The effect of locally applied ipratropium aerosol on the nasal methacholine challenge in patients with allergic and non-allergic rhinitis

The effect of local pretreatment with ipratropium versus placebo aerosol on nasal methacholine challenge was studied in a double-blind, crossover trial. Fourteen allergic and ten non-allergic patients suffering from rhinitis participated in this study. It can be concluded that intranasal administration of ipratropium has a suppressive effect on hypersecretion and sneezing, but has no influence on nasal airway resistance.