Medically reviewed on May 7, 2018
What is labetalol?
Labetalol is a beta-blocker that affects the heart and circulation (blood flow through arteries and veins).
Labetalol is used to treat hypertension (high blood pressure).
Labetalol may also be used for purposes not listed in this medication guide.
You should not use labetalol if you have asthma or COPD, very low blood pressure, or a serious heart condition such as second or third degree heart block, severe heart failure, or very slow heartbeats.
Before taking this medicine
You should not take labetalol if you are allergic to it, or if you have:
asthma or chronic obstructive pulmonary disease (COPD);
a serious heart condition such as second or third degree heart block, severe heart failure, or very slow heartbeats; or
a condition that causes very low blood pressure.
To make sure labetalol is safe for you, tell your doctor if you have:
pheochromocytoma (tumor of the adrenal gland);
congestive heart failure;
Labetalol can affect your pupils during cataract surgery. Tell your eye surgeon ahead of time that you are using labetalol.
It is not known whether labetalol will harm an unborn baby. Labetalol may cause heart or lung problems in a newborn if the mother takes the medication during pregnancy. Tell your doctor if you are pregnant or plan to become pregnant while taking labetalol.
Labetalol can pass into breast milk in small amounts. Tell your doctor if you are breast-feeding.
Labetalol is not approved for use by anyone younger than 18 years old.
How should I take labetalol?
Follow all directions on your prescription label. Your doctor may occasionally change your dose to make sure you get the best results. Do not use this medicine in larger or smaller amounts or for longer than recommended.
Your blood pressure will need to be checked often, and you may need frequent medical tests at your doctor's office.
If you need surgery, tell the surgeon ahead of time that you are using labetalol.
Do not skip doses or stop taking labetalol without first talking to your doctor. Stopping suddenly may make your condition worse.
Labetalol can cause false results with certain lab tests of the urine. Tell any doctor who treats you that you are using labetalol.
Taking labetalol can make it harder for you to tell when your blood sugar is low. If you have diabetes, check your blood sugar regularly.
Keep using this medicine as directed, even if you feel well. High blood pressure often has no symptoms. You may need to use blood pressure medicine for the rest of your life.
Store at room temperature away from moisture and heat.
Labetalol is only part of a complete program of treatment for hypertension that may also include diet, exercise, weight control, and other medications. Follow your diet, medication, and exercise routines very closely.
What happens if I miss a dose?
Take the missed dose as soon as you remember. Skip the missed dose if your next dose is less than 8 hours away. 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 labetalol?
Labetalol may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert. Avoid getting up too fast from a sitting or lying position, or you may feel dizzy. Get up slowly and steady yourself to prevent a fall.
Drinking alcohol can further lower your blood pressure and may increase certain side effects of labetalol.
Labetalol 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:
a light-headed feeling, like you might pass out;
slow heart rate, weak pulse, fainting, slow breathing (breathing may stop);
shortness of breath (even with mild exertion), swelling, rapid weight gain;
Common side effects may include:
nausea, upset stomach;
stuffy nose; or
tingly feeling in your scalp.
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 labetalol?
Tell your doctor about all your current medicines and any you start or stop using, especially:
insulin or oral diabetes medicine;
This list is not complete. Other drugs may interact with labetalol, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide.
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.
Copyright 1996-2018 Cerner Multum, Inc. Version: 10.01.
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