What is Triamcinolone? Triamcinolone belongs to a class of drugs called corticosteroids. It prevents the release of substances in the body that cause inflammation. Triamcinolone oral (taken by mouth) is used to treat many different conditions such as allergic disorders, skin conditions, ulcerative colitis, arthritis, lupus, psoriasis, or breathing disorders. Triamcinolone may also be used for purposes not listed in this medication guide.