Twenty children aged 3 to 14 years with a history of bronchial asthma complicated by chronic sinusitis were studied in a double‐blind study. Patients received, at random, over a period of 2 weeks, either 2 ml saline or 2 ml bromhexine (2 mg/ml) t.i.d. by means of a home nebulizer. A significant decline of clinical symptoms during both nebulization treatments as compared to the pretreatment symptom score was observed (mean score of 1.5 ± 0.7 and 0.5 ± 0.8, respectively, (P0.01). Both types of nebulization were equally efficient in reducing the symptom score. Radiological abnormalities were significantly more reversed after saline nebulization as compared with bromhexine (P<0.05), although both treatments showed radiological improvement (P<0.01). The present study indicates that nebulization with saline may have some beneficial effect on chronic sinusitis in asthmatic children. Bromhexine was not superior to saline for this purp