Which of the following is NOT a classification of drugs used to treat inflammatory bowel disease?

Antihistamines are not typically classified as a treatment for inflammatory bowel disease (IBD), which primarily includes conditions such as Crohn's disease and ulcerative colitis. The mainstay treatments for IBD focus on reducing inflammation and managing immune responses rather than targeting histamine pathways.

Corticosteroids are crucial in providing immediate relief from inflammation due to their potent anti-inflammatory properties. They are frequently used for flares of IBD.

Antibiotics may also play a role in IBD management, especially when infections are suspected or in certain cases of exacerbations. They can help address secondary complications like abscesses or bacterial overgrowth.

Immunomodulators are another important category, designed to modify the immune system's response to prevent further inflammation and maintain remission in patients suffering from IBD. By decreasing the activity of the immune system, they help in controlling the disease more effectively.

In summary, while corticosteroids, antibiotics, and immunomodulators are integral to treating inflammatory bowel diseases, antihistamines do not play a relevant role in this context.