ------------   ------------

Expenses:
     Research and development                             14,122,671     16,833,135     22,251,895
     Charge for purchase of in-process research
          and development (notes 8, 9)                       133,875      1,075,191             --
     General and administrative                            4,597,014      5,759,792      4,067,505
     Restructuring and impairment charges (note 15)               --             --        421,165
                                                        ------------   ------------   ------------
          Total expenses                                  18,853,560     23,668,118     26,740,565
                                                        ------------   ------------   ------------

          Operating loss                                  16,601,879      6,760,338     21,334,789
                                                        ------------   ------------   ------------
Other income:
     Interest income                                       2,087,707      1,122,900        898,039
     Other                                                        --          2,253             --
                                                        ------------   ------------   ------------
          Total other income                               2,087,707      1,125,153        898,039
                                                        ------------   ------------   ------------

          Net loss                                        14,514,172      5,635,185     20,436,750
          Preferred dividend requirement                       1,690      1,153,282             --
                                                        ------------   ------------   ------------

          Net loss applicable to common shares          $ 14,515,862   $  6,788,467   $ 20,436,750
                                                        ============   ============   ============

Net loss per share basic and diluted                    $       0.43   $       0.24   $       0.87
                                                        ============   ============   ============

Weighted average common shares used to compute
     basic and diluted net loss per share                 33,930,276     27,745,700     23,616,033
                                                        ============   ============   ============
</TABLE>


          See accompanying notes to consolidated financial statements.


                                      F-3
<PAGE>   32
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY

              For the years ended December 31, 1998, 1997 and 1996

<TABLE>
<CAPTION>
                                                                                      
                                 PREFERRED STOCK       COMMON STOCK
                                 ----------------   --------------------     ADDITIONAL    DEFERRED                       TOTAL
                                 SHARES               SHARES                  PAID-IN   COMPENSATION    ACCUMULATED   STOCKHOLDERS'
                                 ISSUED    AMOUNT     ISSUED      AMOUNT      CAPITAL      EXPENSE        DEFICIT         EQUITY
                                 ------    ------   ----------    -------    -----------  -----------   -----------    ------------
<S>                              <C>       <C>      <C>           <C>        <C>          <C>           <C>            <C>
  Balance at January 1, 1996         --    $   --   17,439,365    $ 87,198  $ 59,540,730   $46,177     $(43,871,626)   $ 15,710,125
                                 ------    ------   ----------    --------  ------------   -------     ------------    -----------

Issuance of common stock and
  warrants through private
  placement, net of expenses         --        --    6,550,990     32,754     12,958,327         --              --      12,991,081
Issuance of common stock for
  stock option exercises             --        --      192,640        963        590,092         --              --         591,055
Issuance of common stock for
  warrant exercises                  --        --       57,274        286        200,173         --              --         200,459
Issuance of common stock to
  LG Chem for cash, net of
  expenses                           --        --    1,250,000      6,250      4,519,009         --              --       4,525,259
Compensation expense related
  to stock options                   --        --           --         --             --     46,177              --          46,177
Net loss                             --        --           --         --             --         --     (20,436,750)    (20,436,750)
                                 ------    ------   ----------   --------   ------------   --------    ------------    ------------
  Balance at December 31, 1996       --    $   --   25,490,269   $127,451   $ 77,808,331   $     --    $(64,308,376)   $ 13,627,406
                                 ------    ------   ----------   --------   ------------   --------    ------------    ------------

Issuance of common stock for
  stock option exercises             --        --       58,841        294        183,925         --              --         184,219
Issuance of common stock for
  warrant exercises                  --        --      548,438      2,742      2,028,206         --              --       2,030,940
Issuance of convertible
  preferred stock through
  private placement,                                                  
  net of expenses                 6,000        30           --         --      5,925,239          --             --       5,925,269
Issuance of common stock in
  line of board fees                 --        --        2,944         15         14,900         --              --          14,915
Compensation expense related
  to stock option extensions         --        --           --         --      1,303,094         --              --       1,303,094
Conversion of preferred stock
  into common shares             (5,700)      (28)   1,344,149      6,721        123,872         --              --         130,565
Issuance of common stock to
  SmithKline Beecham plc for
  cash, net of expenses              --        --      176,992        885        964,714         --              --         965,599
Issuance of common stock                                                                                    
  through public offering,
  net of expenses                    --        --    5,750,000     28,750     26,658,771         --              --      26,687,521
Issuance of common stock to
  Genentech pursuant to contra       --        --      214,286      1,071      1,074,120         --              --       1,075,191
Net loss                             --        --           --         --             --         --      (5,635,185)     (5,635,185)
Preferred dividends                  --        --           --         --             --         --        (142,476)       (142,476)
                                 ------    ------   ----------   --------   ------------   --------    ------------    ------------
  Balance at December 31, 1997      300    $    2   33,585,919   $ 167,929  $116,085,172   $     --    $(70,086,037)   $ 46,167,066
                                 ------    ------   ----------   --------   ------------   --------    ------------    ------------
                                                                                          
                                                                                         
</TABLE>
          See accompanying notes to consolidated financial statements.

                                      F-4
<PAGE>   33
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

           CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY, CONTINUED

<TABLE>
<CAPTION>
                                 PREFERRED STOCK      COMMON STOCK
                                 ---------------   -------------------    ADDITIONAL      DEFERRED                      TOTAL
                                 SHARES              SHARES                PAID-IN     COMPENSATION   ACCUMULATED   STOCKHOLDERS'
                                 ISSUED   AMOUNT     ISSUED     AMOUNT     CAPITAL        EXPENSE       DEFICIT         EQUITY
                                 ------   ------   ----------   ------   -----------   ------------   -----------   -------------
<S>                              <C>      <C>      <C>         <C>       <C>           <C>             <C>             <C>  
  Balance at December 31, 1997      300   $    2   33,585,919  $167,929  $116,085,172  $          --  $ (70,086,037) $  46,167,066
                                 ------   ------   ----------  --------  ------------  -------------  -------------  -------------
Issuance of common stock for
  stock option exercises             --       --      127,947       640       322,141             --            --         322,781
Issuance of common stock for
  warrant exercises                  --       --      304,850     1,524     1,091,335             --            --       1,092,859
Issuance of common stock in
  lieu of board fees                 --       --        4,506        23        21,876             --            --          21,899
Conversion of preferred stock
  into common shares               (300)      (2)      64,795       324        13,280             --            --          13,602
Issuance of common stock to
  Hedral Therapeutics, Inc.
  pursuant to contract               --       --       40,000       200       133,675             --            --         133,875
Net loss                             --       --           --        --            --             --   (14,514,172)    (14,514,172)
Preferred dividends                  --       --           --        --            --             --        (1,690)         (1,690)
                                 ------   ------   ----------  --------  ------------  -------------  ------------   -------------
  Balance at December 31, 1998       --   $   --   34,128,017  $170,640  $117,667,479  $          --  $(84,601,899)  $  33,236,220
                                 ======   ======   ==========  ========  ============  =============  ============   =============
</TABLE>

          See accompanying notes to consolidated financial statements.
    

                                      F-5
<PAGE>   34
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                     CONSOLIDATED STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                                                                YEAR ENDED DECEMBER 31,
                                                                       ------------------------------------------
                                                                           1998            1997           1996
                                                                       ------------    -----------    -----------
<S>                                                                    <C>             <C>            <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
   Net loss                                                            $(14,514,172)    (5,635,185)   (20,436,750)
   Adjustments to reconcile net loss to net cash
      used in operating activities:
         Write-off of deferred offering costs related
           to delayed offering                                                  ---            ---         24,140
         Depreciation and amortization                                      806,251        751,397        759,328
         Charge for purchase of in-process research and development         133,875      1,075,191            ---
         Expenses paid with stock                                            21,899         14,914            ---
         Compensation expense related to stock options                          ---      1,303,094         46,177
         Preferred dividends payable not included in net loss                11,912        (11,912)           ---
         Loss on disposition of fixed assets                                 11,620            ---          7,056
   Change in operating assets and liabilities, net of
      effect of acquisition:
      (Increase) decrease in prepaid expenses                              (410,005)        (6,833)         7,456
      Increase in other current receivables                                (251,679)      (462,205)           ---
      Decrease (increase) in other current assets                               ---          2,000        (55,584)
      Increase in other assets                                                  ---            ---        (33,594)
      Increase (decrease) in current liabilities                            238,544     (1,296,499)     1,361,451
      Decrease in deferred revenue                                              ---       (625,000)       (25,110)
                                                                       ------------    -----------    -----------
         Net cash used in operating activities                          (13,951,755)    (4,891,038)   (18,345,430)
                                                                       ------------    -----------    -----------
CASH FLOWS FROM INVESTING ACTIVITIES:
   Purchases of equipment and leasehold improvements                       (798,247)      (585,446)      (494,965)
   Proceeds from disposition of equipment and leasehold improvements          3,000            ---         27,400
   Purchase of long-term investments                                     (5,791,945)           ---            ---
   Purchase of short-term investments                                   (48,600,008)   (39,163,424)   (31,176,391)
   Maturity of short-term investments                                    57,455,360     21,537,653     28,109,406
   Decrease (increase) in interest receivable included in short-term
      and long-term investments                                             121,293       (495,727)           ---
                                                                       ------------    -----------    -----------
         Net cash provided by (used in) investing activities              2,389,453    (18,706,944)    (3,534,550)
                                                                       ------------    -----------    -----------
CASH FLOWS FROM FINANCING ACTIVITIES:
   Proceeds from issuance of common stock, net                                  ---     26,687,521     18,307,855
   Proceeds from sale of preferred stock, net                                   ---      5,925,269            ---
   Proceeds from sale of common stock option and
      warrant exercises, net                                              1,415,640      3,180,766            ---
   Cost of delayed offering                                                     ---            ---        (24,140)
                                                                       ------------    -----------    -----------
         Net cash provided by financing activities                        1,415,640     35,793,556     18,283,715
                                                                       ------------    -----------    -----------
      Net (decrease) increase in cash and cash equivalents              (10,146,662)    12,195,574     (3,596,265)
Cash and cash equivalents at beginning of year                           14,323,573      2,127,999      5,724,264
                                                                       ------------    -----------    -----------
Cash and cash equivalents at end of year                               $  4,176,911     14,323,573      2,127,999
                                                                       ============    ===========    ===========
Supplemental schedule of noncash financing activities:
   issuance of Common Stock for research and development and
   services (see notes 3, 8 and 9)                                     $    155,774      1,090,105            ---
                                                                       ============    ===========    ===========
</TABLE>

          See accompanying notes to consolidated financial statements.


                                      F-6
<PAGE>   35

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(1)    ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES

       (a)    Organization

              Texas Biotechnology Corporation (the "Company" or "TBC"), a
              biopharmaceutical company, applies innovative drug discovery
              techniques and its specialized knowledge of the role of vascular
              cell biology in vascular diseases to the design and development of
              novel pharmaceutical compounds. Since its formation in 1989, the
              Company has been engaged principally in research and drug
              discovery programs and clinical development of certain drug
              compounds. On July 25, 1994, the Company acquired all of the
              outstanding Common Stock of ImmunoPharmaceutics, Inc. ("IPI") (now
              discontinued), a San Diego, California based company, in exchange
              for Common Stock of the Company. TBC consolidated the IPI
              operation into TBC in the first half of 1996.

              The Company is presently working on a number of long-term
              development projects which involve experimental and unproven
              technology, which may require many years and substantial
              expenditures to complete, and which may be unsuccessful. To date,
              other than small amounts of monoclonal antibody compounds and
              services produced and sold by IPI, the Company has not developed
              or sold any products, and no assurance can be given that the
              Company will be able to develop, manufacture or market any
              products in the future. In addition, no assurance exists that
              future revenues will be significant, that any sales will be
              profitable, or that the Company will have sufficient funds
              available to complete its research and development programs or
              market any products which it may develop.

       (b)    Basis of Consolidation

              The Company's consolidated financial statements include the
              accounts of the Company and its wholly owned subsidiary, IPI. All
              material intercompany transactions have been eliminated. The
              Company's consolidated financial statements include the activity
              related to IPI since August 1, 1994.

       (c)    Cash, Cash Equivalents, Short-Term Investments and Long-Term
              Investments

              Cash equivalents are considered to be those securities or
              instruments with original maturities, when purchased, of three
              months or less. At December 31, 1998, approximately $89,000 was
              invested in demand and money market accounts. Short-term
              investments are those investments which have an original maturity
              of less than one year and greater than three months. At December
              31, 1998, the Company's short-term investments consisted of
              approximately $4,483,000 in Government Agency Discount Notes and
              Bonds and $15,924,000 in Corporate Commercial Paper. Long-term
              investments consist of approximately $5,792,000 in Government
              Agency bonds with an original maturity of one year or more. Cash
              equivalents, short-term and long-term investments are stated at
              cost plus accrued interest, which approximates market value.
              Interest income is accrued as earned. In connection with the
              adoption of Financial Accounting Standards Statement 115, the
              Company classified all short-term investments and long-term
              investments as held to maturity.

       (d)    Equipment and Leasehold Improvements

              Equipment and leasehold improvements are stated at cost less
              accumulated depreciation and amortization. Depreciation of
              furniture and equipment is provided on the straight-line method
              over the estimated useful 





                                      F-7
<PAGE>   36

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


              lives of the respective assets (3 to 10 years). Amortization of
              leasehold improvements is provided on the straight-line method
              over the remaining minimum lease term.

       (e)    Intangible Assets

              Intangible assets are amortized on a straight line basis over ten
              years.

       (f)    Research and Development Costs

              All research and development costs are expensed as incurred and
              include salaries of research and development employees, certain
              rent and related building services, research supplies and
              services, clinical trial expenses and other associated costs. With
              respect to research and development, salaries and benefits for the
              year ended December 31, 1998, 1997 and 1996, totaled approximately
              $6,286,000, $5,645,000 and $6,233,000, respectively, of which
              approximately $4,725,000, $4,262,000 and $4,893,000, respectively,
              was charged to research and development. Payments related to the
              acquisition of in-process research and development are expensed as
              incurred.

       (g)    Net Loss Per Common Share

              Basic net loss per common share is calculated by dividing the net
              loss applicable to common shares after preferred dividend
              requirements by the weighted average number of common and common
              equivalent shares outstanding during the period. For the years
              1998, 1997 and 1996, there were no common equivalent shares used
              in the calculation of weighted average common shares outstanding.
              Preferred dividend requirements for the period ended December 31,
              1997 included $142,476 of accrued dividends and, pursuant to a
              Securities and Exchange Commission Staff Position, deemed
              dividends attributable to the conversion discount factor at
              issuance of the Preferred Stock of $1,010,806. For the years ended
              December 31, 1998, 1997 and 1996, the weighted average common
              shares used to compute basic net loss per common share totaled
              33,930,276, 27,745,700 and 23,616,033, respectively. The
              conversion of securities convertible into Common Stock and the
              exercise of stock options and warrants were not assumed in the
              calculation of diluted net loss per common share because the
              effect would have been antidilutive.

       (h)    Reclassifications

              Certain reclassifications have been made to prior period financial
              statements to conform with the December 31, 1998 presentation with
              no effect on net loss previously reported.

       (i)    Revenue Recognition

              Revenue from service contracts is recognized as the services are
              performed and/or as milestones are achieved. Milestone payments
              related to contractual agreements are recognized as the milestones
              are achieved. Revenue from products and services is recognized
              when the products are shipped or the services are performed.
              Revenue from licensing fees is recorded when the license is
              granted. Revenue from grants is recognized as earned under the
              terms of the related grant agreements. Amounts received in advance
              of services to be performed under contracts are recorded as
              deferred revenue.




                                      F-8
<PAGE>   37

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


       (j)    Patent Application Costs

              Costs incurred in filing for patents are expensed as incurred.

       (k)    Use of Estimates

              Management of the Company has made a number of estimates and
              assumptions relating to the reporting of assets and liabilities
              and the disclosure of contingent assets and liabilities to prepare
              these consolidated financial statements in conformity with
              generally accepted accounting principles.
              Actual results could differ from these estimates.

       (l)    Development Stage Enterprise

              In prior periods, the Company reported as a development stage
              enterprise. With the signing of a commercialization agreement for
              NOVASTAN(R), the Company began reporting as an operating company
              during the third quarter of 1997.

(2)    CAPITAL STOCK

       In December, 1993, the Company completed an initial public offering
       comprised of 4,082,500 units, each unit consisting of one share of Common
       Stock (par value $.005 per share) and one warrant to purchase one share
       of Common Stock. Proceeds to the Company were approximately $24.2
       million, net of selling expenses of approximately $3.3 million. The
       securities included in the unit subsequently separated into its Common
       Stock and warrant components. The warrants are exercisable at $8.44 per
       share. On December 13, 1998, the expiration date of the warrants was
       extended from December 14, 1998 to September 30, 1999 for those warrant
       holders electing such extension. The warrants are redeemable for $.05 per
       warrant, at the option of the Company, upon 30 days' prior written notice
       at any time after the last sale price of the Common Stock has been at
       least $11.82 for 30 consecutive business days ending within 15 days of
       the date of the notice of redemption. All of the warrants must be
       redeemed if any are redeemed. The underwriter received approximately $2.9
       million in commissions and expense reimbursement and purchased options to
       purchase 355,000 units at an exercise price of $11.14. These options were
       sold for $.001 each and expired on December 15, 1998.

       In February, 1996, the Company completed a private placement of Common
       Stock. The Company issued 6,550,990 shares of Common Stock at $2.125 per
       share with proceeds of approximately $13.0 million, net of selling
       commissions and expenses of approximately $900,000. In connection with
       the private placement, the Company paid selling commissions of $759,283
       and issued 730,461 warrants to purchase Common Stock. These warrants
       expire on February 13, 2001, with exercise prices of between $3.05 and
       $4.58 per share. The resale of the underlying Common Stock is subject to
       certain registration rights.

       On October 10, 1996 the Company signed a strategic alliance agreement and
       Common Stock purchase agreement with LG Chemical, Ltd. ("LG Chemical"), a
       Korean corporation. In conjunction with the agreement, LG Chem purchased
       1,250,000 shares of Common Stock for $4.00 per share for a total of $5
       million. The Company's agents in the contract negotiations received
       $420,000 in commissions and 113,636 warrants to purchase Common Stock,
       expiring on October 10, 2001, exercisable at $4.40 per share with the
       resale of the underlying Common Stock being subject to certain piggyback
       registration rights.



                                      F-9
<PAGE>   38

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


       On March 14, 1997, the Company completed a $6.0 million private placement
       of 5% Cumulative Convertible Preferred Stock ("the 5% Preferred"), which
       provided net proceeds to the Company of approximately $5.9 million. The
       5% Preferred was convertible into Common Stock at discounts ranging from
       6% to 17% from the average of the daily low trading price of the Common
       Stock for the ten consecutive trading days immediately preceding the
       conversion date. A total of 6,000 shares of 5% Preferred were sold at a
       price of $1,000 per share to two institutional investors. As of December
       31, 1998, 6,000 shares of the 5% Preferred and accrued dividends of
       $144,166 on such shares have been converted into 1,408,944 shares of
       Common Stock.

       During August, 1997 the Company sold 176,992 shares of Common Stock for
       $1 million less commissions and expenses of approximately $34,000
       pursuant to a commercialization agreement. See note 10.

       In October, 1997 the Company sold 5,750,000 shares of Common Stock for
       $5.00 per share pursuant to an underwritten secondary public offering.
       The net proceeds to the Company for the 5,750,000 shares sold were
       approximately $26.7 million after deducting selling commissions and
       expenses of approximately $2.1 million related to the offering.

       In addition, during October, 1997 the Company issued 214,286 shares of
       Common Stock and a warrant to purchase 142,858 shares of Common Stock
       exercisable at $14.00 per share until October 9, 2004, pursuant to a
       license agreement. See note 9.

(3)    STOCK OPTIONS AND WARRANTS

       The Company has in effect the following stock option plans:

       The Amended and Restated 1990 Incentive Stock Option Plan ("1990 Plan")
       allows for the issuance of incentive and non-qualified options to
       employees, directors, officers, non-employee independent contractors and
       non-employee directors, pursuant to which 219,397 shares of Common Stock
       are reserved for issuance out of authorized but unissued shares of the
       Company.

       The Amended and Restated 1992 Incentive Stock Option Plan ("1992 Plan")
       allows for the issuance of incentive and non-qualified options to
       employees, directors, officers, non-employee independent contractors and
       non-employee directors, pursuant to which 1,427,507 shares of Common
       Stock are reserved for issuance out of authorized but unissued shares of
       the Company.

       The Amended and Restated Stock Option Plan for Non-Employee Directors
       ("Director Plan") allows for the issuance of non-qualified options to
       non-employee directors, pursuant to which 34,242 shares of Common Stock
       are reserved for issuance out of authorized but unissued shares of the
       Company to be issued to non-employee members of the Board of Directors of
       the Company based on a formula. No new issuances are being made under the
       Director Plan.

       The Amended and Restated 1995 Stock Option Plan ("1995 Plan") allows for
       the issuance of incentive and non-qualified options, shares of restricted
       stock and stock bonuses to employees, officers, and non-employee
       independent contractors, pursuant to which 1,978,149 shares of Common
       Stock are reserved for issuance out of authorized but unissued shares of
       the Company.



                                      F-10
<PAGE>   39

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


       The Amended and Restated 1995 Non-Employee Director Stock Option Plan
       ("1995 Director Plan") allows for the issuance of non-qualified options
       to non-employee directors, pursuant to which 289,091 shares of Common
       Stock are reserved for issuance out of authorized but unissued shares of
       the Company to be issued to non-employee members of the Board of
       Directors of the Company based on a formula. In June 1996, the 1995
       Director Plan was amended with respect to the election date requirement
       for a director to request stock in lieu of cash payment of director fees.

       During December, 1996, the Compensation and Personnel Committee of the
       Board of Directors authorized the extension of options originally granted
       for a five year period to ten years upon election by individual option
       holders. During 1997, option holders elected to extend 1,022,833 options,
       originally expiring during 1997, 1998, 1999 and 2000, for an additional
       five years. Accordingly, the Company recorded a non-cash charge of
       $1,303,094 during 1997. Of the total, approximately $350,000 was charged
       to research and development expenses and the remainder to general and
       administrative expenses for the difference between the original option
       exercise price and fair market value as of the effective date of
       election.

       During March, 1999, the Board of Directors approved the 1999 Stock
       Incentive Plan (the "1999 Plan"). This plan allows for the issuance of
       incentive and non-qualified options, shares of restricted stock and stock
       bonuses to directors, employees, officers and non-employee independent
       contractors, pursuant to which 1,000,000 shares of Common Stock are to be
       reserved for issuance out of the authorized but unissued shares of the
       Company. The 1999 Plan is subject to approval of the stockholders at the
       Company's annual meeting in 1999.

       A summary of stock options as of December 31, 1998, follows:


<TABLE>
<CAPTION>
                             Exercise Price                            Exercised/                 Available
       Stock Option Plans      Per Share    Authorized    Outstanding    Other      Exercisable   for Grant
       -------------------   -------------   ----------   ----------   ----------   ----------   ----------
<S>    <C>                   <C>            <C>           <C>          <C>          <C>          <C>   
       1990 Plan             $1.38 - $5.59      285,715      175,024       66,318      166,611       44,373

       1992 Plan             $1.41 - $5.36    1,700,000    1,179,554      272,493    1,154,063      247,953

       Director Plan         $3.50 - $4.54       71,429       34,242       37,187       34,242         --

       1995 Plan             $1.31 - $8.13    2,000,000    1,770,469       21,851      659,828      207,680

       1995 Director Plan    $1.38 - $5.69      300,000      174,005       10,909      126,505      115,086

                                             ----------   ----------   ----------   ----------   ----------
                    TOTALS                    4,357,144    3,333,294      408,758    2,141,249      615,092
                                             ==========   ==========   ==========   ==========   ==========
</TABLE>

       The Company applies APB Opinion 25 and related interpretations in
       accounting for its plans. The Company has recorded deferred compensation
       for the difference between the grant price and the deemed fair value for
       financial statement presentation purposes related to certain options
       granted in the period subsequent to May 27, 1993 and prior to the initial
       public offering. Such amount totaled $287,158, of which the remaining
       balance of $46,177 was expensed during 1996. Had compensation costs for
       the Company's stock-based compensation plans been determined consistent
       with SFAS No. 123, the Company's proforma net loss and proforma net loss
       applicable to 




                                      F-11
<PAGE>   40
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


       common shares for the year ended December 31, 1998 would have been
       $16,758,119 and $0.49, respectively and for December 31, 1997 would have
       been $9,438,748 and $0.34, respectively, for December 31, 1996 would have
       been $21,057,088 and $0.89, respectively.

       The fair value of options granted during the years ended December 31,
       1998, 1997 and 1996 for employee services were estimated on the date of
       grant using the Black-Scholes Pricing Model with the following weighted
       average assumptions: risk-free interest rate of between 4.45 and 6.65
       percent, expected life of between 2 and 8 years, expected volatility of
       between 69 and 75 percent and no dividends.

       A summary of the status of the Company's stock option plans as of
       December 31, 1998, 1997 and 1996 and the changes during the years then
       ended is presented below:

<TABLE>
<CAPTION>
                                                                                           WEIGHTED-AVERAGE
                                                                         OPTIONS            EXERCISE PRICE
                                                                      ------------         -----------------
<S>                                                                     <C>                <C>   
           Outstanding at January 1, 1996.........................       2,055,431             $ 2.90

           Granted................................................         600,102               4.42
           Canceled...............................................        (294,129)              3.52
           Exercised..............................................        (192,640)              3.07
                                                                      -----------

           Outstanding at December 31, 1996.......................       2,168,764               3.22

           Granted................................................       1,682,909               4.34
           Canceled...............................................        (986,534)              3.13
           Exercised..............................................         (58,841)              3.32
           Prior Period Adjustments...............................          55,718               ---
                                                                      ------------

           Outstanding at December 31, 1997.......................       2,862,016               3.85

           Granted................................................         850,025               6.41
           Canceled...............................................        (250,800)              5.60
           Exercised..............................................        (127,947)              2.52
                                                                      ------------

           Outstanding at December 31, 1998.......................       3,333,294             $ 4.42
                                                                      ============
</TABLE>

<TABLE>
<CAPTION>
                                                                    December 31,         December 31,        December 31,
                                                                        1998                 1997                1996    
                                                                    ------------         ------------        ------------
           Weighted-average fair value of options granted
           during the period at an exercise price equal to
<S>                                                                    <C>                  <C>                 <C>   
           market at issue date...................................     $ 4.06               $ 3.45              $ 2.72
</TABLE>




                                      F-12
<PAGE>   41
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


       The following tables summarize information about the Company's stock
       options outstanding as of December 31, 1998, 1997 and 1996, respectively:

<TABLE>
<CAPTION>
                                               Weighted          Weighted                          Weighted
                              Options           Average           Average          Options          Average
             Option         Outstanding        Remaining      Exercise Price     Exercisable    Exercise Price
         Exercise Price   as of 12/31/98   Contractual Life   of Outstanding   as of 12/31/98   of Exercisable
         --------------   --------------   ----------------   --------------   --------------   --------------
<S>                         <C>            <C>                <C>              <C>              <C>  
         $1.31 - $3.50      1,141,454              4.27           $2.23          1,126,954           $2.21

         $3.51 - $5.88      1,640,190              7.21           $5.01            976,128           $4.95

         $5.89 - $8.13        551,650              9.17           $7.20             38,167           $7.19

                          -----------                                          -----------
         $1.31 - $8.13      3,333,294              6.53           $4.42          2,141,249           $3.55
</TABLE>

<TABLE>
<CAPTION>
                                               Weighted          Weighted                          Weighted
                              Options           Average           Average          Options          Average
             Option         Outstanding        Remaining      Exercise Price     Exercisable    Exercise Price
         Exercise Price   as of 12/31/97   Contractual Life   of Outstanding   as of 12/31/97   of Exercisable
         --------------   --------------   ----------------   --------------   --------------   --------------
<S>                         <C>            <C>                <C>              <C>              <C>  
         $1.31 - $3.50      1,222,528              5.16           $2.17          1,047,958           $2.28

         $3.51 - $5.88      1,639,488              7.94           $5.09            573,482           $4.75

                          -----------                                          -----------
         $1.31 - $5.88      2,862,016              6.75           $3.85          1,621,440           $3.16
</TABLE>

<TABLE>
<CAPTION>
                                               Weighted          Weighted                          Weighted
                              Options           Average           Average          Options          Average
             Option         Outstanding        Remaining      Exercise Price     Exercisable    Exercise Price
         Exercise Price   as of 12/31/96   Contractual Life   of Outstanding   as of 12/31/96   of Exercisable
         --------------   --------------   ----------------   --------------   --------------   --------------
<S>                         <C>            <C>                <C>              <C>              <C>  
         $1.31 - $3.50      1,238,673              4.39           $2.18            727,483           $2.56

         $3.51 - $5.36        930,091              6.53           $4.61            241,750           $4.94

                          -----------                                          -----------
         $1.31 - $5.36      2,168,764              5.31           $3.22            969,233           $3.15
</TABLE>



                                      F-13
<PAGE>   42
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


       The fair value of warrants issued during the years ended December 31,
       1998, 1997 and 1996 for other than employee services were estimated on
       the date of grant using the Black-Scholes Pricing Model with the
       following weighted average assumptions: risk-free interest rate of
       between 6.06 and 6.51 percent, expected life of between 3 and 7 years,
       expected volatility of between 69 and 74 percent and no dividends. No new
       warrants were issued during 1998 for either employee or non-employee
       services. Several existing warrants were exchanged by the original holder
       for the benefit of a new holder with terms identical to those of the
       original.

       The following table summarizes the status of the Company's warrants as of
       December 31, 1998, 1997 and 1996, and changes during the periods then
       ended is presented below:

<TABLE>
<CAPTION>
                                                                                         WEIGHTED-AVERAGE
                                                                         WARRANTS         EXERCISE PRICE
                                                                      --------------     ----------------
<S>                                                                    <C>               <C>    
           Outstanding at January 1, 1996.........................       4,712,066           $ 7.78

           Issued.................................................         844,097             3.89
           Forfeited..............................................           ---             ------
           Canceled...............................................        (124,732)            3.93
           Exercised..............................................         (57,274)            3.50
           Reissued...............................................         116,384             3.88
                                                                       -----------

           Outstanding at December 31, 1996.......................       5,490,541             7.23

           Issued.................................................         142,858            14.00
           Forfeited..............................................           ---             ------
           Canceled...............................................        (356,453)            3.60
           Exercised..............................................        (549,095)            3.69
           Reissued...............................................         356,453             3.60
                                                                        ----------

           Outstanding at December 31, 1997.......................       5,084,304             7.80

           Issued.................................................           ---             ------
           Forfeited..............................................         (40,662)            3.50
           Canceled...............................................      (4,366,218)            8.14
           Exercised..............................................        (304,850)            3.58
           Reissued...............................................       4,283,398             8.13
                                                                       -----------

           Outstanding at December 31, 1998.......................       4,655,972           $ 8.10
                                                                       ===========
</TABLE>

       On November 12, 1998, the Company announced an extension of the exercise
       period of the Company's publicly traded redeemable common stock purchase
       warrants from December 14, 1998 to September 30, 1999 for those warrant
       holders electing such extension. These publicly traded warrants comprise
       3,995,394 of the 4,655,972 warrants outstanding at December 31, 1998. The
       exercise price of $8.44 remains unchanged. The publicly traded warrants
       are redeemable for $.05 per warrant, at the option of the Company, upon
       30 days prior written notice at any time after the last sale price of the
       Common Stock has been at least $11.82 for 30 consecutive business days
       ending within 15 days of the date of the notice of redemption. All of the
       warrants must be redeemed if any are redeemed.

       In addition, at December 31, 1997, there were outstanding underwriter
       purchase options ("UPO's"), which were issued to the underwriters in the
       Company's initial public offering in 1993, to purchase 355,000 units at
       $11.14 each. Each unit consists of one share of Common Stock and a
       warrant to purchase one share of Common Stock at an exercise price equal
       to $11.14. The UPO's expired on December 15, 1998.



                                      F-14
<PAGE>   43
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


<TABLE>
<CAPTION>
                                                                    DECEMBER 31,         DECEMBER 31,        DECEMBER 31,
                                                                        1998                 1997                1996    
                                                                   --------------       -------------       -------------
<S>                                                                <C>                  <C>                 <C>  
           Weighted-average fair value of warrants issued during 
           the year ended at an exercise price equal to market
           price at issue date....................................      $0.00                $0.00               $0.00

           Weighted-average fair value of warrants issued during 
           the year ended at an exercise price less than market
           at issue date..........................................      $0.00                $0.00               $2.26


           Weighted-average fair value of warrants issued during 
           the year ended at an exercise price greater than
           market at issue date...................................      $0.00                $2.71               $2.17
</TABLE>

       The warrants shown above were issued in connection with equity
       transactions of the Company and, therefore, there is no effect on net
       income.

 (4)   INCOME TAXES

       The Company uses the asset and liability method of accounting for income
       taxes. Under the asset and liability method, deferred tax assets and
       liabilities are recognized for the future tax consequences attributable
       to differences between the financial statement carrying amounts of
       existing assets and liabilities and their respective tax bases and
       operating loss and tax credit carryforwards. Deferred tax assets and
       liabilities are measured using enacted tax rates expected to apply to
       taxable income in the years in which those temporary differences are
       expected to be recovered or settled. The effect on deferred tax assets
       and liabilities of a change in tax rates is recognized in income in the
       period that includes the enactment date.

       At December 31, 1998 and 1997, the net deferred tax asset, representing
       primarily net operating loss carryforwards, totaled approximately
       $29,572,000 and $23,996,000, respectively. The Company has established a
       valuation allowance for the full amount of these deferred tax assets, as
       management believes that it is not more likely than not that the Company
       will recover these assets. The Company did not incur any tax expense in
       any year due to operating losses.

       At December 31, 1998, 1997 and 1996, the Company had net operating loss
       carryforwards of approximately $54,192,000, $44,375,000 and $45,195,000,
       respectively, for federal income tax return purposes. Utilization of the
       Company's net operating loss carryforwards is subject to certain
       limitations due to specific stock ownership changes which have occurred
       or may occur. To the extent not utilized, the carryforwards will expire
       during the years beginning 2002 through 2013.




                                      F-15
<PAGE>   44
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


(5)    EQUIPMENT AND LEASEHOLD IMPROVEMENTS

       Equipment and leasehold improvements consist of the following:

<TABLE>
<CAPTION>
                                                                          December 31,1998        December 31, 1997
                                                                          ----------------        -----------------
<S>                                                                       <C>                     <C>        
       Laboratory and office equipment                                       $ 5,418,849           $ 4,665,174
       Leasehold improvements                                                  3,701,772             3,701,772
                                                                             -----------           -----------
                                                                               9,120,621             8,366,946
       Less accumulated depreciation and amortization                         (5,851,183)           (5,074,884)
                                                                             -----------           -----------
                                                                             $ 3,269,438           $ 3,292,062
                                                                             ===========           ===========
</TABLE>

(6)    COMMON STOCK RESERVED

       The Company has reserved Common Stock for issuance as of December 31,
       1998 as follows:

<TABLE>
<S>                                                                            <C>        <C>
              Stock option plans                                               3,948,386
              Common Stock issuable under licensing agreement                     71,429  See note 9.
              Publicly traded warrants outstanding                             3,995,394
              Other warrants outstanding                                         660,578
                                                                             -----------
                   Total shares reserved                                       8,675,787
                                                                             ===========
</TABLE>

       During March, 1999, the Board of Directors approved the 1999 Stock
       Incentive Plan (the "1999 Plan"). This plan allows for the issuance of
       incentive and non-qualified options, shares of restricted stock and stock
       bonuses to directors, employees, officers and non-employee independent
       contractors, pursuant to which 1,000,000 shares of Common Stock are to be
       reserved for issuance out of the authorized but unissued shares of the
       Company. The 1999 Plan is subject to approval of the stockholders at the
       Company's 1999 annual meeting.

(7)    CLINICAL RESEARCH AGREEMENTS

        On February 10, 1995, the Company entered into an agreement with
        Coromed, Inc., a contract research organization, to coordinate the
        clinical evaluation of NOVASTAN(R) as an adjunct to streptokinase in
        acute myocardial infarction ("AMI"). Coromed is responsible for managing
        all aspects of the clinical trial and making all financial remuneration
        to testing sites. The term of the agreement is 19 months, and was
        extended to 24 months by mutual agreement of both parties. The parties
        agreed to a total budget of approximately $3,196,000.

       In November, 1997, the Company entered into an agreement with Coromed,
       Inc. to coordinate the clinical evaluation of TBC11251 to determine acute
       hemodynamic efficacy and safety in congestive heart failure. The term of
       the agreement ended May 30, 1998. Coromed, Inc. is currently completing
       the final report for this study. The parties agreed to a total budget of
       $993,415.

 (8)   RESEARCH AGREEMENTS

       On October 11, 1994, the Company signed a collaborative agreement with
       Synthelabo S.A., the pharmaceutical division of L'Oreal S.A.
       ("Synthelabo") to develop and market compounds for vascular proliferative
       disease derived from the Company's research programs. The Company
       recognized income of $2,625,000 in 1996 and $625,000 in 1997. Synthelabo
       is not currently paying any research payments to the Company pursuant to
       the agreement. Synthelabo will pay royalties to TBC, based on the net 
       sales, in those geographic areas covered in the agreement. 





                                      F-16
<PAGE>   45
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


       Synthelabo also has certain termination rights pursuant to the agreement.
       Synthelabo has the right to terminate the agreement any time on or after
       October 15, 1997 for any reason and either party has the right to
       terminate the contract for breach of any material obligation. If
       Synthelabo exercises this termination right, the license granted to
       Synthelabo will terminate and TBC will pay Synthelabo a royalty on net
       sales of any products sold in a certain territory (Europe, Middle East,
       Africa and countries of the former Soviet Union) for a period of time. In
       addition, Synthelabo may, at its option, require that the technology, as
       defined in the agreement, be transferred to and the development program
       be conducted by a joint venture owned by TBC and Synthelabo should "net
       worth" of TBC, as defined in the agreement, be less than $5 million as of
       the end of any calendar quarter during the term of the agreement.

       During 1995, the Company and Synthelabo mutually agreed to exchange
       certain clinical data. During 1996, the Company signed two agreements
       with Synthelabo with respect to the supply of information related to
       certain clinical studies for NOVASTAN(R). Over the term of the agreements
       as certain milestones were met, Synthelabo committed to pay TBC up to
       $2,920,000. These payments were dependent on rate of enrollment in
       certain clinical studies, the completion of certain clinical studies and
       date of completion of certain clinical studies. As of December 31, 1998,
       TBC has recognized approximately $2,880,000 of revenue related to these
       agreements.

       On October 10, 1996, the Company signed a strategic alliance agreement
       with LG Chemical, a Korean corporation, to develop and market compounds
       derived from the Company's Endothelin Receptor and Selectin Antagonist
       for certain disease indications. Upon consummation of the transaction, LG
       Chemical purchased 1,250,000 shares of Common Stock for $4.00 per share
       for a total of $5 million. In addition, LG Chemical has committed to pay
       $10.7 million in research payments. Of this amount, $4.1 million has been
       paid (of which $1.0 million was a receivable at December 31, 1998) and
       $1.0 million will be paid on each of June 30 and December 31 of 1999 and
       2000, and $1.3 million on June 30 and December 31, 2001. LG Chemical has
       the right to terminate future research payments if TBC fails to meet
       certain milestones, which milestones will be established by the parties
       from time to time in accordance with the agreement. LG Chemical will pay
       royalties to TBC, based on net sales, in those geographic areas covered
       by the agreement, which include Korea, China, India and certain other
       Asian countries, excluding Japan. The Company will pay its agents in the
       contract negotiations, a commission on all future research payments as
       well as a royalty on net sales.

       During 1998, the Company entered into an agreement to license rights to
       certain technology related to the research programs licensed from Hedral
       Therapeutics, Inc. Upon execution of the agreement, the Company paid a
       license fee of 40,000 shares of restricted Common Stock valued at
       $133,875. The agreement includes a total of 40,000 additional shares of
       Common Stock to be paid upon reaching certain milestones and cash royalty
       payments based on net sales in the event a product is developed and
       commercialized under this agreement.

(9)    LICENSE AGREEMENT

       TBC has entered into an agreement with Mitsubishi Chemical Corporation
       ("Mitsubishi") to license Mitsubishi's rights and technology relating to
       NOVASTAN(R) and to license Mitsubishi's own proprietary technology
       developed with respect to NOVASTAN(R) (the "Mitsubishi Agreement"). Under
       the Mitsubishi Agreement, the Company has an exclusive license to use and
       sell NOVASTAN(R) in the U.S. and Canada for all specified indications.
       The Company is required to pay Mitsubishi specified royalties on net
       sales of NOVASTAN(R) by the Company and its sublicensees after its
       commercial introduction in the U.S. and Canada. Either party may
       terminate the Mitsubishi Agreement on 60 days notice if the other party
       defaults in its material obligations under the agreement, declares
       bankruptcy or is insolvent, or if a substantial portion of its property
       is subject to levy. Unless terminated sooner 





                                      F-17
<PAGE>   46
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


       pursuant to the above described termination provisions, the Mitsubishi
       Agreement expires on the later of termination of patent rights in a
       particular country or 20 years after first commercial sale of products.
       Under the Mitsubishi Agreement, TBC has access to an improved formulation
       patent granted in 1993 which expires in 2010 and a use patent which
       expires in 2009. In conjunction with the Mitsubishi Agreement, a
       consulting firm involved in negotiations related to the agreement will
       receive a percentage of net sales received as a result of the agreement.

       Mitsubishi further agreed to supply the Company with its requirements of
       bulk NOVASTAN(R) throughout the term of the Mitsubishi Agreement for
       TBC's clinical testing and commercial sales of NOVASTAN(R) in the U.S.
       and Canada. In the event Mitsubishi should discontinue the manufacture of
       NOVASTAN(R), Mitsubishi and TBC have agreed to discuss in good faith the
       means by which, and the party to whom, NOVASTAN(R) production technology
       will be transferred. The transferee may be a person or entity other than
       TBC. At present, Mitsubishi is the only manufacturer of NOVASTAN(R).
       Should Mitsubishi terminate or default in its supply commitment, there
       can be no assurance that alternate sources of bulk NOVASTAN(R) will be
       available to the Company at reasonable cost, if at all. If such alternate
       sources of supply are unavailable or uneconomic, the Company's results of
       operations would be materially adversely affected. See note 10.

       In exchange for the license to Genentech's (the "Former Licensor")
       NOVASTAN(R) technology, TBC issued the Former Licensor 285,714 shares of
       Common Stock during 1993 and issued an additional 214,286 shares of
       Common Stock on October 9, 1997, after acceptance of the filing of the
       first New Drug Application ("NDA") with the FDA for NOVASTAN(R). The
       Company recorded a $1,075,191 noncash charge to in-process research and
       development expense during the fourth quarter of 1997. An additional
       71,429 shares of Common Stock will be issued to the Former Licensor
       within ten days after the FDA's first approval of an NDA for NOVASTAN(R).
       Additionally, on October 9, 1997, upon acceptance of the filing of the
       first NDA for NOVASTAN(R) with the FDA, the Company granted the Former
       Licensor a warrant to purchase an additional 142,858 shares of Common
       Stock at an exercise price of $14.00 per share, subject to adjustment,
       which expires on October 9, 2004. The Company will not be required to
       make any cash payment if the approval of the NDA does not occur. TBC has
       also granted the Former Licensor demand and piggyback registration rights
       with regard to shares of Common Stock issued to the Former Licensor.

       During the third quarter of 1997, the Company sublicensed certain rights
       to NOVASTAN(R) to SmithKline Beecham, plc ("SmithKline"). In conjunction
       with this agreement, the Company agreed to make certain payments to
       Mitsubishi, which are included in research and development expense, to
       pay an additional royalty to Mitsubishi, beginning January 1, 2001 and to
       provide access to certain NOVASTAN(R) clinical data to Mitsubishi in
       certain circumstances. See note 10.

(10)   COMMERCIALIZATION AGREEMENT

       In connection with TBC's development and commercialization of
       NOVASTAN(R), in August, 1997, TBC entered into a Product Development,
       License and CoPromotion Agreement with SmithKline Beecham plc (the
       "SmithKline Agreement") whereby SmithKline was granted exclusive rights
       to work with TBC in the development and commercialization of NOVASTAN(R)
       in the U.S. and Canada for specified indications. SmithKline paid $8.5
       million in upfront license fees during August, 1997, a $5 million
       milestone payment in October, 1997, and will pay up to $15 million in
       additional milestone payments based on the clinical development and FDA
       approval of NOVASTAN(R) for the heparin-induced thrombocytopenia ("HIT")
       and HIT with thrombosis syndrome ("HITTS") and AMI indications. Future
       milestone payments for the AMI indication are subject to SmithKline's
       agreement to market NOVASTAN(R) for such indication. The parties have
       also formed a joint development committee to analyze 





                                      F-18
<PAGE>   47
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


       the development of additional NOVASTAN(R) indications to be funded 60% by
       SmithKline except for certain Phase IV trials which shall be funded
       entirely by SmithKline. At this time, SmithKline has no plans to conduct
       development work for the AMI and stroke indications. TBC is evaluating
       the feasibility of development of NOVASTAN(R) for stroke and possibly
       AMI. SmithKline has the exclusive right to commercialize all products
       arising out of the collaboration, subject to the obligation to pay
       royalties on net sales to TBC and to the rights of TBC to copromote these
       products through its own sales force in certain circumstances. TBC will
       retain the rights to any indications which SmithKline determines it does
       not wish to pursue, subject to the requirement that TBC must use its own
       sales force to commercialize any such indications. Any indications which
       TBC elects not to pursue will be returned to Mitsubishi. In conjunction
       with the SmithKline Agreement, a consulting firm involved in negotiations
       related to the agreement will receive a percentage of all consideration
       received by TBC as a result of the agreement.

       At present, Mitsubishi is the only manufacturer of NOVASTAN(R), and has
       entered into the Mitsubishi Supply Agreement with SmithKline to supply
       NOVASTAN(R) in bulk in order to meet SmithKline's and TBC's needs under
       the SmithKline Agreement. Should Mitsubishi fail during any consecutive
       nine-month period to supply SmithKline at least 80% of its requirements,
       and such requirements cannot be satisfied by existing inventories, the
       Mitsubishi Supply Agreement provides for the nonexclusive transfer of the
       production technology to SmithKline. If SmithKline cannot commence
       manufacturing of NOVASTAN(R) or alternate sources of supply are
       unavailable or uneconomic, the Company's results of operations would be
       materially and adversely affected.

       The SmithKline Agreement generally terminates on a country by country
       basis upon the earlier of the termination of TBC's rights under the
       Mitsubishi Agreement, the expiration of applicable patent rights or, in
       the case of royalty payments, the commencement of substantial third-party
       competition. SmithKline also has the right to terminate the agreement on
       a country by country basis by giving TBC at least three months written
       notice at any time before SmithKline first markets products in that
       country based on a reasonable determination by SmithKline that the
       commercial profile of the product in question would not justify continued
       development in that country. SmithKline has similar rights to terminate
       the SmithKline Agreement on a country by country basis after marketing
       has commenced. In addition, either party may terminate the SmithKline
       Agreement on 60 days notice if the other party defaults in its
       obligations under the agreement, declares bankruptcy or is insolvent.

       In connection with the execution of the SmithKline Agreement, SmithKline
       purchased 176,992 shares of TBC's Common Stock for $1.0 million and
       additional 400,000 shares of Common Stock for $2.0 million in connection
       with the secondary public offering, which closed on October 1, 1997.

(11)   REGULATORY FILING

       During August, 1997, the Company filed a new drug application ("NDA")
       with the United States Food and Drug Administration (the "FDA") for its
       lead product candidate, NOVASTAN(R), for use as an anticoagulant in
       patients with HIT and HITTS. During September, 1997, the FDA granted
       priority review status to the new drug application for NOVASTAN(R).
       During October, 1997, the Company was notified by the FDA that the filed
       NDA for NOVASTAN(R) was accepted. The FDA extended the priority review
       period by 90 days during January, 1998. On May 11, 1998, the Company
       announced that it had received a non-approvable letter from the FDA for
       NOVASTAN(R). Based on consultation with representatives from the FDA, TBC
       has focused on the collection and analysis of a new more comparable
       historical control group as the basis for demonstrating the safety and
       efficacy NOVASTAN(R). The Company amended its NDA with the FDA for
       NOVASTAN(R) as an anticoagulant for use in patients with HIT syndrome on
       March 19, 1999.



                                      F-19
<PAGE>   48
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


(12)   401(k) PLAN

       The Company adopted a 401(k) plan which became effective on September 1,
       1993. Under the plan, all employees with three months of service are
       eligible to participate in the plan and may contribute up to 15 percent
       of their compensation, with a maximum of $10,000 per employee in 1998. At
       the present time, no matching contributions have been authorized by the
       Board of Directors. Costs associated with administering the plan totaled
       approximately $10,000 in 1998.

(13)   COMMITMENTS AND CONTINGENCIES

       a)     Employment Agreements

              Since inception, the Company has entered into employment
              agreements with certain officers and key employees. The Company
              has signed agreements with six of its officers to provide certain
              benefits in the event of a "change of control" as defined in these
              agreements and the occurrence of certain other events. The
              agreements provide for a lump-sum payment in cash equal to
              eighteen (18) months to three (3) years of annual base salary and
              annual bonus, if any. The base salary portion of the agreements
              would aggregate approximately $2.5 million at the current rate of
              compensation. In addition, the agreements provide for gross-up for
              certain taxes on the lump-sum payment, continuation of certain
              insurance and other benefits for periods of eighteen (18) months
              to three (3) years and reimbursement of certain legal expenses in
              conjunction with the agreements. These provisions are intended to
              replace compensation continuation provisions of any other
              agreement in effect for an officer if the specified event occurs.

       (b)    Lease Agreements

              The Company renegotiated its noncancelable lease agreement which
              began December 1, 1990 for its facilities in Houston, Texas and
              executed a new lease agreement. The new lease was effective
              January 1, 1995 and calls for a lease term of six years at an
              annual rate of $712,449 through December 2000, subject to
              adjustments based on certain variable building operating expenses.
              For the years ended December 31, 1998, 1997, 1996, rent and
              related building services totaled approximately $958,000, $956,000
              and $1,025,000, respectively, of which approximately $820,000,
              $851,000 and $924,000, respectively, was charged to research and
              development expense.

              Total committed lease payments from January 1, 1999 through
              December 31, 2000 equal $1,418,483. The Company executed a letter
              of intent to lease additional space, which will cost approximately
              $14,000 per month, upon completion of improvements to the space.
              The Company has also committed to pay for seventy-four parking
              spaces during the lease at the facility established rate charged,
              which currently approximates $44,000 per annum. The lease also
              includes a provision for the Company to pay certain additional
              charges to obtain utilities and building services during
              off-business hours. Currently, the amount of these charges is
              approximately $250,000 per annum, payable in monthly installments.
              These charges are subject to annual adjustments based on the local
              consumer price index. Should the Company terminate the use of
              non-standard services, an additional amount of up to $4,167 per
              month shall be due in addition to base rent on the remaining lease
              payments through December 2000. In addition, the lease grants
              certain credits to rent and utilities which at December 31, 1998
              totaled approximately $109,000, and which are being amortized on a
              straight line basis over the lease term.



                                      F-20
<PAGE>   49
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

       c)     Legal Proceedings

              On November 21, 1994, a class action shareholders' suit was filed
              in the United States District Court for the Southern District of
              Texas, Houston Division seeking damages in the amount of $16
              million. Plaintiffs are two individuals who purchased shares of
              the Company on December 16, 1993 following the Company's initial
              public offering ("IPO"). In their complaint, plaintiffs have sued
              the Company, certain members of the board of directors and certain
              officers alleging violations of Sections 11, 12 and 15 of the
              Securities Act of 1933, as amended (the "Act"). Plaintiffs have
              also named David Blech, D. Blech & Co. and Isaac Blech as
              defendants. On January 23, 1995, the Company and the members of
              the board of directors filed a motion to dismiss the plaintiffs'
              complaint pursuant to Rule 9(b) and Rule 12b(6) of the Federal
              Rules of Civil Procedure. In addition, defendant John Pietruski,
              Chairman of the Board of Directors, filed a motion to dismiss the
              plaintiffs' complaint pursuant to Rule 12(b)(2) of the Federal
              Rules of Civil Procedure. The Court denied the motion by the
              Company and by John Pietruski.

              On March 28, 1995, a second class action shareholders' suit was
              filed in the United States District Court for the Southern
              District of New York seeking unspecified damages. Plaintiffs are
              eight individuals who purchased shares in various companies for
              which D. Blech & Co. acted as an underwriter (or co-underwriter)
              or marketmaker. In their complaint, the plaintiffs have sued the
              Company alleging violations of Section 10(b) of the Securities
              Exchange Act of 1934, as Amended (the "Exchange Act") and Rule
              10b-5 promulgated thereunder by the Securities and Exchange
              Commission (the "Commission"). Plaintiffs named a number of
              defendants, including David Blech and D. Blech & Co., four
              individuals, two brokerage firms, one investment management
              company and ten other companies for which D. Blech & Co. acted as
              underwriter or marketmaker. On June 6, 1996, the Court dismissed
              all of the Exchange Act and common law fraud claims filed against
              the Company and its officers and directors, but afforded those
              plaintiffs the right to attempt to preserve those claims by
              repleading them. The Court ordered that those claims be repleaded
              no later than July 26, 1996. Plaintiffs did not replead those
              claims by the deadline, resulting in the dismissal of all claims
              against the Company in this litigation.

              On August 14, 1995, the Judicial Panel on Multi-District
              Litigation ordered that the action filed in the United States
              District Court for the Southern District of Texas, Houston
              Division be transferred to the United States District Court for
              the Southern District of New York for coordinated or consolidated
              pretrial proceedings with the related actions pending there. In
              light of the transfer and consolidation, the Company requested
              that the New York Court reconsider the Texas Court's denial of its
              motion to dismiss as a part of the Court's consideration of
              similar motions to dismiss filed by the other defendant companies
              for which D. Blech & Co. acted as underwriter. All of these
              motions were presented to the Court on February 6, 1996. On June
              6, 1996, the New York Court granted the Company's and its
              officers' and directors' motion for reconsideration, but together
              with all other similar pending motions, denied the requested
              relief. Pursuant to the court's order, the Company therefore filed
              an answer in the case. The Company also filed a Motion seeking
              leave of court to prosecute an immediate appeal of the Court's
              denial of the Company's Motion to Dismiss. The Court heard
              argument on that Motion on October 10, 1996. The motion was denied
              on January 16, 1997. On February 3, 1999, the New York Court
              certified the action as a class action. The Company is unable to
              evaluate its potential outcome at this time. The Company disputes
              these claims and intends to contest them vigorously. There can be
              no assurance, however that the final disposition of this case will
              be favorable to the Company.


                                      F-21
<PAGE>   50
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


(14)   SHORT TERM NOTE RECEIVABLE

       On April 12, 1994, the Company loaned $350,000 to D. Blech and Company,
       Incorporated in exchange for a non-interest bearing promissory note of
       even amount. The loan represented advance payment of a success fee
       pursuant to a consulting agreement with D. Blech and Company,
       Incorporated payable in connection with the IPI acquisition. See note 15.
       As of December 31, 1997, $227,500 of the fee had been earned. The
       remaining amount of the note would have been considered earned as fees
       upon issuance of the remaining Company stock related to the IPI
       acquisition upon the satisfaction of the conditions to issuance. Since
       the conditions were not met, the remaining $122,500 was due. This amount
       was deemed uncollectible and was charged to expense in the year ended
       December 31, 1997.

(15)   ACQUISITION OF IMMUNOPHARMACEUTICS, INC.

       On July 25, 1994, the Company acquired all of the outstanding Common
       Stock of IPI in exchange for Common Stock of the Company. TBC issued (i)
       1,599,958 shares of Common Stock which was distributed to the existing
       IPI shareholders, (ii) 999,956 shares of Common Stock, issued in the
       names of IPI shareholders that was held in escrow pending satisfaction of
       certain research and development milestones and released from escrow on
       June 30, 1995, and (iii) contingent stock issue rights to issue an
       aggregate of 1,400,000 shares of Common Stock, the conversion of which
       was pending satisfaction of research and development milestones, in
       exchange for all the issued and outstanding shares of IPI (after
       conversion of the IPI Series A and Series B preferred stock and all
       options and warrants). On June 30, 1995, the Company issued 399,961
       shares pursuant to the contingent stock issue rights, upon attainment of
       certain research and development milestones.

       The acquisition of IPI was accounted for under the purchase method of
       accounting. The aggregate purchase price (consisting of the fair value of
       non-contingent TBC shares issued, transaction expenses and liabilities
       assumed) was allocated to the tangible and intangible assets acquired
       based on their estimated fair value as of the date of the acquisition.
       The Common Stock issued on July 25, 1994 was valued at $3.63 per share,
       which was derived by discounting the value of the TBC shares without the
       attached warrant on July 25, 1994. The Common Stock issued on June 30,
       1995 and the Common Stock released from escrow was valued at $1.41 per
       share, which was derived by discounting the value of the TBC shares on
       June 30, 1995. During the second quarter of 1995, the Company charged
       $1,973,883 to in-process research and development expense which
       represented the value of the 1,399,917 shares of TBC Common Stock
       (including 999,956 shares released from escrow and 399,961 shares issued
       pursuant to the contingent stock issue rights) given as consideration for
       acquired technology. The value of the remaining shares issuable upon
       conversion of the contingent stock issue rights will be determined when
       the research and development milestones are met by IPI, if ever, and
       additional in-process research and development expense will be recorded
       at such time. During 1996, the Company determined that the contractual
       requirements for issuance of additional shares pursuant to the contingent
       stock issue rights had not been met. The Company received notification
       from the committee representing former IPI shareholders that it did not
       agree with this determination. Any further discussion would be by
       arbitration pursuant to the Acquisition Agreement. The Company
       consolidated the IPI operation into TBC's in the first half of 1996. The
       Company believes that $643,750 of goodwill was impaired due to the
       decision to cease operations at IPI and the sale of the QED business unit
       and has charged it to expense in the year ended December 31, 1995. The
       restructuring costs associated with the consolidation of the IPI
       operation were approximately $421,000 and were expensed in 1996. These
       costs included waste disposal, future lease commitments, severance pay
       and related taxes.


                                      F-22
<PAGE>   51




                                INDEX TO EXHIBITS

<TABLE>
<CAPTION>
   Exhibit No                             Description of Exhibit
   ----------                             ----------------------
<S>               <C> 
    2.1  (7)*     Plan and Agreement of Merger, dated June 17, 1994, among the Company, TBC Acquisition Company No. 1
                  and certain major shareholders of ImmunoPharmaceutics, Inc.

    3.1  (1)      Certificate of Incorporation, as amended

    3.2  (1)      By-laws, as amended

    3.3  (1)      Amendment to Article IV of By-laws

    3.4  (9)      Amendment to the Certificate of Incorporation dated November 30, 1993

    3.5  (9)      Amendment to the Certificate of Incorporation dated May 20, 1994

    3.6  (15)     Certificate of Amendment of Certificate of Incorporation

    3.7  (16)     Amended and Restated By-laws of Texas Biotechnology Corporation

    4.1  (1)      Article II of the By-laws

    4.4  (1)      Agreement with Dr. James T. Willerson dated March 6, 1990

    4.5  (1)      Agreement with Dr. Richard Dixon dated February 23, 1990

    4.6  (6)      Form of Warrant Agreement (with Form of Warrant)

    4.8  (17)     Certificate of Designations of 5% Cumulative Convertible Preferred Stock for Texas Biotechnology
                  Corporation

   10.3  (1)      Employment Agreement with Dr. Richard A.F. Dixon dated July 15, 1990

   10.4  (1)      Consulting Agreement with Dr. James T. Willerson dated January 1, 1990

   10.6  (1)      Consulting Agreement with Mr. John M. Pietruski dated January 1, 1992

   10.11 (2)      Employment Agreement with David B. McWilliams dated July 15, 1992

   10.12 (3)      Consulting Agreement with Hennessey & Associates, Ltd.

   10.17 (4)(5)*  Sublicense and License Agreement dated May 27, 1993 between Company and Genentech, Inc., together with
                  exhibits

   10.18 (4)*     Stock Agreement dated May 27, 1993 between the Company and Genentech, Inc.

   10.27 (8)*     License and Research and Development Agreement between the Company and Synthelabo S.A. dated October
                  11, 1994 (the "License Agreement"), Schedule 1 - Patent Applications, Schedule 1.27 - Territories, and
                  Schedule 3.2(c) - Work Plan for the Company's Restenosis Program

                  -   Schedule 1 - Patent Applications.

                  -   Schedule 1.27 - Territories.

                  -   Schedule 3.2(c) - Work Plan for the Company's Restenosis Program.

   10.31 (10)     Lease Agreement dated, February 24, 1995 between Texas Biotechnology Corporation and Doctors Center,
                  Inc.

   10.33 (10)     Amended and Restated 1990 Incentive Stock Option Plan

   10.34 (10)     Amended and Restated 1992 Incentive Stock Option Plan (as of March 3, 1995)

   10.36 (10)     Employment Agreement, dated February 7, 1995 between Richard P. Schwarz Jr., Ph.D. and
                  Texas Biotechnology Corporation

   10.38 (11)     Clinical Trial Research Agreement dated February 10, 1995
                  between Texas Biotechnology Corporation and Coromed, Inc.

   10.39 (12)     Amended and Restated Stock Option Plan for Non-Employee
                  Directors

   10.40 (12)    1995 Stock Option Plan
</TABLE>



<PAGE>   52
<TABLE>
<CAPTION>                                        
<S>               <C> 
   10.42  (13)    Clinical Trial Research Agreement dated April 1, 1995
                  between Texas Biotechnology Corporation and Coromed, Inc.

   10.43  (13)    Clinical Trial Research Agreement dated June 1, 1995
                  between Texas Biotechnology Corporation and Coromed, Inc.

   10.46  (13)    Employee Agreement with Stephen L. Mueller and Texas
                  Biotechnology Corporation dated July 1, 1995.

   10.47  (13)    Employee Agreement with David B. McWilliams and Texas Biotechnology 
                  Corporation dated July 1, 1995.

   10.48  (13)    Employee Agreement with Richard A. F. Dixon, Ph.D. and
                  Texas Biotechnology Corporation dated July 1, 1995.

   10.49  (13)    Employee Agreement with Richard P. Schwarz, Jr., Ph. D. and
                  Texas Biotechnology Corporation dated July 1, 1995.

   10.50  (13)    Employee Agreement with Joseph M. Welch and Texas
                  Biotechnology Corporation dated July 1, 1995.

   10.51  (14)*   Letter Agreement regarding Argatroban Studies
                  Information dated December 14, 1995, between the Company and
                  Synthelabo Recherche

   10.52  (14)    Amendment B to Clinical Trial Research Agreement dated
                  February 10, 1995 between Texas Biotechnology Corporation
                  and Coromed Inc.

   10.53  (15)    Letter of Understanding between Texas Biotechnology Corporation and
                  and Mitsubishi Chemical Corporation dated July 10, 1996

   10.54  (15)    Form of Indemnification Agreement between Texas Biotechnology
                  Corporation and its officers and directors dated May 3, 1996

   10.55  (15)    Amended and Restated 1995 Non-Employee Director Stock
                  Option Plan (as amended by the Board of Directors on June 30,
                  1996)

   10.56  (16)*   Strategic Alliance Agreement between Texas Biotechnology Corporation and LG
                  Chemical, Ltd. dated October 10, 1996

   10.57  (16)    Common Stock Purchase Agreement between Texas Biotechnology Corporation and
                  LG Chemical, Ltd. dated October 10, 1996

   10.58  (18)    Third Amendment dated January 1, 1997 to Consulting
                  Agreement with John M. Pietruski dated January 1, 1992.

   10.59  (18)    Amendment to License and Research and Development Agreement between the
                  Company and Synthelabo S.A.

   10.60  (17)    Preferred Stock Investment Agreement dated March 13, 1997 between Texas
                  Biotechnology Corporation and certain investors

   10.61  (17)    Registration Rights Agreement dated March 13, 1997 between Texas Biotechnology
                  Corporation and certain investors
</TABLE>


<PAGE>   53

<TABLE>
<CAPTION>  
<S>               <C> 
   10.62 (19)     Amendment to the 1995 Stock Option Plan of Texas Biotechnology Corporation
                  dated March 4, 1997

   10.63 (20)     Amendment to the 1995 Non-Employee Director Stock Option Plan of Texas
                  Biotechnology Corporation dated March 4, 1997

   10.65          Employee Agreement with Dr. John McMurdo and Texas Biotechnology Corporation dated December 10, 1998

   10.66          Agreement between Joseph M. Welch and Texas Biotechnology Corporation dated June 1, 1993.

   10.67          First Amendment to Warrant Agreement dated November 12, 1998.

   99.1  (20)     Agreement between Mitsubishi Chemical Corporation, Texas Biotechnology Corporation and SmithKline
                  Beecham plc dated February 26, 1998

   99.2  (20)     Product Development License and Co-Promotion Agreement between Texas Biotechnology Corporation and
                  SmithKline Beecham plc dated August 5, 1997

   99.3  (20)     Common Stock Purchase Agreement between Texas Biotechnology Corporation and SmithKline Beecham plc
                  dated August 5, 1997

   23.1           Independent Auditors' Consent

   27.1           Financial Data Schedule
</TABLE>


- ------------

*      The Company has omitted certain portions of these agreements in reliance
       on Rule 24b-2 under the Securities and Exchange Act of 1934, as amended.

(1)    Filed as an exhibit to the Company's Form 10 (File No. 0-20117) effective
       June 26, 1992 (as amended) and incorporated herein by reference.

(2)    Filed as an exhibit to the Company's Form 10-Q (File No. 0-20117) for the
       quarter ended June 30, 1992 and incorporated herein by reference.

(3)    Filed as an exhibit to the Company's Form 10-Q (File No. 0-20117) for the
       quarter ended September 30, 1992 and incorporated herein by reference.

(4)    Filed as an exhibit to the Company's Form 10-Q (File No. 0-20117) for the
       quarter ended June 30, 1993 and incorporated herein by reference.

(5)    Filed as an exhibit to the Company's Form 10-Q/A-1 (File No. 0-20117) for
       the quarter ended June 30, 1993 and incorporated herein by reference.

(6)    Filed as an exhibit to the Company's Form S-1 registration statement No.
       33-70994 (File No. 0-20117) effective December 15, 1993 (as amended) and
       incorporated herein by reference.

(7)    Filed as an exhibit to the Company's Form 8-K (File No. 0-20117) filed
       with the Securities and Exchange Commission (the "Commission") on October
       5, 1994 (as amended) and incorporated herein by reference.

(8)    Filed as an exhibit to the Company's Form 8-K/A (File No. 0-20117) filed
       with the Commission on March 13, 1995 (as amended) and incorporated
       herein by reference.

(9)    Filed as an exhibit to the Company's Form 10-Q (File No. 0-20117) filed
       with the Commission on November 14, 1994.

(10)   Filed as an exhibit to the Company's Form 10-K (File No. 0-20117) for the
       year ended December 31, 1994 and incorporated herein by reference.

(11)   Filed as an exhibit to the Company's Form 10-Q (File No. 0-20117) for the
       quarter ended March 31, 1995 and incorporated herein by reference.



<PAGE>   54

(12)   Filed as an exhibit to the Company's Form 10-Q (File No. 0-20117) for the
       quarter ended June 30, 1995 and incorporated herein by reference.

(13)   Filed as an exhibit to the Company's Form 10-Q (File No. 1-12574) for the
       quarter ended September 30, 1995 and incorporated herein by reference.

(14)   Filed as an exhibit to the Company's Form 10-Q (File No. 1-12574) for the
       quarter ended March 31, 1996 and incorporated herein by reference.

(15)   Filed as an exhibit to the Company's Form 10-Q (File No. 1-12574) for the
       quarter ended June 30, 1996 and incorporated herein by reference.

(16)   Filed as an exhibit to the Company's Form 10-Q (File No. 1-12574) for the
       quarter ended September 30, 1996 and incorporated herein by reference.

(17)   Filed as an exhibit to the Company's Form 8-K (File No. 1-12574) with the
       Commission on April 2, 1997 and incorporated herein by reference.

(18)   Filed as an exhibit to the Company's Form 10-K (File No. 1-12574) for the
       year ended December 31, 1996 with the Commission on March 11, 1997 and
       incorporated herein by reference.

(19)   Filed as an exhibit to the Company's Form 10-Q (File No. 1-12574) for the
       quarter ended June 30, 1997 with the Commission on August 14, 1997 and
       incorporated herein by reference.

(20)   Filed as an exhibit to the Company's Form 8-K (File No. 1-12574) with the
       Commission on August 25, 1997 and incorporated herein by reference.



<PAGE>   1
                                                                   EXHIBIT 10.65

                              TERMINATION AGREEMENT



       THIS TERMINATION AGREEMENT, dated as of December 10, 1998 is made and
entered into by and between Texas Biotechnology Corporation, a Delaware
corporation with its principal office at 7000 Fannin, Suite 1920, Houston, Texas
(the "Company"), and John McMurdo, M.D. ("Executive").


                                    RECITALS

       A. Company desires to enter into an agreement with Executive whereby
severance benefits will be paid to Executive on a change in control of the
Company and consequent actual or constructive termination of Executive's
employment.

       B. This Agreement sets forth the severance benefits which the Company
agrees that it will pay to the Executive if Executive's employment with the
Company terminates under one of the circumstances described herein following a
Change in Control of the Company.

       NOW, THEREFORE, in consideration of the foregoing premises and the mutual
convenants contained herein, the parties hereto agree as follows:

       1. Term of Agreement. This Agreement shall be effective immediately on
the date hereof and shall continue in effect through December 31, 1999;
provided, however, that commencing on January 1, 2000 and each January 1
thereafter, the term of this Agreement shall automatically be extended for one
additional year unless not later than September 30 of the preceding year, the
Company shall have given notice that it does not wish to extend this Agreement;
provided, further, that notwithstanding any such notice by the Company not to
extend this Agreement shall automatically be extended for 24 months beyond the
term provided herein if a Change in Control, as defined in Section 3 of this
Agreement has occurred during the term of this Agreement.

       2. Effect on Employment Rights. This Agreement is not part of any
employment agreement that the Company and Executive may have entered. Nothing in
this Agreement shall confer upon Executive any right to continue in the employ
of the Company or interfere with or restrict in any way the rights of the
Company, which are hereby expressly reserved, to terminate for any reason, with
or without cause.

       Executive agrees that, subject to the terms and conditions of this
Agreement, in the event of a potential change in control of the Company (as
defined below), Executive will remain in the employ of the Company during the
pendency of any such potential change in control and for a period of one year
after the occurrence of an actual Change in Control. For this purpose, a
"potential change in control of the Company" shall be deemed to have occurred if
(a) the Company enters into an agreement, the consummation of which would result
in the occurrence of a Change in Control, (b) any person (including the Company)
publicly announces an intention to take or consider taking action which if
consummated would constitute a Change in Control or (c) the Board of Directors
of the Company (the "Board") adopts a resolution to the effect that a potential
change in control of the Company has occurred.



                                       1
<PAGE>   2
       3. Change in Control. For purposes of this Agreement, a "Change in
Control" of the Company shall be deemed to have occurred if any of the events
set forth in any one of the following paragraphs shall occur:

              (a) any "person" (as defined in section 3(a) (9) of the Securities
       Exchange Act of 1934, as amended (the "Exchange Act") and as such term is
       modified in sections 13(d) and 14(d) of the Exchange Act), excluding the
       Company or any of its subsidiaries, a trustee or any fiduciary holding
       securities under an employee benefit plan of the Company of any of its
       subsidiaries, an underwriter temporarily holding securities pursuant to
       an offering of such securities or a corporation owned, directly or
       indirectly, by stockholders of the Company in substantially the same
       proportions as their ownership of the Company, is or becomes the
       "beneficial owner" (as defined in Rule 13d-3 under the Exchange Act),
       directly or indirectly, of securities of the Company representing 30% or
       more of the combined voting power of the Company's then outstanding
       securities; or

              (b) during any period of not more than two consecutive years,
       individuals who at the beginning of such period constitute the Board and
       any new director (other than a director designated by a Person who has
       entered into an agreement with the Company to effect a transaction
       described in clause (a), (c) or (d) of this paragraph) whose election by
       the Board or nomination for election by the Company's stockholders was
       approved by a vote of at least two-thirds (2/3) of the directors then
       still in office who either were directors at the beginning of the period
       or whose election or nomination for election was previously so approved,
       cease for any reason to constitute a majority thereof; or

              (c) the shareholders of the Company approve a merger or
       consolidation of the Company with any other corporation, other than (i) a
       merger or consolidation which would result in the voting securities of
       the Company outstanding immediately prior thereto continuing to represent
       (either by remaining outstanding or by being converted into voting
       securities of the surviving entity), in combination with the ownership of
       any trustee or other fiduciary holder of securities under an employee
       benefit plan of the Company, at least 50% of the combined voting power of
       the voting securities of the Company or such surviving entity outstanding
       immediately after such merger or consolidation, or (ii) a merger or
       consolidation effected to implement a recapitalization of the Company (or
       similar transaction) in which no person acquires more than 50% of the
       combined voting power of the Company's then outstanding securities; or

              (d) the shareholders of the Company approve a plan of complete
       liquidation of the Company or an agreement for the sale or disposition by
       the Company of all or substantially all of the Company's assets.

       Notwithstanding the foregoing, no Change in Control shall be deemed to
       have occurred if there is consummated any transaction or series of
       integrated transactions immediately following which, in the judgment of
       the Compensation Committee of the Board, the holders of the Company's
       Common Stock immediately prior to such transaction or series of
       transactions continue to have the same proportionate ownership in an
       entity which owns all or substantially all of the assets of the Company
       immediately prior to such transaction or series of transactions.

       4. Termination of Employment Following a Change in Control. Executive
shall be entitled to the benefits provided in Section 5 hereof upon the
subsequent termination of 




                                       2
<PAGE>   3

Executive's employment by the Company within two years after a Change in Control
which occurs during the term of this Agreement, provided such termination is (a)
by the Company other than for cause, as defined below, or (b) by Executive for
Good Reason, as defined below. Executive shall not be entitled to the benefits
of Section 5, any other provision hereof to the contrary notwithstanding, if
Executive's employment terminates: (i) pursuant to Executive retiring at age 65,
(ii) by reason of Executive's total and permanent disability, or (iii) by reason
or Executive's death. As used herein, "total and permanent disability" means a
condition which prevents Executive from performing to a significant degree the
essential duties of his or her position and is expected to be of long-term
duration or result in death. A determination of total and permanent disability
must be based on competent medical evidence.

              (a)   Cause.

              (i) Definition. Termination by the Company of Executive's
       employment for Cause shall mean termination upon Executive's willful
       engaging in misconduct which is demonstrably and materially injurious to
       the Company and its subsidiaries taken as a whole. No act, or failure to
       act, on Executive's part shall be considered "willful" unless done, or
       omitted to be done, by Executive not in good faith and without reasonable
       belief that Executive's action or omission was in the best interest of
       the Company or its subsidiaries. Notwithstanding the foregoing, Executive
       shall not be deemed to have been terminated for Cause unless and until
       there shall have been delivered to Executive a copy of a resolution duly
       adopted by the affirmative vote of not less than three quarters of the
       entire membership of the Board at a meeting of the Board called and held
       for the purpose of making a determination of whether Cause for
       termination exists (after reasonable notice to Executive and an
       opportunity for Executive to be heard before the Board), finding that in
       the good faith opinion of the Board Executive was guilty of misconduct as
       set forth above in this subsection 4(a)(i) and specifying the particulars
       thereof in detail.

              (ii) Remedy by Executive. If the Company gives Executive a Notice
       of Termination which states that the basis for terminating Executive's
       employment is Cause, Executive shall have ten days after receipt of such
       Notice to remedy the facts and circumstances which provided Cause. The
       Board (or any duly authorized Committee thereof) shall make a good faith
       reasonable determination immediately after such ten-day period whether
       such facts and circumstances have been remedied and shall communicate
       such determination in writing to Executive. If the Board determines that
       an adequate remedy has not occurred, then the initial Notice of
       Termination shall remain in effect.

              (b) Good Reason. After a Change in Control, Executive may
       terminate employment with the Company at any time during the term of this
       Agreement if Executive has made a good faith reasonable determination
       that Good Reason exists for this termination.

                    (i) Definition. for purposes of this Agreement, "Good
              Reason" shall mean any of the following actions, if taken without
              the express written consent of Executive:

                    A. any material change by the Company in Executive's
              functions, duties, or responsibilities which change would cause
              Executive's position with the Company to become of less dignity,
              responsibility, importance, or scope from the position and
              attributes that applied to Executive immediately prior to the
              Change in Control;



                                       3
<PAGE>   4

                    B. any significant reduction in Executive's base salary,
              other than a reduction effected as part of an across-the-board
              reduction affecting all executive employees of the Company;

                    C. any material failure by the Company to comply with any of
              the provisions of this Agreement (or of any employment agreement
              between the parties);

                    D. the Company's requiring Executive to be based at any
              office or location more than 45 miles from the home at which the
              Executive resides on the date immediately preceding the Change in
              Control, except for travel reasonably required in the performance
              of Executive's responsibilities and commensurate with the amount
              of travel required of Executive prior to the Change in Control; or

                    E. any failure by the Company to obtain the express
              assumption of this Agreement by any successor or assign of the
              Company.

                    Executive's right to terminate employment for Good Reason
              pursuant to this subsection 4(b)(I) shall not be affected by
              Executive's incapacity due to physical or mental illness.

                    (ii) Remedy by Company. If Executive gives the Company a
              Notice of Termination which states that the basis for Executive's
              termination of employment is Good Reason, the Company shall have
              ten days after receipt of such Notice to remedy the facts and
              circumstances which provided Good Reason. Executive shall make a
              good faith reasonable determination immediately after such ten-day
              period whether such facts and circumstances have been remedied and
              shall communicate such determination in writing to the Company. If
              Executive determines that adequate remedy has not occurred, then
              the initial Notice of Termination shall remain in effect.

                    (iii) Determination by Executive Presumed Correct. Any
              determination by Executive pursuant to this Section 4(b) that Good
              Reason exists for Executive's termination of employment and that
              adequate remedy has not occurred shall be presumed correct and
              shall govern unless the party contesting the determination shows
              by a clear preponderance of the evidence that it was not a good
              faith reasonable determination.

                    (iv) Severance Payment Made Notwithstanding Dispute.
              Notwithstanding any dispute concerning whether Good Reason exists
              for termination of employment or whether adequate remedy has
              occurred, the Company shall immediately pay to Executive, as
              specified in Section 5, any amounts otherwise due under this
              Agreement. Executive may be required to repay such amounts to the
              Company if any such dispute is finally determined adversely to
              Executive.

              (c) Notice of Termination. Any termination of Executive's
       employment by the Company or by Executive hereunder shall be communicated
       by a Notice of Termination to the other party hereto. For purposes of
       this Agreement, a "Notice of Termination" shall mean a written notice
       which shall indicate the specific termination provisions in this
       Agreement relied upon and which sets forth (i) in reasonable detail the
       facts and 




                                       4
<PAGE>   5

       circumstances claimed to provide a basis for termination of Executive's
       employment under the provision so indicated and (ii) the date of
       Executive's termination of employment, which shall be no earlier than 10
       days after such Notice is received by the other party. Any purported
       termination of the Executive's employment by the Company which is not
       effected pursuant to a Notice of Termination satisfying the requirements
       of this Agreement shall not be effective. In the case of a termination
       for Cause, the Notice of Termination shall also satisfy the requirements
       set forth in Section 4(a)(i).

       5. Severance Payment Upon Termination of Employment. If Executive's
employment with the Company is terminated during the term of this Agreement and
after a Change in Control (a) by the Company other than for Cause, or (b) by
Executive for Good Reason, then Executive shall be entitled to the following:

              (a) Lump-Sum Severance Payment. In lieu of any further salary
       payments to the Executive for periods subsequent to the Date of
       Termination, the Company shall pay to the Executive a lump sum severance
       payment, in cash, equal to one and one half (1.5) (or, if less, the
       number of years, including fractions, from the Date of Termination until
       the Executive would have reached age sixty-five (65)) times the sum of
       (a) the Executive's Annual Base Salary in effect on date of termination
       and (b) the Executive's most recent Annual Bonus. If the most recent
       Annual Bonus was a stock option or a stock grant, the value of the bonus
       will be deemed to be the number of option shares times the closing price
       of the Company's Common Stock for the 20 trading days prior to
       Termination.

              (b) Continued Benefits. For a eighteen (18) month period (or, if
       less, the number of months from the Date of Termination until the
       Executive would have reached age sixty-five (65)) after the Date of
       Termination, the Company shall provide the Executive with life insurance,
       health, disability and other welfare benefits ("Welfare Benefits")
       substantially similar in all respects to those which the Executive is
       receiving immediately prior to the Notice of Termination (without giving
       effect to any reduction in such benefits subsequent to the Potential
       Change in Control preceding the Change in Control or the Change in
       Control which reduction constitutes or may constitute Good Reason).
       Benefits otherwise receivable by an Executive pursuant to this Section
       shall be reduced to the extent substantially similar benefits are
       actually received by or made available to the Executive by any other
       employer during the same time period for which such benefits would be
       provided pursuant to this Section at a cost to the Executive that is
       commensurate with the cost incurred by the Executive immediately prior to
       the Executive's Date of Termination (without giving effect to any
       increase in costs paid by the Executive after the Potential Change in
       Control preceding the Change in Control or the Change in Control which
       constitutes or may constitute Good Reason); provided, however, that if
       the Executive becomes employed by a new employer which maintains a
       medical plan that either (i) does not cover the Executive or a family
       member or dependent with respect to a preexisting condition which was
       covered under the applicable Company medical plan, or (ii) does not cover
       the Executive or a family member or dependent for a designated waiting
       period, the Executive's coverage under the applicable Company medical
       plan shall continue (but shall be limited in the event of noncoverage due
       to a preexisting condition, to such preexisting condition) until the
       earlier of the end of the applicable period of noncoverage under the new
       employer's plan or the third anniversary of the Executive's Date of
       Termination. The Executive agrees to report to the Company any coverage
       and benefits actually received by the Executive or made available to the
       Executive from such other employer(s). The Executive shall be entitled to
       elect to change his level of coverage and/or his choice of 




                                       5
<PAGE>   6

       coverage options (such as Executive only or family medical coverage) with
       respect to the Welfare Benefits to be provided by the Company to the
       Executive to the same extent that actively employed senior executives of
       the Company are permitted to make such changes; provided, however, that
       in the event of any such changes the Executive shall pay the amount of
       any cost increase that would actually be paid by an actively employed
       executive of the Company by reason of making the same change in his level
       of coverage or coverage options.

              (c) Gross-Up Payment. In the event that the Executive becomes
       entitled to the Severance Benefits or any other benefits or payments
       under this Agreement (other than pursuant to this Section) by reason of
       the accelerated vesting of stock options thereunder (together, the "Total
       Benefits"), and in the event that any of the Total Benefits will be
       subject to the Excise Tax, the Company shall pay to the Executive an
       additional amount (the "Gross-Up Payment") such that the net amount
       retained by the Executive, after deduction of any Excise Tax on the Total
       Benefits and any federal, state and local income tax, Excise Tax and FICA
       and Medicare withholding taxes upon the payment provided for by this
       Section, shall be equal to the Total Benefits.

              For purposes of determining whether any of the Total Benefits will
       be subject to the Excise Tax and the amount of such Excise Tax, (i) any
       other payments or benefits received or to be received by the Executive in
       connection with a Change in Control or the Executive's termination of
       employment (whether pursuant to the terms of this Agreement or any other
       agreement, plan or arrangement with the Company, any Person whose actions
       result in a Change in Control or any Person affiliated with the Company
       or such Person) shall be treated as "parachute payments" within the
       meaning of Section 280G(b) (2) of the Code, and all "excess parachute
       payments" within the meaning of Section 280G(b) (1) shall be treated as
       subject to the Excise Tax, unless in the opinion of tax counsel ("Tax
       Counsel") selected by the Company's independent auditors and acceptable
       to the Executive, such other payments or benefits (in whole or in part)
       do not constitute parachute payments, or such excess parachute payments
       (in whole or in part) represent reasonable compensation for services
       actually rendered within the meaning of Section 280G(b) (4) of the Code
       in excess of the Base Amount, or are otherwise not subject to the Excise
       Tax, (ii) the amount of the Total Benefits which shall be treated as
       subject to the Excise Tax shall be equal to the lesser of (A) the total
       amount of the Total Benefits reduced by the amount of such Total Benefits
       that in the opinion of Tax Counsel are not parachute payments, or (B) the
       amount of excess parachute payments within the meaning of Section 280G(b)
       (1) (after applying clause (i), above), and (iii) the value of any
       non-cash benefits or any deferred payment or benefit shall be determined
       by the Company's independent auditors in accordance with the principles
       of sections 280G(d) (3) and (4) of the Code. For purposes of determining
       the amount of the Gross-Up Payment, the Executive shall be deemed to pay
       federal income taxes at the highest marginal rate of federal income
       taxation in the calendar year in which the Gross-Up Payment is to be made
       and state and local income taxes at the highest marginal rate of taxation
       in the state and locality of the Executive's residence on the Date of
       Termination, net of the reduction in federal income taxes which could be
       obtained from deduction of such state and local taxes (calculated by
       assuming that any reduction under Section 68 of the Code in the amount of
       itemized deductions allowable to the Executive applies first to reduce
       the amount of such state and local income taxes that would otherwise be
       deductible by the Executive).



                                       6
<PAGE>   7
              In the event that the Excise Tax is subsequently determined to be
       less than the amount taken into account hereunder at the time of
       termination of the Executive's employment, the Executive shall repay to
       the Company, at the time that the amount of such reduction in Excise Tax
       is finally determined, the portion of the Gross-Up Payment attributable
       to such reduction (plus that portion of the Gross-Up Payment attributable
       to the Excise Tax, federal, state and local income taxes and FICA and
       Medicare withholding taxes imposed on the portion of the Gross-Up Payment
       being repaid by the Executive to the extent that such repayment results
       in a reduction in Excise Tax, FICA and Medicare withholding taxes and/or
       federal, state or local income taxes) plus interest on the amount of such
       repayment at the rate provided in Section 1274(b) (2) (B) of the Code. In
       the event that the Excise Tax is determined to exceed the amount taken
       into account hereunder at the time of the termination of the Executive's
       employment (including by reason of any payment the existence or amount of
       which cannot be determined at the time of the Gross-Up Payment), the
       Company shall make an additional Gross-Up Payment, determined as
       previously described, to the Executive in respect of such excess (plus
       any interest, penalties or additions payable by the Executive with
       respect to such excess) at the time that the amount of such excess is
       finally determined.

              (D) Timing of Payments. The payments provided for in Sections 5(a)
       and 5(c) shall be made not later than the fifth (5th) day following the
       Date of Termination; provided, however, that if the amounts of such
       payments cannot be finally determined on or before such day, the Company
       shall pay to the Executive on such day an estimate, as determined in good
       faith by the Company, of the minimum amount of such payments and shall
       pay the remainder of such payments (together with interest at the rate
       provided in Section 1274(b) (2) (B) of the Code from the fifth (5th) day
       following the Date of Termination to the payment of such remainder) as
       soon as the amount thereof can be determined but in no event later than
       the thirtieth (30th) day after the Date of Termination. In the event that
       the amount of the estimated payments exceeds the amount subsequently
       determined to have been due, such excess shall constitute a loan by the
       Company to the Executive, payable on the fifth (5th) business day after
       demand by the Company (together with interest at the rate provided in
       Section 1274(b) (2) (B) of the Code from the fifth (5th) day following
       the Date of Termination to the repayment of such excess).

              6(D) Reimbursement of Legal Costs. The Company shall pay to the
       Executive all legal fees and expenses incurred by the Executive as a
       result of a termination which entitles the Executive to any payments
       under this Agreement including all such fees and expenses, if any,
       incurred in contesting or disputing any Notice of Intent to Terminate
       under Section 4.(a) hereof or in seeking to obtain or enforce any right
       or benefit provided by this Agreement or in connection with any tax audit
       or proceeding to the extent attributable to the application of Section
       4999 of the Code to any payment or benefit provide hereunder. Such
       payments shall be made within five (5) business days after delivery of
       the Executive's respective written requests for payment accompanied by
       such evidence of fees and expenses incurred as the Company reasonably may
       require.

              7. Damages. Executive shall not be required to mitigate damages
with respect to the amount of any payment provided under this Agreement by
seeking other employment or otherwise, nor shall the amount of any payment
provided under this Agreement be reduced by retirement benefits, deferred
compensation or any compensation earned by Executive as a result of employment
by another employer.



                                       7
<PAGE>   8
              8. Successor to Company. The Company shall require any successor
or assign (whether direct or indirect, by purchase, merger, consolidation or
otherwise) to all or substantially all of the business and/or assets of the
Company, by agreement in form and substance satisfactory to Executive,
expressly, absolutely and unconditionally to assume and agree to perform this
Agreement in the same manner and to the same extent that the Company would be
required to perform it if no such succession or assignment had taken place. As
used in this Agreement, "Company" shall mean the Company as hereinbefore defined
and any successor or assign to its business and/or assets as aforesaid which
executes and delivers the agreement provided for in this section or which
otherwise becomes bound by all the terms and provisions of this Agreement by
operation of law.

              9. Heirs of Executive. This Agreement shall inure to the benefit
of and be enforceable by Executive's personal and legal representatives,
executors, administrators, successors, heirs, distributes, devisees and
legatees. If Executive should die while any amounts are still payable to
Executive hereunder, all such amounts, unless otherwise provided herein, shall
be paid in accordance with the terms of this Agreement to Executive's devisee,
legatee, or other designee or, if there be so such designee, to Executive's
estate.

              10. Arbitration. Any dispute, controversy or claim arising under
or in connection with this Agreement, or the breach hereof, shall be settled
exclusively by arbitration in accordance with the Rules of the American
Arbitration Association then in effect. Judgment upon the award rendered by the
arbitrator(s) may be entered in any court of competent jurisdiction. Any
arbitration held pursuant to this section in connection with Executive's
termination of employment shall take place in Houston, Texas at the earliest
possible date. If any proceeding is necessary to enforce or interpret the terms
of this Agreement, or to recover damages for breach thereof, the prevailing
party shall be entitled to reasonable attorneys fees and necessary costs and
disbursements, not to exceed in the aggregate one percent (1%) of the net worth
of the other party, in addition to any other relief to which he or it may be
entitled.

              11. Notice. For purposes of this Agreement, notices and all other
communications provided for in this Agreement shall be in writing and shall be
deemed to have been duly given when delivered by messenger or in person, or when
mailed by United States registered mail, return receipt requested, postage
prepaid, as follows:

              If to the Company:      Texas Biotechnology Corporation
                                      7000 Fannin, Suite 1920
                                      Houston, Texas  77030
                                      Attention:  President

              If to the Executive:    John McMurdo, M.D.
                                      c/o Texas Biotechnology Corporation
                                      7000 Fannin, Suite 1920
                                      Houston, Texas  77030

or such other address as either party may have furnished to the other in writing
in accordance herewith, except that notices of change of address shall be
effective only upon receipt.



                                       8
<PAGE>   9


       12.    General Provisions.

              (a) Executive's rights and obligations under this Agreement shall
not be transferable by assignment or otherwise, nor shall Executive's rights be
subject to encumbrance or subject to the claims of the Company's creditors.
Nothing in this Agreement shall prevent the consolidation of the Company with,
or its merger into, any other corporation, or the sale by the Company of all or
substantially all of its properties or assets; and this Agreement shall inure to
the benefit of, be binding upon and be enforceable by, any successor surviving
or resulting corporation, or other entity to which such assets shall be
transferred. This Agreement shall not be terminated by the voluntary or
involuntary dissolution of the Company.

              (b) This Agreement and any Employment Agreement with Executive
plus terms of any stock option plans or grants constitutes the entire agreement
between the parties hereto in respect to the rights and obligations of the
parties following a Change in Control. This Agreement supersedes and replaces
all prior oral and written agreements, understandings, commitments, and
practices between the parties (whether or not fully performed by Executive prior
to the date hereof), which shall be of no further force or effect.

              (c) The provisions of this Agreement shall be regarded as
divisible, and if any of said provisions or any part thereof are declared
invalid or unenforceable by a court of competent jurisdiction, the validity and
enforceability of the remainder of such provisions or parts thereof and the
applicability thereof shall not be affected thereby.

              (d) This Agreement may not be amended or modified except by a
written instrument executed by the Company and Executive.

              (e) This Agreement and the rights and obligations hereunder shall
be governed by and construed in accordance with the laws of the State of Texas.

              IN WITNESS WHEREOF, the parties have executed this Agreement as of
the date first above written.

                                                 TEXAS BIOTECHNOLOGY CORPORATION
                                                 A Delaware Corporation

                                              By /s/ DAVID B. MCWILLIAMS
                                                 ------------------------------
   Attest:                                       David B. McWilliams
                                                 President and CEO
By  /s/ STEPHEN L. MUELLER
   --------------------------------------

   By the authority of the Compensation
   Committee of the Board of Directors
   of Texas Biotechnology Corporation
   on March 23, 1999.

                                                 /s/ JOHN MCMURDO
                                                 ------------------------------
                                                                 Executive



                                       9

<PAGE>   1

                                                                   EXHIBIT 10.66

           [TEXAS BIOTECHNOLOGY CORPORATION LETTERHEAD]

June 1, 1993


Mr. Joseph M. Welch
304 Sharpless Street
West Chester, PA 19382



Dear Joe:

I am pleased to extend to you the offer to join Texas Biotechnology Corporation
as Vice President, Business Development. This offer is effective on the date the
Board of Directors of Texas Biotechnology Corporation approves a new financing.
I think you will add a new and valuable dimension to our management team and
will contribute significantly toward the development of Texas Biotechnology in
the future.

The following confirms my offer discussed with you over the telephone:


     o    $125,000 per annum salary to be reviewed annually

     o    An incentive equal to 25% of your earned salary. The actual amount of
          the incentive will be based on your and the Company's performance
          versus approved goals. This incentive may be paid in cash or incentive
          stock options at the discretion of the Board of Directors.

     o    Life insurance benefits of one times your annual salary as provided by
          the Company. You will also be eligible to participate in the Company's
          401(k) retirement program.

     o    Vacation of four weeks per year


     o    Stock Options in the amount of 175,000 shares at an exercise price
          $.50 per share, as determined by the Board of Directors, exercisable
          in three (3) annual equal amounts under the Company's 1990 Incentive
          Stock Option Plan.


     o    Six months salary continuation in the event your employment is
          terminated by the company other than for voluntary or "just
          cause" reasons.


     o    Reasonable relocation expenses related to your move to the Houston
          area, which should be as soon as practical. Included in the
          relocation, the company will cover commission on the sale of your
          house, packing and the shipping of your household goods, temporary
          living as appropriate, and approved closing costs, if any, on the
          purchase of a new residence. All relocation expenses will be grossed
          up.    

 






<PAGE>   2
                                                            Mr. Joseph M. Welch
                                                                   June 1, 1993
                                                                       Page -2-


          I am delighted to welcome you to Texas Biotechnolody Corporation. I
          look forward to a close, professional, and personal relationship and
          to the ultimate success of the Company.

          Sincerly yours,

          /s/ DAVID B. McWILLIAMS
          David B. McWilliams 
          President and Chief Executive Officer

          DBM/kdc

Texas Biotechnology

Corporation

          AGREED AND ACCEPTED THIS 17 DAY OF JUNE, 1993

          /s/ JOSEPH M. WELCH
          -----------------------------
          Joseph M. Welch

<PAGE>   1
                                                                   EXHIBIT 10.67

                      FIRST AMENDMENT TO WARRANT AGREEMENT


         This FIRST AMENDMENT TO WARRANT AGREEMENT (the "Amendment"), dated as
of November 12, 1998, is entered into by and between Texas Biotechnology
Corporation, a Delaware corporation (the "Company") and The Bank of New York, a
corporation organized under the banking laws of the State of New York (the
"Warrant Agent").

                                   WITNESSETH


         WHEREAS, the Company and the Warrant agent are parties to the Warrant
Agreement dated as of December 15, 1993, (the "Warrant Agreement"), pursuant to
which the Warrant Agent acts on behalf of the Company in connection with the
issuance, transfer, exchange, replacement, redemption and surrender of the
certificates for the Company's Redeemable Common Stock Purchase Warrants (the
"Warrants");

         WHEREAS, the Company has requested and the Warrant Agent agrees to
certain amendments to the Warrant Agreement; and

         WHEREAS, the Warrant Agent is willing to amend the Warrant Agreement,
subject to the terms and conditions of this Amendment.

         NOW THEREFORE, in consideration of the premises and other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties agree as follows:

         1. Defined Terms. Unless otherwise defined herein capitalized terms
used herein shall have the meanings, if any, assigned to them in the Warrant
Agreement.

         2. Amendment to Warrant Agreement.

         Section 2.2 of the Warrant Agreement is hereby amended and restated in
its entirety to read as follows:

                  "2.2 Registration of Common Stock and Exercisability of
         Warrants. Each Warrant may be exercised at any time on or after
         December 15, 1993, the effective date of the Offering, as long as the
         effectiveness of the registration of the Warrant Shares is maintained
         under the Securities Act of 1933, as amended (the "Securities Act"),
         but not after 5:00 P.M., New York City time, on the earlier of
         September 30, 1999, or the business day immediately preceding the Call
         Date (as defined in Section 4.11). The term "Exercise Deadline" as used
         in this Agreement shall mean the latest 






<PAGE>   2

         time and date at which the Warrants may be exercised. The Company shall
         use its best efforts to maintain the registration or qualification in
         effect of the Warrant Shares and to keep available for delivery upon
         the exercise of the Warrants a prospectus that meet the requirements of
         Section 10 of the Securities Act, until the earlier of the date by
         which all Warrants are exercised or the Exercise Deadline; provided,
         however, that the Company shall have no obligation hereunder to
         maintain the effectiveness of such registration or qualification ro
         keep available a prospectus, as aforesaid, in the event that, by
         amendment to the Securities Act or otherwise, such registration or
         qualification or the delivery of such prospectus is not required at the
         said Common Stock is to be issued; and provided further, that in the
         event, by amendment to the Securities Act or otherwise, some other or
         different requirement shall be imposed by act of the Congress of the
         United States which shall related to the issuance of Common Stock upon
         exercise of the Warrants, the Company shall use its best efforts to
         comply with such requirements."

         3. Representations and Warranties. The Company hereby represents and
warrants to the Warrant Agent as follows:

                  The execution, delivery and performance by the Company of this
         Amendment has been duly authorized by all necessary corporate and other
         action and does not, and will not, require any registration, with
         consent or approval of, notice to or action by, any person or entity
         (including any governmental authority or entity) in order to be
         effective and enforceable. The Warrant Agreement, including such
         provisions that have been amended by this Amendment, constitute the
         legal, valid and binding obligations of the Company.

         4. Effective Date. This amendment will become effective as of November
12, 1998 (the "Effective Date"); provided that each of the following conditions
precedent is satisfied:

         (a) The Company has executed and delivered this Amendment; and

         (b) All representations and warranties contained herein are true and
         correct as of the Effective Date.

         5.  Miscellaneous.

         (a) Except as expressly amended or waived herein, all terms, covenants
         and provisions of the Warrant Agreement and the other documents
         executed in connection thereto are and shall remain in full force and
         effect.

         (b) This Amendment shall be binding upon and inure to the benefit of
         the parties hereto and their respective successors and assigns.




                                       2
<PAGE>   3

         (c) This Amendment may be executed in one or more counterparts, each of
         which shall be deemed an original, but all of which together shall
         constitute one and the same instrument.

         (d) This Amendment, together with the Warrant Agreement and the other
         documents executed in connection thereto, embodies the final, entire
         agreement among the parties hereto and supersedes any and all prior
         commitments or agreements in connection with the subject matter
         thereof, representations and understandings, whether written or oral,
         relating to the subject matter hereof and may not be contradicted or
         varied by evidence of prior, contemporaneous, or subsequent oral
         agreements or discussions of the parties hereto. There are no unwritten
         oral agreements among the parties hereto.


         IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Amendment as of the date first above written.

                                        TEXAS BIOTECHNOLOGY CORPORATION


                                        By: /s/  STEPHEN L. MUELLER
                                           -----------------------------------

                                        Name: Stephen L. Mueller           
                                             ---------------------------------

                                        Title: Vice President, Finance     
                                              --------------------------------
                                                 and Administration
                                                 Secretary and Treasurer



                                        THE BANK OF NEW YORK



                                        By: /s/  JAMES DIMINO              
                                           -----------------------------------

                                        Name: James Dimino
                                             ---------------------------------

                                        Title: Assistant Vice President    
                                              --------------------------------


                                       3

<PAGE>   1


                                                                    EXHIBIT 23-1



                          INDEPENDENT AUDITORS' CONSENT




The Board of Directors
Texas Biotechnology Corporation:

We consent to incorporated by reference in the registration statement (Nos.
33-79656, 33-79658, 33-79670, 33-93282, 33-93368, 333-27423 and 333-27425) on
Form S-8 and (Nos. 33-70994, 333-03433 and 333-25043) on Form S-3 of Texas
Biotechnology Corporation of our report dated February 12, 1999, related to the
consolidated balance sheets of Texas Biotechnology Corporation and subsidiary as
of December 31, 1998 and 1997, and the related consolidated statements of
operations, stockholders' equity, and cash flows for each of the years in the
three-year period ended December 31, 1998 which report appears in the December
31, 1998, annual report on Form 10-K of Texas Biotechnology Corporation .

                                                     /S/ KPMG LLP
                                                     --------------------------
                                                     KPMG LLP


March 29, 1999

<TABLE> <S> <C>

<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<CASH>                                       4,176,911
<SECURITIES>                                26,199,091
<RECEIVABLES>                                1,426,959
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                            32,776,951
<PP&E>                                       9,120,621
<DEPRECIATION>                               5,851,183
<TOTAL-ASSETS>                              36,105,980
<CURRENT-LIABILITIES>                        2,869,760
<BONDS>                                              0
                                0
                                          0
<COMMON>                                       170,640
<OTHER-SE>                                  33,065,580
<TOTAL-LIABILITY-AND-EQUITY>                36,105,980
<SALES>                                              0
<TOTAL-REVENUES>                             2,251,681
<CGS>                                                0
<TOTAL-COSTS>                               18,853,560
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                           (14,514,172)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
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<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                              (14,514,172)
<EPS-PRIMARY>                                   (0.43)
<EPS-DILUTED>                                        0
        

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