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Intranasal glucocorticoids are effective in the treatment of allergic rhinitis. Their effectiveness as an anti-inflammatory adjunct in the treatment of acute recurrent sinusitis has not been adequately established in a controlled clinical study.

The purpose of this study was to test the hypothesis that intranasal corticosteroid treatment produces additional relief in the treatment of acute sinusitis with oral antibiotics.

Patients who were 12 years old and older with a history of recurrent sinusitis were treated while experiencing a new episode of acute sinusitis, which was diagnosed by symptoms and confirmed by computed tomography scan of the paranasal sinuses. Patients were treated for 21 days with amoxicillin clavulanate potassium and randomized to receive concurrent mometasone furoate nasal spray (MFNS; Nasonex [400 μg, twice daily]; n = 200 patients) or placebo spray (twice daily; n …