Generic Name: atenolol (a TEN oh lol)
Brand Names: Tenormin
Medically reviewed by Sanjai Sinha, MD Last updated on Dec 1, 2018.
What is atenolol?
Atenolol (Tenormin) is a beta-blocker that affects the heart and circulation (blood flow through arteries and veins).
Atenolol is also used to lower the risk of death after a heart attack.
You should not use this atenolol if you have a serious heart condition such as "AV block," very slow heartbeats, or heart failure.
Do not stop taking atenolol without first talking to your doctor. Stopping suddenly may make your condition worse.
If you are having any type of surgery, be sure the surgeon knows ahead of time that you are using this medicine.
Atenolol 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 atenolol.
Atenolol 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.
If you are being treated for high blood pressure, keep using this medication even if you feel fine. High blood pressure often has no symptoms. You may need to use blood pressure medication for the rest of your life.
Before taking this medicine
You should not use atenolol if you are allergic to it, or if you have:
a serious heart condition such as "AV block" (second or third degree);
very slow heartbeats; or
decompensated heart failure.
To make sure atenolol is safe for you, tell your doctor if you have:
congestive heart failure;
coronary artery disease;
asthma, bronchitis, emphysema;
liver or kidney disease;
pheochromocytoma (tumor of the adrenal gland);
peripheral vascular disease such as Raynaud's syndrome; or
allergies (or if you are undergoing allergy treatments or skin-testing).
Using atenolol during pregnancy could harm the unborn baby. Tell your doctor if you are pregnant or if you become pregnant while using this medicine.
Atenolol can pass into breast milk and may harm a nursing baby. Tell your doctor if you are breast-feeding a baby.
Atenolol is not approved for use by anyone younger than 18 years old.
How should I take atenolol?
Take atenolol exactly as it was prescribed for you. 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.
If you need surgery, tell the surgeon ahead of time that you are using atenolol.
It may take up to 2 weeks before you get the full effect of atenolol. Keep using the medication as directed and tell your doctor if you feel any new symptoms.
You should not stop taking atenolol suddenly. Stopping suddenly may make your condition worse.
If you are being treated for high blood pressure: Keep using this medicine 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.
Your condition may need to be treated with a combination of drugs. Use all medications as directed by your doctor. Read the medication guide or patient instructions provided with each medication. Do not change your doses or medication schedule without your doctor's advice.
Store at room temperature away from moisture, heat, and light. Keep the bottle tightly closed when not in use.
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.
Overdose symptoms may include extreme weakness or lack of energy, very slow heart rate, shortness of breath, or fainting.
What should I avoid while taking atenolol?
Follow your doctor's instructions about any restrictions on food, beverages, or activity.
Atenolol side effects
Get emergency medical help if you have signs of an allergic reaction to atenolol: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
new or worsening chest pain;
slow or uneven heartbeats;
a light-headed feeling, like you might pass out;
shortness of breath (even with mild exertion), swelling, rapid weight gain; or
a cold feeling in your hands and feet.
Common atenolol side effects may include:
feeling tired; or
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.
What other drugs will affect atenolol?
Tell your doctor about all your current medicines and any you start or stop using, especially:
any other beta-blocker--bisoprolol, carvedilol, labetalol, metoprolol, nebivolol, propranolol, sotalol, timolol, and others; or
heart or blood pressure medication--amiodarone, clonidine, diltiazem, disopyramide, nicardipine, nifedipine, reserpine, verapamil, and others.
This list is not complete. Other drugs may interact with atenolol, 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 atenolol 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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- Drug class: cardioselective beta blockers
Other brands: Tenormin