There is no fixed time requirement for how long to take metoprolol tartrate before meals, usually it can be half an hour to one hour. The main effect of metoprolol tartrate is to inhibit beta receptors, with the effect of lowering blood pressure and slowing down the heart rate, clinically used in hypertension, coronary heart disease, supraventricular tachyarrhythmia treatment. According to the characteristics of the drug and the requirements of the drug instructions, metoprolol tartrate should be taken before meals, the specific dosing time did not make specific requirements, it is recommended that patients take half an hour to one hour before meals. Metoprolol tartrate on an empty stomach is conducive to the absorption of the drug, increase the utilization of the drug, can better play the efficacy of the drug. The adverse reactions of metoprolol tartrate include dizziness, nausea, dyspnea, cold extremities, decreased blood pressure, bradycardia, etc. It is contraindicated in patients who are allergic to the components of the drug, cardiogenic shock, second- and third-degree atrioventricular block, bronchial asthma, and hypotension. When taking Metoprolol for clinical treatment, it is important to use the drug under the guidance of a physician and choose the appropriate dosage and dosing time.