Patients who cannot drink heart-stabilizing pellets are as follows: i. Patients suffering from sinus bradycardia cannot drink this medicine because the effect of heart-stabilizing pellets is to slow down the heart rate. If you drink this medicine, it will aggravate the condition and may even induce cardiac arrest. Second, patients suffering from atrioventricular block cannot take this medicine, because if they suffer from atrioventricular block, especially moderate or severe atrioventricular block, they also cannot drink heart-stabilizing pellets. Third, patients suffering from sick sinus node syndrome should not take this medicine either, it will make the heart rate even slower. Fourth, in addition to slow arrhythmogenic diseases, patients who are allergic to the drug or have severe renal insufficiency also need to consider that they cannot use heart-stabilizing granules. Fifth, pregnant women and nursing mothers should not take heart stabilizing granules either.