After the variant cough is relieved, it is necessary to decide whether salmeterol can be re-sprayed every few days after a comprehensive assessment of the condition. Salmeterol is a long-acting β2 agonist, which is used for the long-term maintenance treatment of asthma; when the symptoms of atopic cough are relieved with this drug, the dosage can be gradually reduced after the doctor’s comprehensive assessment of the condition, so as to avoid the reoccurrence and exacerbation of asthma caused by the sudden discontinuation of the drug. Because salmeterol belongs to the potent β2 agonist, after the use of the drug can be retained in the body for a long time in the concentration of the drug, the bronchodilator effect usually lasts for 12 hours, within 72 hours from the body to clear; variant cough in the use of the drug after the relief of the doctor with the assessment of the condition of the two days after the re-spraying, to maintain the effective concentration of the drug therapy for a long time. The drug may cause palpitations, headache and other discomforts after use, and for people with aortic valve stenosis, tachycardia is prohibited; in the use of the drug should be noted that it can not be used for the treatment of acute asthma attacks, severe or critical asthma attacks; and pregnant women and lactating mothers and other special populations, need to be guided by a doctor to use the drug. If you need to use the drug, it is recommended to use the drug under the guidance of a doctor, not blindly self-medication, in order to avoid adverse effects.