There is no strict limit to the interval of nebulization treatment, generally the next nebulization is feasible after an interval of 4-6 hours, and a few patients can follow the medical advice according to their conditions. Nebulization therapy is a treatment method for respiratory diseases, which uses a nebulization device to disperse drugs into small particles and then enter the respiratory tract in the form of aerosols to achieve the purpose of local treatment. Nebulization therapy can make the drug reach the airway directly, increasing the concentration of drugs in the airway and reducing systemic reactions. Generally, the effect of nebulized aerosols in the airway decreases after 4-6 hours, when nebulization therapy can be performed again to ensure the therapeutic efficacy. Some patients with serious conditions may need to increase the number of nebulization, but the frequency of nebulization should be adjusted under the guidance of the doctor, not arbitrarily decided. In addition, different respiratory diseases use different types of drugs and doses of nebulizer treatment, patients should follow medical advice for nebulizer treatment to avoid causing adverse reactions.