Mesalazine is a medication primarily used to treat inflammatory bowel diseases, such as ulcerative colitis and Crohn's disease. It works by reducing inflammation in the intestines, helping to alleviate symptoms like abdominal pain and diarrhea. Mesalazine is often taken in the form of tablets or as a rectal suppository, depending on the area of the intestine that needs treatment. This drug is generally well-tolerated, but some patients may experience side effects, including headaches, nausea, or abdominal discomfort. Regular monitoring by a healthcare provider is recommended to ensure its effectiveness and manage any potential adverse reactions.