Doxorubicin mainly has a calming effect and can be used to treat bronchial asthma, chronic wheezing bronchitis and other breathing difficulties caused by bronchospasm. Doxorubicin is a bronchodilator that acts directly on the bronchial tubes to inhibit asthma by inhibiting phosphodiesterase in smooth muscle cells, thereby relaxing bronchial smooth muscle. Based on its pharmacological effects, it is mainly used for bronchial asthma, chronic wheezing bronchitis and other breathing difficulties caused by bronchospasm. The use of the drug should be noted that it is prohibited for patients with acute myocardial infarction, and it should not be used if the patient is allergic to theophylline drugs such as doxorubicin or xanthine derivatives. It should also be used with caution if the patient has heart disease, hypertension, chronic pulmonary heart disease, hyperthyroidism, liver disease, peptic ulcer, renal insufficiency and co-infection. Caffeinated beverages or foods containing caffeine should not be consumed at the same time as the medication. In conclusion, Doxorubicin has a calming effect and can be used to improve breathing difficulties caused by respiratory diseases.