Background: Topical corticosteroid is now accepted as safe and most effective in controlling all symptoms of both allergic and nonallergic rhinitis. Fluticasone propionate aqueous nasal spray is a new once daily topical corticosteroid preparation, Objective: To evaluate the efficacy and safety of fluticasone propionate in children 5 to 11 years of age with perennial allergic rhinitis. Method: A double-blind, placebo-controlled, parallel group of 127 recruited patients of whom 106 were evaluated. Treatment with once daily fluticasone propionate 100 mu g or placebo for 4 weeks followed by a 2-week followup period. Fifty-three patients of each group were treated with fluticasone propionate or placebo by randomized assignment. Results: There was no statistical significance of the sex, mean age, weight, and height of the two groups. Patients treated with fluticasone propionate showed a significant decrease in total symptom scores rated by physicians at 2 weeks and 4 weeks, respectively (P < .01, P < .05). The rhinitis symptom scores in treatment group rated by patients (nasal blockage, sneezing, rhinorrhea) were significantly decreased at 2 weeks (P < .05, P < .01). Nasal symptoms as assessed by doctors (turbinate swelling, color of nasal mucosa, secretion, and postnasal drip) also decreased at 2 and 4 weeks, but were not statistically significant, except for the secretion at 2 weeks and postnasal drip at 4 weeks (P < .05). There was no evidence of effects on adrenal function by morning plasma cortisol concentration between the two groups. Conclusion: Fluticasone propionate was safe and effective in children aged 5 to 11 years with perennial allergic rhinitis.