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Background: Azithromycin has broad spectrum and is effective to treat several bacterial respiratory tract infection. It is also relatively safe and tolerable to pediatric patient. Careful use of azithromycin is also required for the prescribers because it could cause cardiovascular toxicity (QTc prolongation) and ototoxicity. There has been no study on duration of azithromycin use in pediatric patients in Korea. Methods: The outpatient sample data on the azithromycin prescription was obtained from Korean health insurance review and assessment service. The characteristics of azithromycin prescription were analyzed with two different years (2011 and 2014). Results: Total 4,215 cases were analyzed. The azithromycin was prescribed the most frequently in the children (73.2% in 2011 and 62.5% in 2014) and for the condition of bronchopneumonia (28.7% in 2011 and 21.7% in 2014) in both years. The duration of prescribed for azithromycin has significantly different between 2011 and 2014. In 2014, 94.3% of prescription were indicated less than 5 days, but 86.6% were in 2011. Acute bronchiolitis and bronchopneumonia prescriptions more longer duration of treatment compared with acute bronchitis and others. Conclusion: The pattern of prescribing azithromycin has been changed for the treatment of several infectious diseases in pediatric patients. The rate of appropriate duration of azithromycin treatment has increased.