Budesonide formoterol has the effect of relaxing bronchial smooth muscle and relieving bronchospasm, clinically used in the treatment of asthma and chronic obstructive pulmonary disease. Budesonide formoterol is a combination of budesonide and formoterol fumarate, clinically used for the relief and maintenance treatment of asthma and chronic obstructive pulmonary disease. Adverse effects of budesonide formoterol use include: cardiovascular system can be seen palpitations, blood pressure abnormalities, etc.; metabolic system can be seen hypokalemia, hyperglycemia, glaucoma, etc.; respiratory system can be seen in oropharyngeal Candida infections, cough, bronchospasm, etc.; neurological system can be seen in headache, anxiety, depression, etc.; other occasional urticaria, nausea, taste abnormalities, tremor, etc.. Budesonide formoterol is prohibited if there is allergy to the product or inhalation of lactose (containing a small amount of cow’s milk protein) with an allergic reaction, the initial treatment of asthma is prohibited, asthma or acute exacerbation of COPD is prohibited, asthma, COPD symptoms are significantly aggravated or acutely worsened is prohibited; pregnant women and lactating women should be used with caution, athletes should be used with caution. Budesonide formoterol should be rinsed with water promptly after each inhalation to minimize the risk of fungal oropharyngitis; discontinuation of the product requires a gradual reduction in the dose and should not be discontinued abruptly. If there is a need to use the drug or need to be used in combination with other drugs, it is necessary to use under the guidance of a doctor to avoid serious adverse consequences.