Absorption: Well absorbed after oral administration. Distribution: Crosses the blood-brain barrier, crosses the placenta; small amounts enter breast milk. Metabolism and Excretion: Mostly metabolized by the liver (primarily by CYP2D6; the CYP2D6 enzyme system exhibits genetic polymorphism); ~7% of population may be poor metabolizers and may have significantly ↑ metoprolol concentrations and an ↑ risk of adverse effects. TIME/ACTION PROFILE (cardiovascular effects)When switching from immediate-release to extended-release product, the same total daily dose can be used PO: (Adults) Antihypertensive/antianginal– 25–100 mg/day as a single dose initially or 2 divided doses; may be ↑ q 7 days as needed up to 450 mg/day (immediate-release) or 400 mg/day (extended-release) (for angina, give in divided doses). MI– 25–50 mg (starting 15 min after last IV dose) q 6 hr for 48 hr, then 100 mg twice daily. Heart failure– 12.5–25 mg once daily (of extended-release), can be doubled every 2 wk up to 200 mg/day. Migraine prevention– 50–100 mg 2–4 times daily (unlabeled). IV: (Adults) MI– 5 mg q 2 min for 3 doses, followed by oral dosing. Tablets (tartrate): 25 mg, 50 mg, 100 mg Cost: Generic: All strengths $7.18/100Extended-release tablets (succinate; Toprol XL): 25 mg, 50 mg, 100 mg, 200 mg Cost: Generic: 25 mg $35.68/100, 50 mg $41.93/100, 100 mg $53.95/100, 200 mg $84.54/100Solution for injection: 1 mg/m LIn Combination with:hydrochlorothiazide (Dutoprol, Lopressor HCT). See combination drugs.metoprolol is a sample topic from the Davis's Drug Guide. Metoprolol is used alone or together with other medicines to treat high blood pressure (hypertension). High blood pressure adds to the workload of the heart and arteries. If it continues for a long time, the heart and arteries may not function properly. This can damage the blood vessels of the brain, heart, and kidneys, resulting in a stroke, heart failure, or kidney failure. A lower blood pressure can reduce the risk of strokes and heart attacks. Metoprolol is also used to treat severe chest pain (angina) and lowers the risk of repeated heart attacks. It is given to people who have already had a heart attack.
If you have a heart attack, your doctor may give you metoprolol tartrate Lopressor. This drug can prevent another heart attack from occurring. However, you should be careful not to confuse it. Carvedilol Coreg and metoprolol tartrate Lopressor, Toprol XL are beta-adrenergic blocking agents beta-blockers used to treat high blood pressure hypertension and congestive heart failure.