Normal human pulse beat is 60~100 beats/min, pulse lower than 60 beats/min is bradycardia, should be alert to some drugs that will slow down the heart rate, such as β-blockers, some anti-arrhythmic drugs, digitalis, etc.. 1. β-blockers: such as metoprolol, by antagonizing the binding of β-receptors, can produce a negative inotropic effect, i.e., slowing down the heart rate and reducing myocardial contractility. This can cause the heart rate to fall further. 2. Some antiarrhythmic drugs: such as verapamil, belonging to the calcium antagonist, can reduce the heart rate by reducing the autoregulation of sinus node cells and prolonging the conduction velocity of the atrioventricular junction. 3. digitalis: digitalis has the effect of enhancing myocardial contractility, but also through the prolongation of atrioventricular junction conduction and thus reduce the heart rate. If the patient’s heart rate is lower than 60 beats per minute, or if the patient has uncomfortable symptoms, it is recommended to go to the regular hospital and follow the doctor’s instructions.