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Atenolol (Tenormin) is a beta-blocker that affects the heart and circulation (blood flow through arteries and veins).
Atenolol is used to treat angina (chest pain) and hypertension (high blood pressure).
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.
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;
diabetes;
overactive thyroid;
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.
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.
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.
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.
Follow your doctor's instructions about any restrictions on food, beverages, or activity.
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:
dizziness;
feeling tired; or
depressed mood.
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.
Tell your doctor about all your current medicines and any you start or stop using, especially:
digoxin, digitalis;
indomethacin;
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.
Medically reviewed by USARx EDITORIAL TEAM Last updated on 1/1/2020.
Source: Drugs.com Atenolol (www.drugs.com/atenolol.html).
Commonly reported side effects of atenolol include: cardiac failure, bradycardia, dizziness, fatigue, and cold extremity. See below for a comprehensive list of adverse effects.
Applies to atenolol: oral tablet
Oral route (Tablet)
Following abrupt cessation of certain beta-blocking agents, exacerbations of angina pectoris and, in some cases, myocardial infarction and ventricular arrhythmias have occurred. As with other beta blockers, when discontinuation of atenolol is planned, the patients should be carefully observed and advised to minimize physical activity. If the angina worsens or acute coronary insufficiency develops, promptly reinstitute atenolol, at least temporarily. Warn patients against interruption or discontinuation of therapy without advice of physician
Along with its needed effects, atenolol may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur while taking atenolol:
More common
Less common
Rare
Incidence not determined
Get emergency help immediately if any of the following symptoms of overdose occur while taking atenolol:
Symptoms of overdose
Some side effects of atenolol may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
More common
Less common
Incidence not determined
Applies to atenolol: compounding powder, injectable solution, oral tablet
The more commonly reported side effects associated with this drug are hypotension, tiredness, and dizziness.
Bradycardia and hypotension were reported more frequently in patients following a myocardial infarction than among those receiving the drug for treatment of hypertension. In a large study, after a myocardial infarction, patients were more likely to reduce the dosage or discontinue this drug due to bradycardia and hypotension.
Common (1% to 10%): Bradycardia, hypotension, cold extremities, heart failure deterioration, heart block precipitation, postural hypotension with or without syncope
Rare (0.01% to 0.1%): Intermittent claudication exacerbation, Raynaud's phenomenon
Frequency not reported: Left ventricular insufficiency
Postmarketing reports: Sick sinus syndrome
Very common (10% or more): Tiredness (up to 26%)
Common (1% to 10%): Fatigue
Frequency not reported: Malaise, tinnitus
Very common (10% or more): Dizziness (up to 13%)
Common (1% to 10%): Vertigo, lightheadedness, lethargy, drowsiness
Rare (0.01% to 0.1%): Headache, paresthesia
Frequency not reported: Ataxia
Very common (10% or more): Depression (up to 12%)
Common (1% to 10%): Dreaming
Uncommon (0.1% to 1%): Sleep disturbances,
Rare (0.01% to 0.1%): Mood changes, nightmares, confusion, psychoses, hallucinations
Frequency not reported: Vivid dreams, insomnia
Common (1% to 10%): Wheezing, dyspnea, pulmonary emboli
Rare (0.01% to 0.1%): Bronchospasm
Frequency not reported: Asthma, nasal congestion
Common (1% to 10%): Gastrointestinal disturbances, diarrhea, nausea
Rare (0.01% to 0.1%): Dry mouth
Frequency not reported: Indigestion, constipation
Common (1% to 10%): Leg pain
Uncommon (0.1% to 1%): Transaminase level elevation
Rare (0.01% to 0.1%): Hepatic toxicity including intrahepatic cholestasis
Postmarketing reports: Elevated bilirubin
Uncommon (0.1% to 1%): Renal failure
Frequency not reported: Increased blood urea, increased serum creatinine
Rare (0.01% to 0.1%): Purpura, alopecia, psoriasiform skin reactions, psoriasis exacerbations, skin rash
Rare (0.01% to 0.1%): Impotence
Postmarketing reports: Peyronie's disease
Rare (0.01% to 0.1%): Thrombocytopenia
Rare (0.01% to 0.1%): Dry eyes, visual disturbances
The clinical significance of elevated ANA levels is unknown.
Very rare (less than 0.01%): Increase in antinuclear antibodies (ANA)
Frequency not reported: Angioedema, urticaria
Medically reviewed by USARx EDITORIAL TEAM Last updated on 1/1/2020.
Source: Drugs.com Atenolol (www.drugs.com/atenolol.html).
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