A biologic is a medicine for Crohn's disease, prescribed to reduce inflammation—swelling and irritation—in your digestive tract. Crohn's involves an abnormal immune reaction that causes this inflammation. Many Crohn's medicines work by reducing immune system activity to lower that inflammation. The goals are to ease your symptoms, prevent flares, and reach remission. Remission is a time when symptoms ease or disappear, and it can last weeks or years. Medicines cannot cure Crohn's, but they can bring on and maintain remission. No single treatment works for everyone. Your care team chose this medicine based on your symptoms and where your inflammation is. Ask them what to expect from your treatment and how it will be given.