In outpatient clinics, this question is often asked, and many parents interrupt the treatment because they are worried about the side effects of long-term inhaled medication. In fact, most of the current asthma prevention and treatment medications are inhaled, and such medications introduce lipophilic genes in the chemical structure, which have high efficiency and selectivity of local action, and the dose of medication is very small, so there are few systemic side effects occurring at the conventional recommended dose, and sometimes there is oral mold or voice Sometimes there is oral mold or hoarseness, which can be avoided by rinsing the mouth after inhalation or by using a storage fog canister. However, large doses (here, large doses are small compared to systemic doses) such as corticosteroids with a daily dosage of more than 800 micrograms may have effects on bone metabolism, hypothalamic-pituitary-adrenal axis function and skin over time, but the dosage for domestic children rarely exceeds 400 micrograms per day, so the above side effects are rarely seen. Of course, we also have to consider whether a little side effect of the drug has a big impact on the body or the asthma is not controlled well on the body, and it is not advisable to worry too much about the side effects of the drug and cause aggravation or delay in treatment.