The investigators will repeat this previous concept, but compare intranasal fluticasone with azelastine (an antihistamine) nasal spray versus placebo nasal spray, in atopic asthmatic patients on inhaled steroid. This will be to assess effects on methacholine PC20, the primary outcome, and to assess the effects on the following secondary outcomes: Exhaled nitric oxide (FeNO), FEV1, morning peak expiratory flow (PEF), impulse oscillometry, peak nasal inspiratory flow (PNIF), nasal nitric oxide (NO), blood eosinophils, eosinophilic cationic protein (ECP), nasal symptoms, asthma control and quality of life; and rhinitis quality of life.