Each tablet contains Metoprolol tartrate 100 mg. For a full list of excipients, see section 6.1. How to use Metoprolol Tartrate. 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) Injection, USP. DESCRIPTION. Lopressor, metoprolol tartrate USP, is a selective beta1-adrenoreceptor blocking agent, available in 5- mL ampuls for intravenous administration. Metoprolol tartrate tablets should be administered orally. The tablets should be taken on an empty stomach. The dose must always be adjusted to the individual requirements of the patient. If you have a heart attack, your doctor may give you metoprolol tartrate (Lopressor). This drug can prevent another heart attack from occurring. Drug Information on Lopressor, Metoprolol Succinate ER, Metoprolol Tartrate (metoprolol) includes drug pictures, side effects, drug interactions, directions for use, symptoms of overdose, and what to avoid. What should I discuss with my healthcare provider before taking metoprolol? You should not use this medicine if you are allergic to metoprolol, or other beta-blockers (atenolol, carvedilol, labetalol, nadolol, nebivolol, propranolol, sotalol, and others), or if you have: Metoprolol, marketed under the tradename Lopressor among others, is a medication of the selective β1 receptor blocker type. Package leaflet: Information for the patient Metoprolol Tartrate 50 mg tablets Metoprolol Tartrate 100 mg tablets Metoprolol Tartrate Read all of this leaflet carefully before you start taking this medicine because it contains Before taking this medicine. You should not use this medicine if you are allergic to Metoprolol Tartrate, or other beta-blockers (atenolol, carvedilol, labetalol, nadolol, nebivolol, propranolol, sotalol, and others), or if you have.