The use of gentamicin and dexamethasone to do nebulized inhalation, mainly local anti-inflammatory effect, gentamicin is a kind of antibiotic, for bacterial infections caused by lung inflammation, nebulized inhalation of the treatment effect is better, the local use of medication side effects are also less. Dexamethasone is a kind of glucocorticoid, can weaken the local inflammatory reaction, for the relief of more serious respiratory infections also has a certain effect. Dexamethasone can also relieve the phenomenon of bronchospasm, because it can reduce the local inflammatory response. However, gentamicin is now less commonly used in nebulized inhalation therapy because local use of antibiotics can easily produce resistance, leading to antibiotic abuse. So now more commonly used is the use of bronchodilators and glucocorticoids, or the use of sputum-thinning drugs to carry out nebulized inhalation treatment, antibiotics local use is relatively small, and now tend to use intravenous drip way to carry out the treatment.