Encysive Pharmaceuticals Reports Fourth Quarter and Year End 2006 Financial Results

Conference Call Scheduled for Today at 8:00 a.m. Eastern Time


HOUSTON, March 9, 2007 (PRIME NEWSWIRE) -- Encysive Pharmaceuticals (Nasdaq:ENCY) today announced financial results for the fourth quarter and year ended December 31, 2006, and also provided financial guidance related to 2007.



 Fourth Quarter 2006 Financial Overview

  * For the fourth quarter of 2006, the Company reported a net loss
    of approximately $25.8 million, or $0.44 per basic and diluted
    share, compared to a net loss of approximately $19.4 million, or
    $0.33 per basic and diluted share, for the same period last year.
    The increased loss in the current quarter was primarily the result
    of the Company's costs associated with building the commercial
    infrastructure necessary to launch Thelin(r)(1) (sitaxentan
    sodium(2)) 100 mg tablets in Europe, maintaining its U.S.
    commercial infrastructure, and other selling, general and
    administrative costs.

  * Revenues in the fourth quarter of 2006 were approximately $5.4
    million, as compared to $5.6 million for the fourth quarter of
    2005. Argatroban royalties in the fourth quarter of 2006 were $4.8
    million, based on the tiered royalty structure of our agreement
    with GlaxoSmithKline (GSK), where we achieved the highest level of
    Argatroban royalty payments in the third quarter this year, as
    compared to the fourth quarter last year. Late in the fourth
    quarter of 2006, the Company made Thelin(r) commercially available
    in the United Kingdom and in Germany, yielding net sales of
    approximately $0.3 million for the quarter and year.

  * Cash and cash equivalents at December 31, 2006 were $43.8
    million, compared to $49.9 million at September 30, 2006 and
    $127.9 million at December 31, 2005. The 2006 year-end cash
    balance included gross proceeds of $18.0 million raised through
    the sale of the Company's common stock, utilizing the Company's
    equity line of financing with Azimuth Opportunity Ltd. (Azimuth).

 Year 2006 Financial Highlights

  * Revenues in 2006 were approximately $19.0 million, compared to
    $14.0 million in 2005. The increase in 2006 revenue is primarily
    due to higher royalties earned on higher sales of Argatroban by
    GSK. Argatroban royalties were $17.4 million in 2006, compared to
    $12.9 million in 2005, an increase of 34.9%. As a result of the
    recent sale of the Argatroban Notes by our subsidiary as described
    below, future royalty revenues from sales of Argatroban will be
    used to pay interest and to repay the Argatroban Notes, and will
    not be available to fund our operations until the Argatroban Notes
    are paid in full.

  * Total research and development expenses of approximately $64.4
    million in 2006 were flat as compared to research and development
    spending of $63.5 million in 2005. A significant portion of the
    spending in research and development during 2006 was related to
    ongoing long-term safety studies of Thelin(tm) (STRIDE-3), the
    initiation of a Phase II study evaluating Thelin(tm) in diastolic
    heart failure, and support of global Thelin(tm) regulatory
    submissions.

  * Total selling, general and administrative expenses increased to
    $63.7 million in 2006, up from $28.3 million in 2005, an increase
    of $35.4 million. This higher level of spending was driven by
    costs associated with building the Company's commercial
    infrastructure to support the European launch of Thelin(r),
    maintaining the U.S. commercial infrastructure, and other selling,
    general and administrative costs.

  * Net loss for the year ended December 31, 2006 was approximately
    $109.3 million, or $1.86 per basic and diluted share, compared to
    a net loss of $74.9 million, or $1.29 per basic and diluted share,
    for 2005. The $34.4 million increase in net loss for 2006 was
    primarily due to increased investment in commercialization-related
    expenditures associated with Thelin(tm) and other selling, general
    and administrative costs.

 Recent and Q4 Company Highlights

  * In February 2007, Encysive's newly formed wholly-owned
    subsidiary, Argatroban Royalty Sub LLC, placed $60.0 million in
    aggregate principal amount of non-convertible notes (Argatroban
    Notes) in a private placement to institutional investors. The
    Argatroban Notes are secured by royalties to be paid to Royalty
    Sub from sales of Argatroban by GSK and by a pledge by Encysive of
    the stock of Royalty Sub. Net proceeds from the financing were
    approximately $56.0 million, of which $10.0 million was withheld
    pending confirmation of treaty relief from U.K. tax withholding
    obligations. Encysive expects to use the net proceeds for general
    corporate purposes, including the development of pipeline products
    and to support sales and marketing of Thelin(r) in the European
    Union and maintaining commercial readiness in the United States.

  * In October 2006, Encysive entered into a common stock equity
    financing line with Azimuth pursuant to which Encysive may sell to
    Azimuth up to $75.0 million of common stock or 11,853,012 shares
    of common stock, whichever comes first. During the 18-month term
    of the equity line, Encysive may sell, at its sole discretion,
    registered shares of its common stock to Azimuth at a
    predetermined discount to the market price, subject to certain
    conditions. Encysive made two drawdowns, issuing an aggregate of
    3,086,351 shares of common stock, for total gross proceeds of
    $18.0 million in 2006. Encysive intends to use the net proceeds of
    this equity line for general corporate purposes, including for
    developing and commercializing the Company's products.

  * In December 2006, the U.S. Food and Drug Administration (FDA)
    accepted the Company's complete response to the July 24, 2006
    approvable letter for Thelin. The FDA designated the submission as
    a Class 2 review and assigned a new Prescription Drug User Fee Act
    (PDUFA) target action date of June 15, 2007.

  * Late in the fourth quarter of 2006, the Company made Thelin(r)
    commercially available in the United Kingdom and Germany. The
    Company expects subsequent product launches in other E.U. member
    states as national governments approve pricing and reimbursement.

   * On March 7, 2007, Encysive announced that the Australian
    Therapeutic Goods Administration (TGA) had granted marketing
    approval for Thelin(r) (sitaxentan sodium) 100 mg tablets as a
    once daily oral treatment for patients with pulmonary arterial
    hypertension.

"Encysive was able to strengthen its balance sheet through the recently announced Argatroban royalty monetization financing, and we have the opportunity to raise additional funds through the sale of common stock utilizing our equity line of financing," commented Gordon H. Busenbark, Chief Financial Officer of Encysive. "Coupled with strategic expense management, these financings will support the continued commercial launch of Thelin(r) in the European Union, while maintaining our commercial readiness in the United States, in preparation for the June 15 PDUFA date."



 2006 Company Highlights

  * In August 2006, the European Commission granted marketing
    authorization for Thelin(r) (sitaxentan sodium) 100 mg tablets.
    Thelin(r) is indicated for the treatment of patients with
    pulmonary arterial hypertension (PAH) classified as World Health
    Organization (WHO) functional class III, to improve exercise
    capacity. Efficacy has been shown in primary pulmonary
    hypertension and pulmonary hypertension associated with connective
    tissue disease. Thelin(r) is the first selective endothelin A
    receptor antagonist, and first once daily oral treatment available
    for patients with PAH. The European Commission's centralized
    licensing procedure permits Encysive to market Thelin(r) in all 27
    member states of the European Union.

  * Encysive established a European headquarters near London, England
    with regional sales offices in Germany, France and Italy.

  * On March 24, 2006, Encysive received an approvable letter from
    the FDA, identifying several concerns and observations that needed
    to be resolved before Thelin(tm) could be approved in the United
    States. The Company's complete response to the March 2006
    approvable letter was accepted by the FDA in May 2006 and
    designated as a Class 1 submission. Encysive received a second
    approvable letter on July 24, 2006, stating that one substantive
    item raised in the March approvable letter remained unresolved. In
    December 2006, the FDA accepted the Company's complete response to
    the July 2006 approvable letter and designated it as a Class 2
    submission, assigning a new PDUFA target action date of June 15,
    2007.

  * In March 2006, Encysive initiated a Phase II clinical trial
    evaluating the potential of Thelin(tm) 100 mg as an oral treatment
    for diastolic heart failure. In November 2006, the Company
    presented data regarding an intravenous formulation of Thelin(tm)
    in patients undergoing coronary revascularization (CABG),
    suggesting a potential additional therapeutic target for selective
    endothelin A receptor therapy.

  * In December 2006, the FDA granted Encysive clearance to resume
    clinical testing with oral and intravenous formulations of
    TBC3711, the Company's next-generation, highly selective
    endothelin receptor antagonist. A Phase II dose ranging study of
    oral TBC3711 in patients with resistant hypertension, and all
    clinical trials with the drug, had been placed on clinical hold by
    the FDA in March 2006. Clinical testing of TBC3711 is expected to
    resume in Q2 2007.

  * Thelin(tm) clinical data in PAH was presented at premier medical
    meetings in the United States and Europe, including the American
    College of Cardiology (ACC), American Thoracic Society
    International Conference (ATS), European League Against
    Rheumatology (EULAR) Annual European Congress, European Society of
    Cardiology (ESC) World Congress of Cardiology, European
    Respiratory Society (ERS) Annual Congress, and the American
    College of Chest Physicians (CHEST).

Outlook for 2007

As of March 1, 2007, after receipt of net proceeds from the sale by Royalty Sub of the Argatroban Notes, Encysive had cash and cash equivalents of approximately $71.9 million.

Although Encysive has recently received additional funds from its equity financing line with Azimuth and from the sale by Royalty Sub of the Argatroban Notes, the Company anticipates the need to raise additional funds, whether Thelin is approved by the FDA or not. Subject to certain conditions, Encysive may issue and sell additional shares of the Company's common stock to Azimuth under the equity financing line and may receive $10.0 million upon the confirmation of treaty relief from U.K. withholding obligations pursuant to the terms of the Argatroban Notes. Encysive could also issue common stock, debt, or other securities for gross aggregate proceeds of up to $95.5 million pursuant to the Company's effective shelf registration statement. Since the Company's capital resources are currently insufficient to meet our 2007 cash requirements, our independent auditor's report will contain a statement relating to their substantial doubt about our ability to continue as a going concern.

As the outcome of Encysive's regulatory filings with the FDA and other regulatory authorities is uncertain, the Company is unable, at this time, to project revenues for Thelin in the United States and other countries. Encysive has just begun commercializing Thelin(r) in Europe, and as such, cannot make any projections or financial forecasts of sales or operating expenses.

If we receive approval by the FDA to market Thelin in the United States, and if we are successful in obtaining additional funding, we believe that our operating expenses will exceed those incurred in 2006. If we do not receive approval by the FDA, we expect to take actions to significantly reduce our operating expenses. In any event, we anticipate that we will continue to incur operating losses throughout 2007.

Upcoming Presentations and Events



 * March 12-15 Cowen and Company 27th Annual Health Care Conference*
               Boston

 * May 2-3     Deutsche Bank 32nd Annual Health Care Conference*
               Washington, D.C.

 * May 14-15   Acumen BioFin/Rodman &Renshaw 4th Annual Global
               Healthcare Conference*
               Monte Carlo, Monaco

 * Meeting will be webcast at www.encysive.com

Conference Call Information

Encysive will host a conference call today, Friday, March 9 at 8:00 a.m. ET, to discuss fourth quarter and total 2006 financial results. You may access the call either through the call-in number below or through the audio webcast. The access number for the call is:

Number: (612) 332-0345

Passcode: Encysive Pharmaceuticals

This call is being webcast and can be accessed via Encysive's web site at www.encysive.com.

A replay of the webcast will be available on the Company's web site through April 9, 2007. Additionally, a replay of the call will be available until Tuesday, March 13, 2007 at 11:59 p.m. ET. The call replay can be accessed by calling:

Number: (320) 365-3844

Access Code: 861503

About THELIN(tm) and PAH

Thelin(r) (sitaxentan sodium), an endothelin A receptor antagonist for the treatment of PAH, received marketing approval in the European Union in August 2006. Encysive's New Drug Application (NDA) for Thelin (sitaxsentan sodium) is currently under review by the Cardio-Renal Division of the FDA. Thelin is a small molecule that blocks the action of endothelin, a potent mediator of blood vessel constriction and growth of smooth muscle in vascular walls. Endothelin receptor antagonists may prove to be effective in the treatment of a variety of diseases where the regulation of vascular constriction is important. Thelin is 6,500-fold selective in the targeting of the endothelin A receptor versus the endothelin B receptor.

Pulmonary arterial hypertension (PAH) is a condition that involves high blood pressure and structural changes in the walls of the pulmonary arteries, which are the blood vessels that connect the right side of the heart to the lungs. PAH causes shortness of breath, limits activity, and is eventually fatal unless treated successfully with heart/lung or lung transplantation. PAH is estimated to afflict approximately 100,000 to 200,000 people worldwide, many of whom are children and young women.

About Encysive Pharmaceuticals

Encysive Pharmaceuticals Inc. is a biopharmaceutical company engaged in the discovery, development and commercialization of novel, synthetic, small molecule compounds to address unmet medical needs. Our research and development programs are predominantly focused on the treatment and prevention of interrelated diseases of the vascular endothelium and exploit our expertise in the area of the intravascular inflammatory process, referred to as the inflammatory cascade, and vascular diseases. To learn more about Encysive Pharmaceuticals please visit our web site: http://www.encysive.com.

The Encysive Pharmaceuticals Inc. logo is available at http://media.primezone.com/prs/single/?pkgid=843

Notes:

(1) Thelin(r) is an E.U. registered trademark of Encysive Pharmaceuticals Inc.

(2) "Sitaxentan" sodium is the spelling recognized by the World Health Organization for Encysive Pharmaceuticals' sitaxsentan sodium.

This press release contains "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. These forward-looking statements are subject to certain risks, trends and uncertainties that could cause actual results to differ materially from those projected. Among those risks, trends and uncertainties are: unexpected delays in regulatory approval of Thelin by the FDA in the U.S. and our other products under development, including TBC3711; the unpredictability of the duration and results of regulatory review of new drug applications and investigational new drug applications by the FDA; decisions by the FDA regarding whether and when to approve our NDA for Thelin;our estimate of the sufficiency of our existing capital resources; our ability to raise additional capital to fund cash requirements for future operations; the availability of sufficient funds to commercialize Thelin in the U.S. should it be approved by the FDA; market acceptance of Thelin in the EU and Australia and the actual rate of acceptance; the impact of reimbursement policies and governmental regulation of prices for Thelin in the EU and Australia; our inability to predict revenues from Thelin and our expense levels in 2007 and beyond; the ability of our subsidiary to repay the notes secured by royalties on the sales of Argatroban; our ability to obtain treaty relief from the U.K. withholding tax requirements; our ability to manufacture and sell any products, potential drug candidates, their potential therapeutic effect, market acceptance or our ability to earn a profit from sales or licenses of any drug candidate; and our ability to discover new drugs in the future, as well as more specific risks, trends and uncertainties facing Encysive such as those set forth in its reports on Forms 8-K, 10-Q and 10-K filed with the U.S. Securities and Exchange Commission. Given these risks, trends and uncertainties, any or all of these forward-looking statements may prove to be incorrect. Therefore you should not rely on any such forward-looking statements. Furthermore, Encysive undertakes no duty to update or revise these forward-looking statements. The Private Securities Litigation Reform Act of 1995 permits this discussion.



            ENCYSIVE PHARMACEUTICALS INC. AND SUBSIDIARIES
                        SELECTED FINANCIAL DATA
             Amounts in thousands (except per share data)
                              (Unaudited)
             Condensed Consolidated Summary of Operations
             --------------------------------------------

                           Three Months Ended     Twelve Months Ended
                               December 31,          December 31,
                           -------------------   ---------------------
                             2006       2005       2006        2005
                           --------   --------   ---------   ---------
 Revenues                  $  5,440   $  5,579   $  18,995   $  14,006
 Expenses
 Cost of goods sold              80         --          94          --
 Research and development    15,114     13,567      64,440      63,496
 Sales and marketing          9,775      8,000      41,417      15,953
 General and administrative   5,879      3,793      22,325      12,341
                           --------   --------   ---------   ---------
 Total expenses              30,848     25,360     128,276      91,790
                           --------   --------   ---------   ---------
 Operating loss             (25,408)   (19,781)   (109,281)    (77,784)

 Investment income              581      1,399       3,811       4,683
 Interest expense              (974)      (989)     (3,920)     (3,111)
                           --------   --------   ---------   ---------
 Net loss from continuing
  operations                (25,801)   (19,371)   (109,390)    (76,212)
 (Loss) income from
  discontinued operations        --         --          --       1,335
                           --------   --------   ---------   ---------
 Loss before cumulative
  effect of change in
  accounting principle      (25,801)   (19,371)   (109,390)     74,877
 Cumulative effect of
  change in accounting
  principle                      --         --         107          --
                           --------   --------   ---------   ---------
 Net loss                  $(25,801)  $(19,371)  $(109,283)  $ (74,877)
                           ========   ========   =========   =========
 Net loss per common share
  (basic and diluted):     $  (0.44)  $  (0.33)  $   (1.86)  $   (1.29)
                           ========   ========   =========   =========
 Weighted average common
  shares outstanding
  (basic and diluted):       59,297     58,201      58,630      57,959

                 Condensed Consolidated Balance Sheets
                 -------------------------------------

                                       December 31,    December 31,
                                           2006            2005
                                        ---------       ---------
 ASSETS
 Cash, cash equivalents, investments
  and accrued interest                  $  43,798       $ 127,913
 Other assets                              19,339          18,789
                                        ---------       ---------
 Total assets                           $  63,137       $ 146,702
                                        =========       =========

 LIABILITIES AND STOCKHOLDERS
  (DEFICIT) EQUITY
 Current liabilities                    $  26,854       $  26,151
 Long-term debt                           130,000         130,000
 Deferred income                               --           1,286
 Stockholders' deficit                    (93,717)        (10,735)
                                        ---------       ---------
 Total liabilities and
  stockholders'  deficit                $  63,137       $ 146,702
                                        =========       =========


            

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