Hypersensitivity to parexocib or sulphonamides. History of serious allergic drug reaction of any type especially cutaneous reactions (eg, SJS, TEN, erythema multiforme). Patients who have experienced bronchospasm, acute rhinitis, nasal polyps, angioneurotic oedema, urticaria or other allergic-type reactions after taking ASA or NSAIDs including other COX-2 specific inhibitors. Active peptic ulceration or GI bleeding. Inflammatory bowel disease. CHF (NYHA II-IV). Post-op pain treatment following CABG surgery. Ischemic heart disease, peripheral arterial disease &/or cerebrovascular disease. Severe hepatic impairment (serum albumin <25 g/L or Child Pugh class C). Pregnancy (3rd trimester). Lactation.