Aminosalicylates or 5-ASAs are used for inducing and maintaining remission in Crohn’s Disease and Ulcerative Colitis. They reduce inflammation in the damaged lining of the intestine. Each brand works differently, releasing active drug in different part of the intestine. (Sulfasalazine may also be used in other condition like Rheumatoid Arthritis).
Your doctor will start you on the one that will give you the most benefit. It is important that you stick to the same medication unless your doctor tells you otherwise.