Is pulmicort an antihistamine

No, cortisone is a corticosteroid medication. Corticosteroids are normally produced by the cortex of the adrenal glands. You can take them as a medication because, as part of the endocrine system, they reduce the inflammation response, and can lessen swelling and itching.

With respect to their use, they are often faster-acting and better at alleviating swelling and itching than antihistamines, and they have less side effects. However, long-term use can have negative consequences.