Drug NameTenormin (Atenolol) Drug UsesTenormin is prescribed for patients with high blood pressure (hypertension). It is also used to treat chest pain (angina pectoris) related to coronary artery disease. Tenormin is also useful in slowing and regulating certain types of abnormally rapid heart rates (tachycardias). Other uses for tenormin include the prevention of migraine headaches and the treatment of certain types of tremors (familial or hereditary essential tremors). How to useShould be taken before meals or at bedtime. Drug Class and MechanismTenormin is a beta-adrenergic blocking agent. Tenormin blocks the action of the sympathetic nervous system, a portion of the involuntary nervous system. The sympathetic nervous system stimulates the pace of the heart beat. By blocking the action of these nerves, tenormin reduces the heart rate and is useful in treating abnormally rapid heart rhythms. Tenormin also reduces the force of heart muscle contraction and lowers blood pressure. By reducing the heart rate and the force of muscle contraction, tenormin reduces heart muscle oxygen demand. Since angina occurs when oxygen demand of the heart exceeds supply, tenormin is helpful in treating angina. Missed DoseContinue to take this medicine even if you feel well. Do not miss any doses. If you miss a dose of this medicine, take as soon as you remember if it is more than 8 hours before the next dose is due. If it is less than 8 hours until your next dose, skip the missed dose and return to your normal dosing schedule. Do not take 2 doses at once. Storage Tablets should be stored at room temperature in a tightly closed container. Possible Side EffectsTenormin is generally well tolerated, and side effects are mild and transient. Rare side effects include abdominal cramps, diarrhea, constipation, fatigue, insomnia, nausea, depression, dreaming, memory loss, fever, impotence, lightheadedness, slow heart rate, low blood pressure, numbness, tingling, cold extremities, sore throat, and shortness of breath or wheezing. More InformationIf your doctor has instructed you to check your blood pressure and heart rate regularly, be sure to do so. Ask your doctor or pharmacist for help if you are unsure how to properly measure your blood pressure or pulse. There are several lifestyle changes that may also help reduce your blood pressure. Talk with your doctor about appropriate diet and exercise programs that may be helpful to you. Do not share this medicine with others for whom it was not prescribed. Do not use this medicine for other health conditions. Keep this medicine out of the reach of children. If using this medicine for an extended period of time, obtain refills before your supply runs out. Warnings/PrecautionsTenormin can aggravate breathing difficulties in patients with asthma, chronic bronchitis, or emphysema. In patients with existing slow heart rates (bradycardias) and heart blocks (defects in the electrical conduction of the heart), tenormin can cause dangerously slow heart rates, and even shock. Tenormin reduces the force of heart muscle contraction and can aggravate symptoms of heart failure. Calcium channel blockers, and digoxin (Lanoxin) can cause lowering of blood pressure and heart rate to dangerous levels when administered together with tenormin. In patients with coronary artery disease, abruptly stopping tenormin can suddenly worsen angina, and occasionally precipitate heart attacks. If it is necessary to discontinue tenormin, its dosage can be reduced gradually over several weeks. Tenormin can mask the early warning symptoms of low blood sugar (hypoglycemia), and should be used with caution in patients receiving treatment for diabetes. It is not habit forming.
Do not take this medicine if you have had an allergic reaction to it or are allergic to any ingredient in this product. Do not stop taking this medicine without checking with your doctor. Some conditions may become worse when the medicine is suddenly stopped. Your dose may need to be slowly lowered to avoid side effects. Keep all doctor and laboratory appointments while you are taking this medicine. Before you have any medical or dental treatments, emergency care, or surgery, tell the doctor or dentist that you are using this medicine. This medicine may cause drowsiness or dizziness. Do not drive, operate machinery, or do anything else that could be dangerous until you know how you react to this medicine. Before having any allergy tests or shots, tell your doctor that you are using this medicine. This medicine may increase your risk for a serious reaction to the allergy shot. Before taking any new medicine, either prescription or over-the-counter, check with your doctor or pharmacist. This includes any medicines used to treat colds or congestion. Caution is advised when using this medicine in the elderly because they may be more sensitive to the effects of this medicine. For women: this medicine has been shown to cause harm to the human fetus. If you plan on becoming pregnant, discuss with your doctor the benefits and risks of using this medicine during pregnancy. This medicine is excreted in breast milk. if you are or will be breast-feeding while you are using this medicine, check with your doctor or pharmacist to discuss the risks to your baby. For patients with diabetes mellitus: this medicine may mask signs of low blood sugar such as a rapid heart rate. Check blood glucose levels regularly.
What is atenolol?
Atenolol is in a group of drugs called beta-blockers. Beta-blockers affect the heart and circulation (blood flow through arteries and veins).
Atenolol is used to treat angina (chest pain) and hypertension (high blood pressure). It is also used to treat or prevent heart attack.
Atenolol may also be used for purposes other than those listed in this medication guide.
What is the most important information I should know about atenolol?
Do not stop taking atenolol 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 atenolol. Be sure the surgeon knows ahead of time that you are using atenolol.
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.
Store atenolol at room temperature away from moisture and heat.
What should I discuss with my healthcare provider before taking atenolol?
You should not use this medication if you are allergic to atenolol, or if you have certain heart conditions such as slow heartbeats, or heart block.
Before taking atenolol, tell your doctor if you have:
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asthma, bronchitis, emphysema;
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diabetes;
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low blood pressure;
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a heart problem such as heart block, sick sinus syndrome, slow heart rate, or congestive heart failure;
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depression;
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liver or kidney disease;
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a thyroid disorder;
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myasthenia gravis;
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pheochromocytoma; or
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problems with circulation (such as Raynaud's syndrome).
If you have any of these conditions, you may need a dose adjustment or special tests to safely take this medication.
FDA pregnancy category D. This medication can cause harm to an unborn baby. Do not use atenolol if you are pregnant. Tell your doctor if you become pregnant during treatment. Use an effective form of birth control while you are using this medication. Atenolol 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 atenolol?
Take atenolol exactly as it was prescribed for you. Do not take the medication in larger amounts or for longer than recommended by your doctor. Follow the directions on your prescription label.
Take this medication with a full glass of water.
Take atenolol at the same time every day.
Do not skip doses or stop taking atenolol 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. Do not miss any visits to your doctor.
If you need to have any type of surgery, tell the surgeon that you are using atenolol. You may need to briefly stop using atenolol before having surgery.
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.
Store atenolol 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 8 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.
Overdose symptoms may include uneven heartbeats, shortness of breath, bluish-colored fingernails, dizziness, weakness, fainting, or seizure (convulsions).
What should I avoid while taking atenolol?
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 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:
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slow or uneven heartbeats;
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feeling light-headed, fainting;
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feeling short of breath, even with mild exertion;
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swelling of your ankles or feet;
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nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes);
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depression; or
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cold feeling in your hands and feet.
Less serious side effects may include:
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decreased sex drive, impotence, or difficulty having an orgasm;
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sleep problems (insomnia);
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tired feeling; or
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anxiety, nervousness.
This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.
What other drugs will affect atenolol?
Before taking atenolol, tell your doctor if you are using:
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allergy treatments (or if you are undergoing allergy skin-testing);
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amiodarone (Cordarone, Pacerone);
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clonidine (Catapres);
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digoxin (digitalis, Lanoxin);
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disopyramide (Norpace);
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guanabenz (Wytensin);
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an MAO inhibitor such as isocarboxazid (Marplan), tranylcypromine (Parnate), phenelzine (Nardil), or selegiline (Eldepryl, Emsam);
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a diabetes medication such as insulin, glyburide (Diabeta, Micronase, Glynase), glipizide (Glucotrol), chlorpropamide (Diabinese), or metformin (Glucophage);
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a heart medication such as nifedipine (Procardia, Adalat), reserpine (Serpasil), verapamil (Calan, Verelan, Isoptin), diltiazem (Cartia, Cardizem);
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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); or
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cold medicines, stimulant medicines, or diet pills.
This list is not complete and there may be other drugs that can interact with atenolol. 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 can provide more information about atenolol.
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