The generic name of Symbicort Dupont is Budesonide Formoterol Powder Inhalation Powder Mist. Lung function diagnosis of bronchial asthma inhalation budesonide formoterol powder a little useless may be the reason is not out of the allergen, not regular use of the drug, not the correct use of inhalation device, the dose is not enough, is not a disease of bronchial asthma and so on. 1. Not free from allergens: bronchial asthma patients need to avoid contact with dust mites, pollen and other allergens, so as not to trigger recurrent bronchial asthma attacks. 2. No regular use of medication: some patients do not use medication regularly, which can greatly reduce the effectiveness of the medication. 3. Not using the inhalation device correctly: the mouth is not completely wrapped around the nozzle when inhaling the drug, resulting in the drug not being completely inhaled, affecting the efficacy of the treatment. When the drug is completely inhaled, the patient does not hold his breath and exhale slowly and gently. Some patients exhale more forcefully, resulting in the inhaled drug being spat out and affecting the efficacy of the drug. 4. Insufficient dose: budesonide formoterol powder inhalation powder aerosol has different dosage type, may use a small dose of inhaled hormone can not relieve asthma attacks. 5. Not bronchial asthma disease: may be caused by other diseases that cause bronchospasm caused by pulmonary function diastolic or excitation test positive, not bronchial asthma. If the lung function diagnosis of bronchial asthma inhaled budesonide formoterol powder is ineffective, it is recommended to regular hospitals, under the guidance of the doctor to clarify the cause, follow the doctor’s instructions for treatment, so as not to delay the condition.