Warning Do not stop taking this medicine (metoprolol extended-release capsules) all of a sudden. If you do, chest pain that is worse and in some cases heart attack may occur. Professional guide for Metoprolol. Includes: pharmacology, pharmacokinetics, contraindications, interactions, adverse reactions and more. Metoprolol is the generic form of the brand-name drug Lopressor, prescribed to treat high blood pressure and prevent angina (chest pain). Metoprolol is a type of medication called a beta blocker. Metoprolol slows down your heart rate and makes it easier for your heart to pump blood around your body. Your very first dose of metoprolol may make you feel dizzy, so take it at bedtime. Find information about common, infrequent and rare side effects of Metoprolol Succinate Oral. COMMENTS ON CLASSIFICATION. There are so many types of drugs for asthma and COPD (chronic obstructive pulmonary disease), plus different ways of taking them, that it can be confusing to everyone - doctors, nurses, patients, families. Find patient medical information for Metoprolol Succinate Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Metoprolol oral tablet is a prescription medication used to treat high blood pressure, chest pain, and heart stress after a heart attack. It's a drug called a beta-blocker. It's available as. Medical uses. Metoprolol is used for a number of conditions, including hypertension, angina, acute myocardial infarction, supraventricular tachycardia, ventricular tachycardia, congestive heart failure, and prevention of migraine headaches. Metoprolol ER is an inexpensive drug used to treat high blood pressure and prevent chest pain. It is also used after a heart attack to prevent an additional heart attack from occurring.