Budesonide aerosol needs to rinse the mouth after inhalation, Budesonide is a glucocorticoid with anti-inflammatory and immunosuppressive effects. Currently small doses of inhaled glucocorticoids are the drugs of choice for the prevention and treatment of bronchial asthma. Budesonide remaining in the mouth after inhalation can cause dry mouth, abnormal taste, and the possibility of causing oral fungal infections and hoarseness. Therefore, the mouth should be rinsed with water 2-3 times as soon as possible after inhalation, and the mouthwash should be spit out and not swallowed. Inhaled budesonide quickly into the trachea, bronchial tubes and take effect, so inhalation of the drug after rinsing the mouth in a timely manner will not affect the efficacy of the drug.