Intranasal corticosteroids are the most potent and effective agents for the treatment of AR; they are recommended as first-line agents for moderate/severe or persistent AR. These agents effectively reduce inflammation of the nasal mucosa and improve mucosal pathology through their anti-inflammatory mechanism of action.

How long does it take for intranasal corticosteroids to work?

Intranasal corticosteroids take time to work. They may begin to give relief to allergy symptoms after about six to 10 hours, but full relief may not be obtained for three to six weeks with daily use.

What do intranasal corticosteroids do?

A nasal corticosteroid spray reduces swelling and mucus in the nasal passageway. The sprays work well for treating: Allergic rhinitis symptoms, such as congestion, runny nose, sneezing, itching, or swelling of the nasal passageway. Nasal polyps, which are noncancerous (benign) growths in the lining of the nasal passage.