If tachyarrhythmias occur, avoid applying drugs that increase the heart rate and prohibit drugs such as epinephrine, isoprenaline, atropine and other drugs with positive muscle rate and positive frequency, which can further worsen the arrhythmia if used improperly. Some antibiotics such as antifungal ashwagandha and amphotericin B, clotrimazole, etc., have serious side effects that lead to tachycardia and even malignant arrhythmias and ventricular fibrillation. If there is a fungal infection combined with tachyarrhythmia, try to avoid the application of such drugs. Anti-amebiasis drugs such as emetine may cause premature ventricular contractions and atrial fibrillation, etc. The patient’s ECG should be strictly evaluated before using the drug. When the electrocardiogram shows tachyarrhythmias, targeted drugs should be prescribed by a professional doctor to correct the arrhythmia in time to avoid the risk of cardiac arrest and other risks, and to pay attention to contraindications to the use of drugs.