INDICATIONS Myocardial Infarction. Lopressor ampuls are indicated in the treatment of hemodynamically stable patients with definite or suspected acute myocardial infarction to reduce cardiovascular mortality when used in conjunction with oral Lopressor maintenance therapy. Metoprolol is a beta-blocker that affects the heart and circulation (blood flow through arteries and veins). Metoprolol is used to treat angina (chest pain) and hypertension (high blood pressure). It is also used to lower your risk of death or needing to be hospitalized for heart failure. Metoprolol Compare prices, print coupons and get savings tips for Lopressor (Metoprolol) and other Hypertension, Heart Attack, and Angina drugs at CVS, Walgreens, and other pharmacies. Prices start at $3.60 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. Lopressor is a beta-blocker that affects the heart and circulation (blood flow through arteries and veins). Lopressor is used to treat angina (chest pain) and hypertension (high blood pressure). Lowers blood pressure and controls heart rate. Lopressor (metoprolol tartrate) lowers high blood pressure, controls chest pain, and helps treat heart failure and heart attack. How to use Lopressor. See also Warning section. Take this medication by mouth, with or right after a meal, as directed by your doctor, usually 1-3 times a day. Lopressor (metoprolol tartrate) Tablets and Injection is a selective beta-adrenoreceptor blocking agent (beta-blocker) used to treat high blood presure (hypertension), angina, and heart attacks. Ischemic Heart Disease Do not abruptly discontinue Lopressor therapy in patients with coronary artery disease. Severe exacerbation of angina, myocardial infarction and ventricular arrhythmias have been reported in patients with coronary artery disease following the abrupt discontinuation of therapy with beta-blockers. Metoprolol, marketed under the tradename Lopressor among others, is a medication of the selective β 1 receptor blocker type. It is used to treat high blood pressure, chest pain due to poor blood flow to the heart, and a number of conditions involving an abnormally fast heart rate. It is also used to prevent further heart problems after.