The anthracyclines and paclitaxel drugs are currently the mainstay of the treatment regimens routinely used for breast cancer. Their adverse effects include bone marrow suppression, hair loss, gastrointestinal reactions, and then one more serious one is cardiotoxicity. Myelosuppression, hair loss, and gastrointestinal reactions are reversible, but cardiotoxicity is irreversible. Once the heart muscle is damaged, it is unlikely to be reversed in the future. There are four types of cardiotoxic reactions caused by anthracyclines: acute, subacute, chronic and delayed toxic reactions. Acute cardiotoxicity can occur within a few hours after drug administration and is mainly characterized by transient cardiac electrophysiological and cardiac rhythm changes, with electrocardiogram showing non-specific ST-T changes, QRS low voltage, QT interval prolongation and transient arrhythmias. Very few patients may die suddenly. Subacute cardiotoxic reactions are less common, with acute left heart failure, myocarditis, and pericarditis occurring several days to weeks after drug administration. Chronic cardiotoxicity usually occurs within 1 year of treatment and is most common clinically, and its incidence is closely related to the total dose. The main manifestation is congestive heart failure and/or cardiomyopathy, which are mostly irreversible changes. Late-onset cardiotoxicity refers to occurring 1 year after completion of chemotherapy, mostly years or even a decade after the end of chemotherapy. The main manifestations are occult ventricular dysfunction, congestive heart failure and arrhythmias. For cardiotoxicity emphasis is placed on prevention, and in general early use of drugs to prevent cardiotoxicity from anthracyclines is required in chemotherapy. However, in clinical practice, we often see patients with chronic and delayed cardiotoxicity. Often, patients come in wanting to take oral Chinese medicine, and once they feel their pulse, they find that their heart rate is fast, or they have premature beats, or arrhythmias, and patients often think that chemotherapy has been completed and do not think about the current situation. Many patients can survive for a long time after breast cancer surgery, but the heart problem will obviously affect survival and quality of life if not solved. Many patients have a rapid heart rate in a calm state, and palpitations and discomfort when they move slightly vigorously. With the addition and subtraction of roasted licorice soup, patients usually have the effect after about 10 doses of oral Chinese medicine, with a significant reduction of premature beats and palpitations. Therefore, once chronic and delayed cardiotoxicity occurs, early consultation is recommended.