Budesonide formoterol inhalation powder should be budesonide formoterol powder inhaler, which is a multi-dose microinhaler. This device needs to be initialized before the first use of this product. 1. Remove the vial by unscrewing and pulling out the cap with the red handle facing down. 2. Holding the red handle part and the middle part of the bottle, rotate it to the end in any direction and then to the end in the opposite direction. Repeat this step once more after you hear a clicking sound, i.e. initialization is complete. 3. After completing the initialization, loosen and pull out the cap of the bottle, making sure that the red handle is underneath. Holding the bottom red part and the middle part of the bottle, rotate it to the end in any direction, then to the end in the opposite direction, and after hearing a clicking sound, a filling is completed. 4. When exhaling, do not exhale into the mouthpiece. Cover the mouthpiece with both lips and inhale deeply and long. Then move away and hold your breath for about 5 seconds. 5. 5. Repeat steps 3-4 if more than one inhalation is required in the prescription, and screw the cap on tightly when the medication is finished. You must rinse your mouth with water after inhaling the medication. Adverse effects such as tremors and palpitations may occur after administration and usually disappear within a few days after treatment. It is not recommended for use in children younger than 6 years of age, and regular height monitoring is recommended for children using the drug for long periods of time. The drug should be used with caution in pregnant women, breastfeeding women, and patients with athletes. The use of this drug is prohibited for those who have had an allergic reaction to budesonide, formoterol or inhaled lactose. The specific dosage and usage of the above medicines should follow the doctor’s instructions and should not be used on its own to avoid serious adverse reactions.