FDA Accepts Encysive's Complete Response to THELIN New Drug Application

Conference Call Scheduled for Today at 2:15 p.m. Eastern Time


HOUSTON, Dec. 28, 2006 (PRIME NEWSWIRE) -- Encysive Pharmaceuticals (Nasdaq:ENCY) today announced that the U.S. Food and Drug Administration (FDA) has accepted for review the Company's complete response to the July 24, 2006 approvable letter regarding its New Drug Application (NDA) for THELIN(tm) (sitaxsentan sodium) 100 mg tablets. The FDA has designated the review as a Class 2 resubmission and issued a new Prescription Drug User Fee Act (PDUFA) target action date of June 15, 2007.

THELIN is currently being evaluated by the FDA as a potential new oral treatment for patients with pulmonary arterial hypertension (PAH).

The Company will work with the FDA to schedule a meeting as soon as possible in an effort to clarify the situation and move the application forward.

Encysive is currently in the process of commercializing THELIN 100 mg in the European Union, following the August 2006 receipt of marketing authorization from the European Commission. To date, THELIN has been launched in the United Kingdom and Germany.

Conference Call Information

Encysive will host a conference call today at 2:15 p.m. ET. You may access the call either through the call-in number below or through the audio webcast. Please dial-in 15 minutes prior to the start time to allow for call processing. The access number for the call is:



 Number: (612) 332-0107
 Passcode: Encysive Pharmaceuticals

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

A replay of the webcast will be available on the Company's web site through January 26, 2007. Additionally, a replay of the call will be available until Monday, January 1, 2007 at 11:59 p.m. ET. The call replay can be accessed by calling:



 Number: (320) 365-3844
 Access Code: 857478

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

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 decisions by the U.S. Food and Drug Administration regarding whether and when to approve our drug application for THELIN(tm) (sitaxsentan sodium), 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.



            

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