HOUSTON, Dec. 14, 2006 (PRIME NEWSWIRE) -- Encysive Pharmaceuticals (Nasdaq:ENCY) today announced it has provided the information requested by the U.S. Food and Drug Administration (FDA) in its letter to the Company dated December 13, 2006 regarding the Company's New Drug Application (NDA) for Thelin(tm) (sitaxsentan sodium) 100 mg tablets. This submission is Encysive's response to the FDA's determination that the Company's November 2, 2006 submission was not complete. The FDA is currently evaluating Thelin(tm) as a potential new oral treatment for pulmonary arterial hypertension.