Nonexclusive Name: metoprolol tartrate (me TOE virtuoso lol) Brand Names: Lopressor, Toprol-XL What is Lopressor (metoprolol)? Metoprolol is in a social event of meds called beta-blockers. Beta-blockers impact the heart and scattering (blood travel through courses and veins). Metoprolol is used to treat angina (midsection misery) and (hypertension). It is moreover used to treat or balance heart strike. Metoprolol may similarly be used for purposes other than those recorded in this pharmaceutical helper.