Background Cystic fibrosis is a genetic disorder in which abnormal mucus in the lungs is associated with susceptibility to persistent infection. Pulmonary exacerbations are when symptoms of infection become more severe. Antibiotics are an essential part of treatment for exacerbations and inhaled antibiotics may be used alone or in conjunction with oral antibiotics for milder exacerbations or with intravenous antibiotics for more severe infections. Inhaled antibiotics do not cause the same adverse e ects as intravenous antibiotics and may prove an alternative in people with poor access to their veins. This is an update of a previously published review. Objectives To determine if treatment of pulmonary exacerbations with inhaled antibiotics in people with cystic fibrosis improves their quality of life, reduces time o school or work and improves their long-term survival. Search methods We searched the Cochrane Cystic Fibrosis Group's Cystic Fibrosis Trials Register.