There are individual differences in the time for nebulized inhalation to take effect. For mild upper respiratory tract infections, nebulized inhalation can take effect in 3 days, while for severe coughing and wheezing, treatment can take effect only in 1 week, and the specific number of nebulized inhalation will depend on the specific situation. Nebulized inhalation is a common treatment method in respiratory medicine, which is to deliver phlegm-forming drugs, bronchodilators, hormonal drugs, etc. into the airway by nebulized inhalation, and the drugs act directly on the affected area, with faster onset of action, lower dose and fewer side effects. Depending on the severity of the disease, nebulized inhalation is done 1-2 times a day. For mild cough and itchy throat caused by upper respiratory tract infection and pneumonia, nebulized inhalation can be effective in 3-5 days; if severe cough and phlegm persist for a long time, nebulized inhalation is needed for more than 1 week to be effective. Asthma patients with allergic inflammation are more sensitive to hormones, and often have the possibility of 1 time effect, but still need to follow up other treatment to consolidate. Nebulized inhalation should strictly grasp the indications and medication norms, and if bronchospasm, co-infection, nervousness, or drug side effects occur, the medication should be stopped or changed in a timely manner under the guidance of a respiratory medicine physician.