It is mainly based on the severity of the disease and the composition of the nebulized fluid, because the nebulized fluid can be added to a variety of drugs, so the interval can not be generalized. Nebulization inhalation is a commonly used clinical treatment method, nebulizing fluid can be added to a variety of drugs, all have different effects. With the popularity of home nebulizers, many people can do nebulization at home. Some people only use saline to nebulize for moisturizing the airway and promoting phlegm expulsion, and there is no major requirement for the second interval, which can usually be done 3-4 times a day or even more. If the nebulizing solution contains hormones or bronchodilators, it is usually enough to do it 2-3 times a day, with an interval of 4-6 hours between each time.