TEXAS BIOTECHNOLOGY CORP /DE/
424B3, 2000-01-21
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>   1


                                                               Filed Pursuant to
                                                                  Rule 424(b)(3)
                                                      Registration Statement No.
                                                                       033-70994
PROSPECTUS
                         TEXAS BIOTECHNOLOGY CORPORATION

                                3,995,394 SHARES
                                  COMMON STOCK

     This Prospectus relates to an offering (the "Offering") of 3,995,394 shares
(the "Shares") of common stock, par value $.005 per share (the "Common Stock"),
of Texas Biotechnology Corporation ("TBC" or "Company"). The Shares are
issuable to holders of outstanding warrants to purchase shares of the Common
Stock. The Shares are issuable upon exercise of outstanding, publicly traded
redeemable warrants (the "Warrants") issued as part of a unit sold (the "Units")
in conjunction with the Company's initial public offering in 1993 (the "IPO").
The Warrants are currently exercisable at $8.44 per share and expire December
31, 2000. 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 140% of the exercise price 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 shares of Common Stock and Warrants are listed and traded on the AMEX
under the symbol "TXB" and "TXB.WS," respectively. On January 7, 2000, the last
reported sale prices of the Common Stock and Warrants were $8.375 per share and
$2.125 per Warrant.

     SEE "RISK FACTORS" ON PAGES 4-10 FOR A DISCUSSION OF CERTAIN FACTORS THAT
SHOULD BE CONSIDERED BY PROSPECTIVE INVESTORS.

     THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED
UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
CONTRARY IS A CRIMINAL OFFENSE.


<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------
                                       PROCEEDS TO         PRICE TO
UNDERWRITING  DISCOUNTS                COMPANY (2)        PUBLIC (1)          COMMISSIONS
- -----------------------------------------------------------------------------------------
<S>                                    <C>                     <C>            <C>
Per Warrant.....................       $      8.44             -              $      8.44
- -----------------------------------------------------------------------------------------
Total...........................       $33,721,125             -              $33,721,125
- -----------------------------------------------------------------------------------------
</TABLE>

- ------------------
(1)  Subject to adjustment in certain circumstances as set forth in the Warrant
     Agreement, as amended, relating to the Warrants (the"Warrant Agreement").

(2)  The Company may engage broker-dealers to solicit exercises of the Warrants.
     See "Plan of Distribution."

                 The date of this Prospectus is January 17, 2000



<PAGE>   2


                              AVAILABLE INFORMATION

     The Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance
therewith, files reports, proxy statements and other information with the
Securities and Exchange Commission (the "Commission"). Such reports, proxy
statements and other information can be inspected and copied at the Public
Reference Room of the Commission at 450 Fifth Street, N.W., Washington, D.C.
20549 and at the Commission's regional offices at 500 West Madison Street, Suite
1400, Chicago, Illinois 60661-2511 and Seven World Trade Center, Suite 1300, New
York, 10048. Information on the operation of the Public Reference Room may be
obtained by calling the Commission at 1-800-SEC-0330. Such materials also can be
inspected at the offices of the AMEX, 86 Trinity Place, New York, New York
10006, on which the Common Stock and Warrants are listed and traded. In
addition, the Commission maintains an Internet site at http://www.sec.gov that
contains reports, proxy and information statements, and other information
regarding registrants that file electronically with the Commission. TBC
maintains an Internet site at http://www.tbc.com that contains information
regarding the Company's business.

     The Company has filed with the Commission a registration statement on Form
S-3 (including any amendments thereto, the "Registration Statement") under the
Securities Act of 1933, as amended (the "Securities Act"), with respect to the
shares of Common Stock offered hereby. This Prospectus does not contain all of
the information set forth in the Registration Statement and the exhibits and
schedules thereto. For further information with respect to the Company and the
Common Stock, reference is made to the Registration Statement and the exhibits
and schedules thereto. Statements made in this Prospectus regarding the contents
of any contract or document filed as an exhibit to the Registration Statement
are not necessarily complete and, in each instance, reference is hereby made to
the copy of such contract or document so filed. Each such statement is qualified
in its entirety by such reference.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The following documents are hereby incorporated by reference in this
Prospectus:

(1)  The Company's Annual Report on Form 10-K, as amended, for the fiscal year
     ended December 31, 1998.

(2)  The Company's Quarterly Report on Form 10-Q for the quarter ended March 31,
     1999.

(3)  The Company's Quarterly Report on Form 10-Q for the quarter ended June 30,
     1999.

(4)  The Company's Current Reports on Form 8-K filed with the Commission on
     August 26, 1999 and September 14, 1999.

(5)  The Company's Quarterly Report on Form 10-Q for the quarter ended September
     30, 1999.

(6)  A description of the Company's Common Stock contained in the Company's
     Registration Statement on Form 8-A effective December 15, 1993 (Commission
     File No. 1-12574), as amended by the Company's proxy materials dated April
     22, 1994 and April 4, 1996, relating to its 1994 and 1996 annual
     shareholders' meetings, respectively.

     All documents filed by the Company pursuant to Sections 13(a), 13(c), 14 or
15(d) of the Exchange Act after the date of this Prospectus and before the
termination of the Offering covered hereby will be deemed to be incorporated by
reference in this Prospectus and to be a part hereof from the date of filing
such documents. Any statement contained herein, or in a document incorporated or
deemed to be incorporated by reference herein shall be deemed to be modified or
superseded for purposes of this Prospectus to the extent that a statement
contained herein or in any subsequently filed document which also is or is
deemed to be incorporated by reference herein, modified or superseded such
statement. Any such statement so modified or superseded shall not be deemed,
except as so modified or superseded, to constitute a part of this Prospectus.

                                        2

<PAGE>   3


     The Company will provide, without charge and on oral or written request, to
each person to whom this Prospectus is delivered, a copy of any or all of the
documents incorporated by reference in this Prospectus other than exhibits to
such documents, unless such exhibits are specifically incorporated by reference
into the information that this Prospectus incorporates. In addition, a copy of
the Company's most recent annual report to stockholders will be promptly
furnished, without charge and on oral or written request, to such persons. All
such requests should be directed to Texas Biotechnology Corporation, 7000
Fannin, 20th Floor, Houston, Texas 77030, Attention: Stephen L. Mueller, vice
president, finance and administration, secretary and treasurer (telephone (713)
796-8822).

                                   THE COMPANY

     TBC is a biopharmaceutical company engaged in discovering, developing and
commercializing synthetic small-molecule drugs primarily for cardiovascular
indications. TBC's research philosophy is based upon combining its expertise in
vascular biology with its advanced computational chemistry capabilities to
identify and develop small-molecule 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 filed and amended a new drug application ("NDA") with the United States
("U.S.") Food and Drug Administration (the "FDA") for its lead product
candidate, NOVASTAN(R) (argatroban) for use as an anticoagulant in patients with
heparin-induced thrombocytopenia ("HIT") syndrome. The Company has started
clinical studies in pulmonary arterial hypertension ("PAH") for TBC 11251 (TBC's
lead compound for vasospasm/hypertension) and completed the first of its planned
Phase II clinical trials for TBC 1269 (TBC's lead compound for vascular
inflammation) in allergic asthma. 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) and has entered
into a collaboration with LG Chemical, Ltd. ("LG Chemical") regarding other TBC
compounds.

     On September 10, 1999, the Company announced an extension of the exercise
period of the Warrants from September 30, 1999, to December 31, 2000.

     The Company's principal executive offices are located at 7000 Fannin
Street, 20th Floor, Houston, Texas 77030, and its telephone number is (713)
796-8822. References to TBC or the Company include its subsidiary,
ImmunoPharmaceutics, Inc., unless otherwise indicated.

                                        3

<PAGE>   4


                                  RISK FACTORS

     In evaluating the Company and its business, prospective investors should
carefully consider all of the information set forth in this Prospectus and the
documents incorporated herein by reference and should give particular attention
to the following risk factors.

NO ASSURANCE OF REGULATORY APPROVAL; NEED FOR EXTENSIVE CLINICAL TRIALS

     The production and marketing of the Company's products, as well as its
ongoing research and development activities, are subject to regulation by
governmental agencies in the U.S. and other countries. Any drug developed by the
Company will be subject to rigorous preclinical and clinical testing and
approval pursuant to regulations administered by the FDA, comparable agencies in
other countries and, to a lesser extent, by state regulatory authorities. This
approval process is likely to take several years and will involve significant
expenditures.

     For example, the original NDA for NOVASTAN(R) 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). Based on
consultation with representatives from the FDA, TBC collected and analyzed a
new, more comparable historical control group as the basis for demonstrating
NOVASTAN(R)'s safety and efficacy. The Company amended its NDA with the FDA for
NOVASTAN(R) (argatroban) as an anticoagulant for use in patients with HIT
syndrome on August 16, 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. The failure to receive timely NDA approval from the FDA will have a
material adverse effect on the commercialization of NOVASTAN(R) for HIT
syndrome, as well as potentially adversely impacting commercialization of other
clinical indications and the Company's liquidity.

     The cost to the Company of conducting human clinical trials for any
potential product can vary dramatically based on a number of factors, including
the order and timing of clinical indications pursued and the extent of
development and financial support, if any, from corporate partners. Because of
the intense competition in the cardiovascular market, the Company may have
difficulty obtaining sufficient patient populations or clinician support to
conduct the necessary clinical trials as planned and may have to expend
substantial additional funds to obtain access to such resources, or delay or
modify its plans significantly. There is no assurance that the Company will have
sufficient resources to complete the required regulatory review process or that
the Company could survive the inability to obtain, or further delays in
obtaining, such approvals. There can be no assurance that clinical testing of
the Company's products will provide evidence of safety and efficacy in humans,
that regulatory approvals will be granted for any of the Company's products or
that it will be economically feasible to commercialize any products for which
regulatory approvals are granted. Approvals that may be granted will be subject
to continual review, and later discovery of previously unknown problems may
result in restrictions on a product's future use or withdrawal of the product
from the market. Substantial changes in regulatory and reimbursement policy may
affect the Company's research and development expenditures and regulatory
approval of the Company's product candidates.

DEPENDENCE ON STRATEGIC RELATIONSHIPS

     The Company will rely on strategic relationships with corporate partners to
provide the financing, marketing and technical support and, in certain cases,
the technology necessary to develop and commercialize certain of its product
candidates. TBC has entered into an agreement with Mitsubishi to license
Mitsubishi's rights and technology relating to NOVASTAN(R) (the "Mitsubishi
Agreement") in the U.S. and Canada for specified indications. 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 the first commercial sale of products in
a particular country. 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.

                                        4

<PAGE>   5


     In August 1997, the Company and SmithKline entered into a collaboration
regarding the commercialization and development of NOVASTAN(R) (the "SmithKline
Agreement"). Under the SmithKline Agreement, the Company granted an exclusive
sublicense to SmithKline relating to the continued development and
commercialization of NOVASTAN(R). The SmithKline Agreement provides for the
payment of royalties and certain milestone payments upon the completion of
various regulatory filings and receipt of regulatory approvals. TBC will retain
the rights to any NOVASTAN(R) 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. 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 indication 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.

     In October 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 in
certain territories. LG Chemical has committed to make research payments and has
the right to terminate future research payments if TBC fails to meet certain
milestones to be established by the parties in accordance with the agreement.

     The Company's success will depend on these and any future strategic
alliances. There can be no assurance that the Company will satisfy the
conditions required to obtain additional milestone payments under the existing
agreements or to prevent these agreements from being terminated, some of which
conditions will not be within the control of the Company. There can be no
assurance that the Company will be able to enter into future strategic alliances
on acceptable terms. The termination of any existing strategic alliances or the
inability to establish additional collaborative arrangements may limit the
Company's ability to develop its technology and may have a material adverse
effect on the Company's business or financial condition.

DEVELOPMENT AND TECHNOLOGICAL UNCERTAINTY

     The Company has not produced or marketed any material products and,
accordingly, has not begun to generate revenues from the commercialization of
its product candidates. To date, the Company's resources have been dedicated to
the research and development of small-molecule drugs for certain vascular and
other indications. The Company has developed lead compounds in its
vasospasm/hypertension, vascular inflammation and vascular proliferative disease
programs. The commercial applications of the Company's product candidates will
require further investment, research, development, preclinical and clinical
testing and regulatory approvals, both foreign and domestic. There can be no
assurance that the Company will be able to develop, produce at reasonable cost,
or market successfully, any of its product candidates. Further, these product
candidates may prove to have undesirable and unintended side effects and, in
some cases, may require complex delivery systems that may prevent or limit their
commercial use. All of the Company's products will require regulatory approval
before they may be commercialized. Products, if any, resulting from the
Company's research and development programs are not expected to be commercially
available for a number of years, and there can be no assurance that any
successfully developed products will generate substantial revenues or that the
Company will ever be profitable.

NEED FOR ADDITIONAL FUNDS; HISTORY OF OPERATING LOSSES

     Because the Company has been unprofitable to date and expects to incur
losses for the next several years as the Company invests in product research and
development, preclinical and clinical testing and regulatory compliance, the
Company will require substantial additional funds to complete the research and
development of its product candidates, to establish commercial scale
manufacturing facilities and to market its products. The Company has accumulated
approximately $96.0 million in net losses through September 30, 1999. The
Company anticipates that operating expenses may increase during 2000 and
subsequent years. The Company began to incur costs to develop NOVASTAN(R) during
the third quarter of 1993. The Company also began incurring clinical trial costs
in 1997 for

                                        5

<PAGE>   6


the compounds TBC11251 and TBC1269 and is continuing its clinical trials for
these compounds during 2000. In 2000, 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 fourth 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 Warrants, if any, which expire on December 31, 2000, and the timing and
terms of future corporate collaterations, 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.

     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 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.

TECHNOLOGICAL CHANGE AND COMPETITION

     The biopharmaceutical industry is undergoing rapid and significant
technological change and is highly competitive. The Company's success will
depend on its ability to develop and apply its technology and on its ability to
establish and maintain a market for its products. Potential competitors in the
U.S. and other countries include major pharmaceutical and chemical companies,
specialized biotechnology firms, universities and other research institutions,
many of which have substantially greater financial, technical, manufacturing and
marketing capabilities than the Company. Competitors may develop products or
other novel technologies that are more effective than any that have been or are
being developed by the Company or may obtain FDA approval for products more
rapidly than the Company. There can be no assurance that technological
development by others will not render the Company uncompetitive or that the
Company will be successful in establishing or maintaining its technological
competitiveness.

DEPENDENCE ON QUALIFIED PERSONNEL

     The Company's success is highly dependent on its ability to attract and
retain qualified scientific and management personnel. The loss of the services
of the principal members of the Company's management and scientific staff may
impede the Company's ability to commercialize its products. In order to
commercialize its products, the Company must maintain and 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

                                        6

<PAGE>   7


Company will be successful in hiring or retaining qualified personnel. Managing
the integration of new personnel and company growth in general could pose
significant risks to the Company's development and progress.

     The continued employment of David B. McWilliams, president and chief
executive officer, and Richard A. F. Dixon, Ph.D., vice president of research,
is key to the Company's success. Each of these employees has an employment
agreement with the Company. Mr. McWilliams' and Dr. Dixon's agreements are
effective through July 15, 1999 and provide for continuing one-year extensions.

     The Company relies on consultants and advisors, including its scientific
advisors, to 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.

DEPENDENCE ON SUPPLIER

     At present, Mitsubishi is the only manufacturer of NOVASTAN(R). In
connection with the SmithKline Agreement, Mitsubishi entered into a Supply
Agreement ("Mitsubishi Supply Agreement") with SmithKline, whereby Mitsubishi
will manufacture and 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. However, in the event Mitsubishi terminates
manufacturing NOVASTAN(R) or defaults in its supply commitment, there can be no
assurance that SmithKline will be able to commence manufacturing of NOVASTAN(R)
in a timely manner or that alternate sources of bulk NOVASTAN(R) will be
available at reasonable cost, or at all. 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.

UNCERTAINTY REGARDING PATENTS AND PROPRIETARY INFORMATION

     The Company actively seeks patent protection for its proprietary
technology, both in the U.S. and abroad. The Company's success will depend, in
part, on its ability to obtain patents and to operate without infringing on the
proprietary rights of others. There can be no assurance that patents issued to
or licensed by the Company will not be challenged, invalidated or circumvented,
or that the rights granted thereunder will provide competitive advantages to the
Company. There can be no assurance that the Company's pending patent
applications or patent applications in preparation presently or in the future,
if and when issued, will be valid and enforceable and withstand litigation.
There can be no assurance that others will not independently develop
substantially equivalent or superseding proprietary technology or that an
equivalent product will not be marketed in competition with the Company's
products, thereby substantially reducing the value of the Company's proprietary
rights. There is a substantial backlog of pharmaceutical and biotechnology
patent applications at the U.S. Patent and Trademark Office ("PTO"). Because
patent applications in the U.S. are maintained in secrecy until patents issue,
and because publication of discoveries in the scientific or patent literature
tends to lag behind actual discoveries by several months, there can be no
assurance that the Company will obtain patent protection for its inventions. In
addition, patent protection, even if obtained, is affected by the limited period
of time for which a patent is effective. Furthermore, patent positions of
pharmaceutical and biotechnology companies, as well as those of academic and
research institutions, are highly uncertain and involve complex legal and
factual questions. This is an uncertain and developing area of the law that is
potentially subject to significant change. Therefore, the scope or
enforceability of claims allowed in the patents on which the Company will rely
cannot be predicted with any certainty.

     The Company also relies on trade secrets, know-how and continuing
technological advancement to maintain its competitive position. Although the
Company has entered into confidentiality agreements with its employees and
consultants, which contain assignment of invention provisions, no assurance can
be given that others will not gain access to these trade secrets, that such
agreements will be honored or that the Company will be able to effectively
protect its rights to its unpatented trade secrets. Moreover, 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.

                                        7

<PAGE>   8


     In addition to protecting its proprietary technology and trade secrets, the
Company may be required to obtain licenses to patents or other proprietary
rights from third parties. No assurance can be given that any licenses required
under any patents or proprietary rights would be made available on acceptable
terms, if at all. If the Company does not obtain required licenses, it could
encounter delays in product introductions while it attempts to design around
blocking patents, or it could find that the development, manufacture or sale of
products requiring such licenses could be foreclosed.

     The Company could incur substantial costs in defending any patent
infringement suits or in asserting any patent rights, including those granted by
third parties, in a suit with another party. The PTO could institute
interference proceedings involving the Company in connection with one or more of
the Company's patents or patent applications, and such proceedings could result
in an adverse decision as to priority of invention. TBC has one interference
proceeding pending which involves compounds not currently of commercial interest
to TBC. The PTO or a comparable agency of a foreign jurisdiction could also
institute re-examination or opposition proceedings against the Company in
connection with one or more of the Company's patents or patent applications and
such proceedings could result in an adverse decision as to the validity or scope
of the patents.

POSSIBLE VOLATILITY OF STOCK PRICE; TRADING MARKET FOR COMMON STOCK

     The stock market has from time to time experienced significant price and
volume fluctuations that may be unrelated to the operating performance of
particular companies. In particular, the market price of the Company's
securities, like that of the securities of other biopharmaceutical companies,
may be highly volatile. Factors such as announcements by the Company or its
competitors concerning technological innovations, new commercial products or
procedures by the Company or its competitors, proposed governmental regulations
and developments in both the U.S. and foreign countries, disputes relating to
patents or proprietary rights, publicity regarding actual or potential medical
results relating to products under development by the Company or its
competitors, public concern as to the safety of biotechnology products, and
economic and other external factors, as well as period-to-period fluctuations
and financial results, may have a significant effect on the market price of the
Company's securities.

     From time to time, there has been limited trading volume with respect to
the Common Stock. In addition, there can be no assurance that there will
continue to be a trading market or that any analysts will continue to provide
research coverage with respect to the Common Stock. Accordingly, with respect to
the Common Stock being offered hereby, no assurances can be made that such
factors will not affect the market for the Common Stock.

NO MANUFACTURING, MARKETING OR SALES ACTIVITIES

     The Company has no manufacturing, marketing or product sales experience. If
the Company develops any commercially marketable products, there can be no
assurance that contract manufacturing services will be available in sufficient
capacity to supply the Company's product needs on a timely basis. If the Company
decides to build or acquire commercial scale manufacturing capabilities, the
Company will require additional management and technical personnel and
additional capital. No assurance can be given that the raw materials necessary
for the manufacture of the Company's products will be available in sufficient
quantities or at a reasonable cost. Complications or delays in obtaining raw
materials or in product manufacturing could delay the submission of products for
regulatory approval and the initiation of new development programs, each of
which could materially impair the Company's competitive position and potential
profitability. There can be no assurance that the Company will be able to enter
into any other supply arrangements on acceptable terms, if at all. If at some
point in the future, the Company decides to perform its own sales and marketing
activities, the Company will require additional management, will need to hire
sales and marketing personnel and will require additional capital. No assurance
can be given that qualified personnel will be available in adequate numbers or
at a reasonable cost and there can be no assurance that the Company's sales
staff will achieve success in its marketing efforts.

                                        8

<PAGE>   9


PRODUCT LIABILITY EXPOSURE

     Product liability risk is inherent in the testing, manufacture, marketing
and sale of the Company's products, and there can be no assurance that the
Company will be able to avoid significant product liability exposure. Product
liability insurance for the pharmaceutical industry, when available, is
expensive. The Company has obtained $2.0 million of product liability insurance
to cover its clinical trial programs. Pursuant to the Mitsubishi Agreement and
the SmithKline Agreement, the Company is obligated to acquire additional
coverage as the Company develops products. Existing coverage will not be
adequate as the Company further develops products and there can be no assurance
that adequate insurance coverage will be available at a reasonable cost in the
future. A future product liability claim may have a material adverse effect on
the business or financial condition of the Company.

UNCERTAINTY OF PHARMACEUTICAL PRICING AND RELATED MATTERS; NEED FOR
REIMBURSEMENT

     The future revenues and profitability of, and availability of capital for,
biotechnology companies may be affected by the continuing efforts of
governmental and third-party payers to contain or reduce the costs of health
care through various means. For example, in certain foreign markets, the pricing
and profitability of prescription pharmaceuticals is subject to government
control. There have been, and there may continue to be, a number of federal and
state proposals to implement similar government control in the U.S. It is
uncertain what form any health care reform legislation may take or what actions
the federal, state and private payers may take in response to the suggested
reforms. The Company cannot predict when any reforms will be implemented, if
ever, or the effect of any implemented reform on the Company's business. There
can be no assurance that any implemented reform will not have a material adverse
effect on the Company's future results of operations. The Company's long-term
ability to market its products successfully may depend in part on the extent to
which reimbursement for the cost of such products and related treatment will be
available from public and private health insurers and other organizations.
Third-party payers are increasingly challenging the prices of medical products
and services. The reimbursement status of newly-approved health care products
is highly uncertain, and there can be no assurance that third-party coverage
will be available or that available third-party coverage will enable the Company
to maintain price levels sufficient to realize an appropriate return on its
investment in product development.

SHARES ELIGIBLE FOR FUTURE SALE; REGISTRATION RIGHTS

     As of December 31, 1999, substantially all of the Company's shares of
Common Stock were eligible for immediate sale in the public market. Moreover,
the resale of approximately 2.5 million outstanding shares are covered by
currently effective Form S-3 registration statements. The Company granted
registration rights to SmithKline for the 176,992 shares of Common Stock issued
pursuant to the SmithKline Agreement. The Company also granted registration
rights to Genentech, Inc. ("Genentech"), a former licensor of NOVASTAN(R) for
the 214,286 shares of Common Stock issued after acceptance of the NOVASTAN(R)
NDA filing.

     As part of the Company's IPO, Warrants covering approximately 4.1 million
shares of Common Stock were issued. Warrants covering 3,995,394 shares remain
outstanding and the shares of Common Stock issuable upon exercise are registered
for resale under this Registration Statement. Furthermore, the resale of an
aggregate of 148,036 shares issuable upon exercise of other warrants (with
exercise prices from $4.40 to $4.58 per share) are registered on currently
effective Form S-3 registration statements. Other warrants exercisable for
441,077 shares (with exercise prices ranging from $3.66 to $4.25 per share) are
not currently registered for resale, but have piggyback registration rights.
Approximately 3.2 million shares of Common Stock are issuable upon exercise of
outstanding employee stock options, will become eligible for sale in the public
markets at prescribed times in the future, and are registered under Form S-8
registration statements. As of December 31, 1999, such options were exercisable
to purchase approximately 2.3 million shares of Common Stock. TBC has agreed to
issue to Genentech an additional 71,429 shares of Common Stock within ten days
after the FDA's first approval of an NDA for NOVASTAN(R). The Company has also
granted Genentech a warrant to purchase an additional 142,858 shares of Common
Stock at an exercise price of $14.00 per share, subject to adjustment. The
Company has granted Genentech registration rights for all of these 214,287
shares issuable to Genentech. In total, as of December 31, 1999, the Company has
reserved approximately 8.1 million shares of Common Stock for issuance pursuant
to outstanding options, warrants and other contingent agreements.

                                        9

<PAGE>   10


Approximately 7.4 million of these shares of reserved Common Stock are
registered for sale or resale on currently effective registration statements,
and substantially all of the remaining shares of reserved Common Stock are
entitled to registration rights under the Securities Act. The issuance of a
significant number of shares of Common Stock upon the exercise of stock options
and warrants, or the sales of a substantial number of shares of Common Stock
pursuant to Rule 144 or otherwise, could adversely affect the market price of
the Common Stock.

ANTI-TAKEOVER PROVISIONS

     The Company's Certificate of Incorporation and the Delaware General
Corporation Law (the "DGCL") contain certain provisions that may delay or
prevent an attempt by a third-party to acquire control of the Company. In
addition, the severance provisions of employment agreements with certain members
of management could impede an attempted change of control of the Company.

DILUTION AND ABSENCE OF DIVIDENDS

     The exercise price of the Warrants is higher than the net tangible book
value per share of the Common Stock. Warrant holders exercising at $8.44 per
share of Common Stock will incur immediate and substantial dilution in the
amount of $6.68 per share. Future equity financings may cause further dilution
to investors. The Company has never paid dividends on its Common Stock and will
not pay dividends in the foreseeable future.

POSSIBLE REDEMPTION OF WARRANTS

     The Warrants are subject to redemption at any time by the Company at $.05
per warrant, on 30 days prior written notice, if the closing sale price of the
Common Stock exceeds 140% of the current exercise price (presently $8.44) for 30
consecutive business days ending within 15 days of the date of the notice of
redemption. If the Warrants are redeemed, warrantholders will lose their right
to exercise the Warrants except during such 30-day redemption period. Redemption
of the Warrants could force the holders to exercise the Warrants at a time when
it may be disadvantageous for the holders to do so or to sell the Warrants at
the then market price or accept the redemption price of $.05 per warrant.

DISCLOSURE REGARDING FORWARD LOOKING STATEMENTS

     This Prospectus includes "forward looking statements" within the meaning of
Section 27A of the Securities Act and Section 21E of the Exchange Act. All
statements other than statements of historical fact included in and incorporated
by reference into this Prospectus are "forward looking statements." Such forward
looking statements include, without limitation, statements under "Risk Factors
- -- Need for Additional Funds; History of Operating Losses" regarding TBC's
estimate of sufficiency of existing capital resources and ability to raise
additional capital to fund cash requirements for future operations, and "Risk
Factors -- No Assurance of Regulatory Approval; Need for Extensive Clinical
Trials" regarding the uncertainties involved in the drug development process and
the timing of regulatory approvals required to market these drugs. 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,
without limitation, (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.

                                       10

<PAGE>   11


                                 USE OF PROCEEDS

     Assuming all of the Warrants are exercised, the net proceeds to the Company
are estimated to be approximately $33.7 million after deduction of estimated
offering expenses. The Company anticipates that approximately $25.0 million of
the net proceeds will be used for the clinical development of product
candidates, including NOVASTAN(R), and for the continued research and
development of biopharmaceuticals for the treatment of cardiovascular and other
diseases. The remaining net proceeds are expected to be used to fund general and
administrative expenditures and capital expenditures for laboratory and office
expansion, laboratory equipment and scientific instrumentation.

     The preceding represents estimates only, and actual allocation of the net
proceeds for such purposes and timing of the expenditures will be dependent on
various factors, including the progress of the Company's research and
development programs, the results of preclinical and clinical trials, the timing
of regulatory approvals, competitive developments, payments, if any, under any
collaborative arrangements entered into by the Company and the availability of
additional financing. Such expenditures are likely to be substantial and to
exceed the net proceeds of this Offering. The Company may also use a portion of
the net proceeds to acquire, by license, purchase or other arrangement,
businesses, technologies, or products that complement the Company's business,
although the Company does not have any agreement or understanding, nor is it
presently engaged in any discussions or negotiations, with respect to any
acquisition, and there can be no assurance that any acquisition will be made.
The Company's board of directors has broad discretion in determining how the
proceeds of this Offering will be applied.

     Pending ultimate application, the net proceeds from this Offering will be
invested with other funds or the Company in cash equivalents and short-term
investments, including U.S. government securities and high-grade corporate
investments, commercial paper and bankers acceptances, at the discretion of the
Company.

     If some or all of the Warrants expire unexercised, the Company may need to
seek additional funding through collaborative agreements and/or through public
or private financing. See "Risk Factors--Need for Additional Funds; History of
Operating Losses."

                                    DILUTION

     The net tangible book value of the Company at December 31, 1998, was
approximately $33.2 million or $0.97 per share of Common Stock. "Net tangible
book value" per share is equal to the Company's total tangible assets less its
total liabilities, divided by the number of shares of Common Stock outstanding.
Assuming all the Warrants are exercised and the estimated net proceeds therefrom
are applied as described in "Use of Proceeds," the pro forma net tangible book
value of the Company at December 31, 1998, would have been approximately $66.9
million or $1.76 per share. This represents an immediate increase in net
tangible book value of $.79 per share to existing stockholders and an immediate
dilution in net tangible book value of $6.68 per share to purchasers of Common
Stock upon exercise of the Warrants. The following table illustrates this per
share dilution:


<TABLE>
<S>                                                                                         <C>
Warrant exercise price................................................................      $8.44
     Net tangible book value prior to exercise of the Warrants........................       0.97
     Increase per share attributable to exercise of the Warrants......................       0.79
Pro forma net tangible book value after exercise of the Warrants......................       1.76
                                                                                            -----
Dilution in net tangible book value to Warrant holders upon exercise..................      $6.68
                                                                                            =====
</TABLE>

                              PLAN OF DISTRIBUTION

     The Shares issuable upon exercise of the Warrants may be distributed if,
and when, such Warrants are exercised by the holders thereof. The Company may
solicit the exercise of the Warrants at any time by reducing the exercise price
of the Warrants. The Company also has the right to redeem the Warrants on the
terms described in this

                                       11

<PAGE>   12


Prospectus. As of the date of this Prospectus, the Company does not have the
right to call the Warrants because the Common Stock has not traded at or above
the required price.

     The Company may engage one or more broker-dealers to solicit the exercise
of Warrants in compliance with the provisions of Regulation M promulgated under
the Exchange Act. The Company may pay any such broker-dealer a fee based on the
exercise price of Warrants solicited for exercise which are exercised. Pursuant
to the terms of the Warrant Agreement, the Company has no obligation to pay the
Underwriter any compensation related to the exercise of the Warrants.

                                  LEGAL MATTERS

     The legality of the securities offered hereby will be passed on for the
Company by Porter & Hedges, L.L.P., Houston, Texas.

                                     EXPERTS

     The consolidated financial statements of the Company as of December 31,
1998 and 1997 and for each of the years in the three-year period ended December
31, 1998, have been incorporated by reference herein and in the Registration
Statement in reliance upon the report of KPMG LLP, independent certified public
accountants, incorporated by reference herein, and upon the authority of said
firm as experts in accounting and auditing.

     The statements in this Prospectus under the caption "Risk Factors --
Uncertainty Regarding Patents and Proprietary Information" and other references
herein to intellectual property matters have been reviewed and approved by
Rockey, Milnamow and Katz, Ltd., Chicago, Illinois, patent counsel for the
Company, as experts on such matters, and are included herein in reliance upon
that review and approval.

                                       12

<PAGE>   13


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

     NO PERSON IS AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS IN CONNECTION WITH THIS OFFERING OTHER THAN THOSE CONTAINED IN
THIS PROSPECTUS, AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST
NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY. NEITHER THE
DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY
CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE
AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF OR THAT THE INFORMATION CONTAINED
HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO ITS DATE. THIS PROSPECTUS DOES
NOT CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF AN OFFER TO BUY ANY
SECURITIES IN WHICH IT RELATES. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO
SELL OR A SOLICITATION OF AN OFFER TO BUY SUCH SECURITIES IN ANY CIRCUMSTANCES
IN WHICH SUCH OFFER OR SOLICITATION IS UNLAWFUL.

                         TEXAS BIOTECHNOLOGY CORPORATION


                                3,995,394 Shares
                                       of
                                  Common Stock

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

                                   PROSPECTUS

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

                                January 17, 2000

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

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                               ----

<S>                                                                                                              <C>
AVAILABLE INFORMATION.............................................................................................2

INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE...................................................................2

THE COMPANY.......................................................................................................3

RISK FACTORS......................................................................................................4

USE OF PROCEEDS..................................................................................................11

DILUTION ........................................................................................................11

PLAN OF DISTRIBUTION.............................................................................................11

LEGAL MATTERS....................................................................................................12

EXPERTS  ........................................................................................................12
</TABLE>

                                       13


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