Carvedilol and metoprolol succinate have different ingredients and mechanisms of action. 1. Different ingredients: the main ingredient of Carvedilol is Carvedilol, the main ingredient of Metoprolol Succinate is Metoprolol, Carvedilol is a common tablet, and Metoprolol Succinate is available in various dosage forms. 2. Different mechanisms of action: Carvedilol has a blocking effect on both β-receptors and α-receptors, and Metoprolol Succinate belongs to the category of highly selective β-blockers, which have the effect of lowering high blood pressure and controlling the heart rate, but Carvedilol is able to dilate the peripheral vasculature by blocking α-receptors, which can further enhance the control of blood pressure. Carvedilol and metoprolol succinate have similar adverse reactions and contraindications to dizziness, bradycardia, hypotension, nausea, and vomiting, and are contraindicated in patients who are allergic to the components of both drugs, bradycardia, bronchial asthma, second-degree, third-degree atrioventricular block, and cardiogenic shock. The specific choice of which drug should be used under the guidance of a doctor.