SummaryTopical corticosteroids represent first‐line treatment in patients with moderate–severe persistent allergic rhinitis. Topical steroids have a wide range of anti‐inflammatory properties, particularly suppression of the release of Th2‐type cytokines from T cells and also from mast cells and basophils. Topical corticosteroids are effective against all nasal symptoms including nasal blockage. They are more potent than oral antihistamines and topical cromones. They may also improve seasonal asthma. Potential disadvantages include a slightly slower onset of effect (days), the need for regular treatment and occasional local irritation/bleeding. The properties of an ideal intranasal corticosteroid include high efficacy against all nasal symptoms, a rapid onset of action and a proven once‐daily dosing schedule. Local corticosteroid preparations should be acceptable to patients with low or absent local/systemic side‐effects. There should be no long‐term adverse effects on the nasal mucosa. Triamcinolone acetonide (TAA) aqueous nasal spray meets these criteria and a particular advantage is its lack of taste and smell, which may improve acceptability and compliance in some patients.