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All about: metoprolol

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Generic Name: metoprolol (me TOE pro lol)
Brand Names: Lopressor, Toprol-XL

What is metoprolol?

Metoprolol is in a group of drugs called beta-blockers. Beta-blockers affect the heart and circulation (blood flow through arteries and veins).

Metoprolol is used to treat angina (chest pain) and hypertension (high blood pressure). It is also used to treat or prevent heart attack.

Metoprolol may also be used for purposes other than those listed in this medication guide.

What is the most important information I should know about metoprolol?

Do not stop taking metoprolol without first talking to your doctor. Stopping suddenly may make your condition worse.

If you need to have any type of surgery, you may need to temporarily stop using metoprolol. Be sure the surgeon knows ahead of time that you are using metoprolol.

Metoprolol can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert. Avoid drinking alcohol, which could increase drowsiness and dizziness while you are taking metoprolol.

Metoprolol is only part of a complete program of treatment for hypertension that may also include diet, exercise, and weight control. Follow your diet, medication, and exercise routines very closely if you are being treated for hypertension.

Hypertension often has no symptoms, so you may not even feel that you have high blood pressure. Continue using this medicine as directed, even if you feel well. You may need to use blood pressure medication for the rest of your life.

What should I discuss with my healthcare provider before taking metoprolol?

Do not use this medication if you are allergic to metoprolol, or if you have:
  • a heart problem such as heart block, sick sinus syndrome, or slow heart rate;

  • pheochromocytoma; or

  • problems with circulation (such as Raynaud's syndrome).

Before taking metoprolol, tell your doctor if you have:

  • congestive heart failure;

  • asthma, bronchitis, emphysema;

  • diabetes;

  • low blood pressure;

  • depression;

  • liver or kidney disease;

  • a thyroid disorder; or

  • myasthenia gravis.

If you have any of these conditions, you may not be able to use metoprolol, or you may need a dosage adjustment or special tests during treatment.

FDA pregnancy category C. This medication may be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment. Metoprolol can pass into breast milk and may harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.

How should I take metoprolol?

Take metoprolol exactly as it was prescribed for you. Do not take the medication in larger amounts or for longer than recommended by your doctor.

Take this medication with a full glass of water.

Take metoprolol at the same time every day.

Metoprolol should be taken with food 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. Chewing or crushing the pill could cause too much of the drug to be released at one time. Do not skip doses or stop taking metoprolol without first talking to your doctor. Stopping suddenly may make your condition worse.

To be sure this medication is helping your condition, your blood pressure will need to be checked on a regular basis. It is important that you not miss any scheduled visits to your doctor.

If you need to have any type of surgery, tell the surgeon that you are using metoprolol. You may need to briefly stop using metoprolol before having surgery.

Metoprolol is only part of a complete program of treatment for hypertension that may also include diet, exercise, and weight control. Follow your diet, medication, and exercise routines very closely if you are being treated for hypertension.

Hypertension often has no symptoms, so you may not even feel that you have high blood pressure. Continue using this medicine as directed, even if you feel well. You may need to use blood pressure medication for the rest of your life.

Store metoprolol at room temperature away from moisture and heat.

What happens if I miss a dose?

Take the missed dose as soon as you remember. If your next dose is less than 4 hours away, skip the missed dose and take the medicine at the next regularly scheduled time. Do not take extra medicine to make up the missed dose.

What happens if I overdose?

Seek emergency medical attention if you think you have used too much of this medicine.

Symptoms of a metoprolol overdose may include uneven heartbeats, shortness of breath, bluish-colored fingernails, dizziness, weakness, fainting, or seizure (convulsions).

What should I avoid while taking metoprolol?

Metoprolol can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert. Avoid drinking alcohol, which could increase drowsiness and dizziness while you are taking metoprolol.

Metoprolol side effects

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you have any of these serious side effects:
  • slow or uneven heartbeats;

  • feeling light-headed, fainting;

  • feeling short of breath, even with mild exertion;

  • swelling of your ankles or feet;

  • nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes);

  • depression; or

  • cold feeling in your hands and feet.

Other less serious side effects are more likely to occur, such as:

  • vomiting;

  • decreased sex drive, impotence, or difficulty having an orgasm;

  • sleep problems (insomnia);

  • tired feeling; or

  • anxiety, nervousness.

Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.

What other drugs will affect metoprolol?

Before taking metoprolol, tell your doctor if you are using:

  • digoxin (digitalis, Lanoxin);

  • clonidine (Catapres);

  • ritonavir (Norvir);

  • terbinafine (Lamisil);

  • anti-malaria medications such as chloroquine (Aralen) or hydroxychloroquine (Plaquenil, Quineprox);

  • medicine to treat depression or mental illness, such as bupropion (Wellbutrin, Zyban), fluoxetine (Prozac, Sarafem), paroxetine (Paxil), thioridazine (Mellaril), and others;

  • an MAO inhibitor such as isocarboxazid (Marplan), tranylcypromine (Parnate), phenelzine (Nardil), or selegiline (Eldepryl, Emsam);

  • a diabetes medication such as insulin, glyburide (Diabeta, Micronase, Glynase), glipizide (Glucotrol), chlorpropamide (Diabinese), or metformin (Glucophage);

  • a heart medication such as nifedipine (Procardia, Adalat), quinidine (Quinaglute, Quinidex), propafenone (Rythmol), reserpine (Serpasil), verapamil (Calan, Verelan, Isoptin), diltiazem (Cartia, Cardizem);

  • medicine for asthma or other breathing disorders, such as albuterol (Ventolin, Proventil), bitolterol (Tornalate), metaproterenol (Alupent), pirbuterol (Maxair), terbutaline (Brethaire, Brethine, Bricanyl), and theophylline (Theo-Dur, Theolair);

  • a diuretic (water pill) such as amiloride (Midamor, Moduretic), chlorthalidone (Hygroton, Thalitone), furosemide (Lasix), hydrochlorothiazide (HCTZ, HydroDiuril, Hyzaar, Lopressor, Vasoretic, Zestoretic), spironolactone (Aldactazide, Aldactone), triamterene (Dyrenium, Maxzide, Dyazide), torsemide (Demadex), and others; or

  • cold medicines, stimulant medicines, or diet pills.

If you are using any of these drugs, you may not be able to take metoprolol, or you may need dosage adjustments or special tests during treatment.

There may be other drugs not listed that can affect metoprolol. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Where can I get more information?

  • Your pharmacist has additional information about metoprolol written for health professionals that you may read.

What do the pills look like?

Metoprolol is available with a prescription under the brand names Lopressor and Toprol XL. Other brand or generic formulations of this medication may also be available. Ask your pharmacist any questions you have about this medication, especially if it is new to you.

  • Lopressor 50 mg--pink, capsule-shaped, scored tablets

  • Lopressor 100 mg--light-blue, capsule-shaped, scored tablets

  • Toprol XL 50 mg extended-release tablets--white, round, film-coated, scored tablets

  • Toprol XL 100 mg extended-release tablets--white, round, film-coated, scored tablets

  • Toprol XL 200 mg extended-release tablets--white, oval, film-coated, scored tablets

  • 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.
  • Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.
Copyright 1996-2006 Cerner Multum, Inc. Version: 9.05. Revision Date: 06/07/2007 2:21:50 PM.

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