A heartbeat of 90 beats/minute usually does not require discontinuation of metoprolol; however, the drug needs to be discontinued if it is combined with sick sinus node syndrome, low blood pressure, or acute myocardial infarction. Metoprolol can be used to treat high blood pressure, chronic heart failure and other diseases. The drug excites heart-specific receptors, which leads to a reduction in heart rate, lower cardiac output and blood pressure. The heart rate of 90 beats per minute is within the normal range of heart rate, but close to the upper limit of normal, Metoprolol can control the heart rate, so it is not recommended to stop using the drug hastily. However, it should be noted that in the event of adverse reactions such as thrombocytopenia, hallucinations, headache, sensory abnormalities, painful muscle spasms, tinnitus, coldness in the extremities, panic, syncope, etc., it is recommended to decide whether it is necessary to discontinue the medication under the guidance of the clinician. The use of the drug is contraindicated in case of cardiogenic shock, sick sinus node syndrome, atrioventricular block of II degree or higher, acute or severe decompensated heart failure, bradycardia, hypotension, drug allergy. The need to stop the use of metoprolol requires the comprehensive judgment of the clinician.