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Generic Name: Metoprolol

Brands: Toprol XL, Lopressor

Class: Beta-blockers

Availability: Prescription only

Molecular Formula: C15H25NO3

Substance UNII: GEB06NHM23

What is Metoprolol?

Metoprolol is a beta blocker. It is often sold under trade names Lopressor and Toprol XL.

What is Metoprolol Used For?

Used alone or in combination with other medications, metoprolol treats high blood pressure, also known as hypertension. Metoprolol can additionally treat chest pain (angina) and improve survival after a heart attack. Medical providers may prescribe metoprolol in combination with other medications to treat heart failure. This drug can also treat irregular heartbeats, known as arrhythmias.

How Does Metoprolol Work?

Metoprolol works by relaxing blood vessels and slowing heart rate, which improves blood flow throughout the body and subsequently decreases blood pressure.

How Long Does it Take for Metoprolol to Work?

Metoprolol can begin to work in just two hours, but it may take up to a week to take full effect.

Do Not Use Metoprolol If:

There are several situations where this medication may not be the right choice for an individual. According to the FDA, people with the following conditions should not use metoprolol:

  • Dangerously slow heart rate, known as severe bradycardia
  • Heart block greater than first degree, which is the early stage of a condition characterized by an abnormal heart rhythm where the heart beats too slowly
  • Cardiogenic shock, a condition in which the heart suddenly cannot pump well enough to supply the body with the blood it needs
  • Decompensated cardiac failure, which is a sudden worsening of the signs and symptoms of heart failure
  • Sick sinus syndrome, a group of heart rhythm problems, unless the patient has a permanent pacemaker in place
  • Hypersensitivity to any component of this medication

Please note that this list may not be complete, and there may be other situations where use of this drug is not advisable.

Disclaimer: this article does not constitute or replace medical advice. If you have an emergency or a serious medical question, please contact a medical professional or call 911 immediately. To see our full medical disclaimer, visit our Terms of Use page.

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