Pentasa is a medication that contains the active ingredient mesalazine, which belongs to a group of medicines called aminosalicylates. Mesalazine works by reducing inflammation in the digestive tract, particularly in conditions like ulcerative colitis and Crohn's disease. Pentasa is suitable for individuals who need treatment for mild to moderate inflammatory bowel disease, helping to alleviate symptoms such as diarrhea, abdominal pain, and rectal bleeding.