An object of the present invention is to provide methods for preventing or treating a steroid-resistant or steroid-dependent inflammatory bowel disease. The object can be achieved by a method for preventing or treating a steroid-resistant or steroid-dependent inflammatory bowel disease in a patient in need of the prevention or treatment of the inflammatory bowel disease, comprises administering an effective amount of adrenomedullin, a modified product thereof having an activity of suppressing steroid-resistant or steroid-dependent inflammation, or a salt thereof having an activity of suppressing steroid-resistant or steroid-dependent inflammation, to the patient.
