Cymbicort, also known as budesonide formoterol powder inhaler, can provide an anti-inflammatory effect, and is mainly used in the clinical treatment of asthma and other various bronchial diseases. The main ingredients of budesonide formoterol powder inhaler are budesonide and formoterol. As an inhaled glucocorticoid, budesonide can have anti-inflammatory effects. Budesonide is a selective β2-adrenergic receptor agonist, which can clinically play a role in relieving bronchospasm and diastolic bronchial smooth muscle. It can improve symptoms such as wheezing and dyspnea caused by airflow limitation, and is mainly used in the treatment of bronchial asthma, effectively reducing the number of acute asthma attacks and protecting lung function. It is contraindicated in people who are allergic to budesonide and formoterol. It is contraindicated in patients who have had an allergic reaction to the inhalation of lactose. Agitation, nervousness and nausea may occur with the use of budesonide formoterol powder inhaler. Use with caution in athletes. Gradual dose reduction is required when discontinuing the product. It should not be stopped suddenly. Patients should use the medication under the supervision of a doctor and should not use it privately to avoid any adverse effects.