The PREVENT investigational program consists of two trials, PREVENT1 and PREVENT2. These are phase 3, randomized, double-blind, dose-response, stratified, placebo-controlled studies with an identical design. PREVENT2 randomized 592 subjects to receive once-daily SPD476, MMX mesalamine 1.2g, 2.4g or 4.8g, or placebo, over a period of 104 weeks. [ 1 ] The PREVENT1 trial results are expected later this year.About SPD476, MMX mesalamine [ 2,3 ] SPD476, MMX mesalamine is an anti-inflammatory drug, with each delayed-release tablet containing 1.2g of 5-aminosalicylic acid (5-ASA; mesalamine). In the U.S., SPD476, MMX mesalamine is registered as Lialda ® (mesalamine) and is approved for the induction of remission in patients with active, mild to moderate ulcerative colitis and for the maintenance of remission of ulcerative colitis. In Europe, it is registered as Mezavant ®/Mezavant XL ® and is approved for the induction of clinical and endoscopic remission in patients with mild to moderate, active ulcerative colitis and for maintenance of remission. SPD476, MMX mesalamine should be taken once daily with food. [ 2,3 ] MMX is a registered trademark of Cosmo Technologies, Ltd., Ireland. IMPORTANT SAFETY INFORMATION You should not take Lialda if you are allergic to salicylates (including mesalamine, aspirin, or aspirin-containing products) or to any of the ingredients of Lialda. Reports of problems with kidney function have been associated with mesalamine-containing products like Lialda. Tell your doctor if you have or have had problems with your kidneys. It is recommended that all patients have their kidney function checked before starting Lialda and periodically while on therapy. Products that contain mesalamine, like Lialda, have been associated with a condition that may be difficult to distinguish from an ulcerative colitis flare-up. Symptoms include cramping, stomach ache, bloody diarrhea, fever, headache, and rash. If you experience any of these symptoms, talk to your doctor immediately. Your doctor may decide to discontinue your medication.