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Lopressor

Generic Name: metoprolol (me TOE pro lol)
Brand Name: Lopressor, Metoprolol Succinate ER, Metoprolol Tartrate, Toprol-XL

Medically reviewed on March 26, 2018

What is Lopressor?

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). It is also used to treat or prevent heart attack.

Lopressor may also be used for other purposes not listed in this medication guide.

Important Information

You should not use this medication if you have a serious heart problem (heart block, sick sinus syndrome, slow heart rate), severe circulation problems, severe heart failure, or a history of slow heart beats that caused fainting.

Before taking this medicine

You should not use this medication if you are allergic to Lopressor, or other beta-blockers (atenolol, carvedilol, labetalol, this medicine, nadolol, nebivolol, propranolol, sotalol, and others), or if you have:

  • a serious heart problem such as heart block, sick sinus syndrome, or slow heart rate;

  • severe circulation problems;

  • severe heart failure (that required you to be in the hospital); or

  • history of slow heart beats that have caused you to faint.

To make sure Lopressor is safe for you, tell your doctor if you have:

It is not known whether Lopressor will harm an unborn baby. Tell your doctor right away if you become pregnant while using this medicine.

Metoprolol can pass into breast milk and may harm a nursing baby. Tell your doctor if you are breast-feeding a baby.

Lopressor is not approved for use by anyone younger than 18 years old.

How should I take Lopressor?

Follow all directions on your prescription label. Your doctor may occasionally change your dose to make sure you get the best results. Do not take this medicine in larger or smaller amounts or for longer than recommended.

Take the medicine at the same time each day.

Lopressor should be taken with a meal or just after a meal.

A Toprol XL tablet can be divided in half if your doctor has told you to do so. The half tablet should be swallowed whole, without chewing or crushing.

While using Lopressor, you may need frequent blood tests at your doctor's office. Your blood pressure will need to be checked often.

If you need surgery, tell the surgeon ahead of time that you are using Lopressor.

You should not stop using Lopressor suddenly. Stopping suddenly may make your condition worse.

If you are being treated for high blood pressure, keep using this medication even if you feel well. High blood pressure often has no symptoms. You may need to use blood pressure medication for the rest of your life.

Store at room temperature away from moisture and heat.

What happens if I miss a dose?

Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

What should I avoid while taking Lopressor?

Lopressor may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert.

Drinking alcohol can increase certain side effects of Lopressor.

Lopressor side effects

Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have:

  • very slow heartbeats;

  • a light-headed feeling, like you might pass out;

  • shortness of breath (even with mild exertion), swelling, rapid weight gain; or

  • cold feeling in your hands and feet.

Common side effects may include:

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

See also: Side effects (in more detail)

What other drugs will affect Lopressor?

Tell your doctor about all medicines you use, and those you start or stop using during your treatment with Lopressor, especially:

This list is not complete. Other drugs may interact with metoprolol, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide.

Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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