The generic name of the drug Betalucil is Metoprolol, and sudden discontinuation of Metoprolol is generally not recommended for the treatment of high blood pressure in the absence of comorbidities. Metoprolol is a beta-blocker, which has some antihypertensive effect and some effect on lowering the heart rate. If the drug is suddenly stopped during the use of metoprolol, it may cause the heart rate to increase, causing the patient to experience discomfort or inducing arrhythmia, therefore, in most cases, it is not possible to stop the drug suddenly. However, if serious complications such as atrioventricular block occur while taking metoprolol, it may be necessary to stop the medication immediately to avoid aggravating the atrioventricular block and other related conditions, which may lead to serious consequences. Metoprolol can be used in the treatment of hypertension, myocardial infarction, cardiac arrhythmia and other diseases, which may lead to adverse reactions such as nausea, dizziness, sleep disorders, bradycardia, induced airway spasm and other adverse reactions, and needs to be contraindicated for conditions such as cardiogenic shock and severe atrioventricular conduction block. Therefore, during the administration of metoprolol for the treatment of hypertension, if there is a need to discontinue the drug or adjust the treatment program, it is necessary to do so under the guidance of a professional doctor.