Nasal airways resistance was measured in ten patients with allergic rhinitis during intranasal application of an extract of grass pollen. Pretreatment with placebo did not inhibit the increase in nasal airways resistance, whereas ICI 74,917 administered from a pressurized aerosol gave almost complete protection. ICI 74,917 was well tolerated and no evidence was obtained of local hyposensitization during the period of the study.
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