A randomized controlled trial was conducted to assess the effect of long-term low-dose macrolides therapy for chronic sinusitis. Patients with chronic sinusitis were randomly divided into two groups, i.e. the administration group and the non-administration group, using the envelope method. The administration group was treated for 8 weeks with the oral administration of 100mg/day of clarithromycin and 30mg/day of serrapeptase while the non-administration group was given 30mg/day of serrapeptase alone. The number of patients finally entered into the statistical analysis was 14 and 15 for the administration and non-administration groups, respectively. The subjective symptoms (rhinorrhea, postnasal drip, nasal obstruction, hyposmia and headache), objective signs (volume of rhinorrhea, quality of rhinorrhea, postnasal drip and nasal mucosal edema) and the X-ray findings on paranasal sinuses were scored and any differences between the scores before treatment and after treatment were regarded as an improvement. The difference between the improvement in the two groups was analyzed using Mann-Whitney's U test. Consequently, the improvement in the administration group was found to be significantly higher than in the non-administration group regarding subjective symptoms at 6 weeks (p<0.05) and regarding objective signs at 2 weeks (p<0.05), at 4 weeks (p<0.01), 6 weeks (p<0.01) and 8 weeks (p<0.05) and also for the X-ray findings at 8 weeks (p<0.05). In conclusion, long-term low-dose clarithromycin therapy is thus considered to be effective for treatment of chronic sinusitis.
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