Tenormin (Oral)

Atenolol is used on its own or with other medicines (like hydrochlorothiazide) to treat high blood pressure (hypertension). High blood pressure increases the workload on the heart and arteries. If it lasts a long time, the heart and arteries may not work properly. This can harm the blood vessels in the brain, heart, and kidneys, leading to a stroke, heart failure, or kidney failure. High blood pressure may also raise the risk of heart attacks. Controlling blood pressure may help reduce the chances of these problems.

Atenolol is also used to help prevent chest pain and to lessen the severity of heart attacks.

This medicine is a beta-blocker. It works by changing how the body responds to nerve signals in certain areas, such as the heart. As a result, the heart beats more slowly and lowers blood pressure. When blood pressure is reduced, more blood and oxygen reach the heart.

This medicine is available only with your doctor's prescription.

It is very important that your doctor check your progress at regular visits to make sure this medicine is working properly and to check for unwanted effects.

Using this medicine while you are pregnant can harm your unborn baby. Use an effective form of birth control to avoid getting pregnant. If you think you have become pregnant while using the medicine, tell your doctor right away.

Make sure any doctor or dentist who treats you knows that you are using this medicine. You may need to stop using this medicine several days before having surgery.

Atenolol may cause heart failure in some patients. Check with your doctor right away if you are having chest pain or discomfort; dilated neck veins; extreme fatigue; irregular breathing; an irregular heartbeat; shortness of breath; swelling of the face, fingers, feet, or lower legs; weight gain; or wheezing.

This medicine may cause changes in your blood sugar levels. Also, this medicine may hide signs of low blood sugar, such as a rapid pulse rate. Check with your doctor if you have these problems or if you notice a change in the results of your blood or urine sugar tests.

This medicine may cause some people to become less alert than they usually are. If this side effect occurs, do not drive, use machines, or do anything else that could be dangerous if you are not alert while taking atenolol.

In deciding to use a medicine, the risks of taking the medicine must be weighed against the benefits it will provide. This is a decision you and your doctor will make together. For this medicine, consider the following:

Allergies

Tell your doctor if you have ever had any unusual or allergic reaction to this medicine or any other medicines. Also inform your healthcare professional about any other types of allergies you may have, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.

Pediatric

Appropriate studies have not been performed on the relationship of age to the effects of atenolol in children. Safety and efficacy have not been established.

Geriatric

Appropriate studies performed to date have not shown geriatrics-specific problems that would limit the usefulness of atenolol in older adults. However, older patients are more likely to have age-related liver, kidney, or heart issues, which may require caution and an adjustment of dosage in patients taking atenolol.

Breast Feeding

There are no adequate studies in women to determine the risk to infants when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.

Interactions with Medicines

While some medicines should not be used together, in other situations, two different medicines may be used together even if an interaction might happen. In these cases, your doctor may want to adjust the dose, or other precautions may be necessary. When you are taking this medicine, it is especially important that your healthcare professional knows if you are taking any of the medicines listed below. The following interactions have been chosen based on their potential significance and are not necessarily all-inclusive.

Using this medicine with any of the following medicines is usually not recommended, but may be necessary in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you take one or both of the medicines.

• Albuterol
• Ceritinib
• Clonidine
• Crizotinib
• Darunavir
• Diltiazem
• Dronedarone
• Fenoldopam
• Fexinidazole
• Fingolimod
• Formoterol
• Indacaterol
• Iohexol
• Lacosamide
• Levalbuterol
• Olodaterol
• Ponesimod
• Rivastigmine
• Salmeterol
• Siponimod
• Terbutaline
• Verapamil
• Vilanterol

Using this medicine with any of the following medicines may increase the risk of specific side effects, but using both drugs may be the best treatment for you. If both medicines are prescribed together, your doctor may change the dose or how often you take one or both of the medicines.

• Acarbose
• Aceclofenac
• Acemetacin
• Acetyldigoxin
• Albiglutide
• Alfuzosin
• Alogliptin
• Amtolmetin Guacil
• Aspirin
• Bromfenac
• Bufexamac
• Bunazosin
• Canagliflozin
• Celecoxib
• Chlorpropamide
• Choline Salicylate
• Clonixin
• Dapagliflozin
• Deslanoside
• Dexibuprofen
• Dexketoprofen
• Diclofenac
• Diflunisal
• Digitoxin
• Digoxin
• Dipyrone
• Disopyramide
• Doxazosin
• Droxicam
• Dulaglutide
• Empagliflozin
• Ertugliflozin
• Etodolac
• Etofenamate
• Etoricoxib
• Exenatide
• Felbinac
• Fenoprofen
• Fepradinol
• Feprazone
• Floctafenine
• Flufenamic Acid
• Flurbiprofen
• Glimepiride
• Glipizide
• Glyburide
• Ibuprofen
• Indomethacin
• Insulin Aspart, Recombinant
• Insulin Degludec
• Insulin Detemir
• Insulin Glargine, Recombinant
• Insulin Glulisine
• Insulin Human Inhaled
• Insulin Human Isophane (NPH)
• Insulin Human Regular
• Insulin Lispro, Recombinant
• Ketoprofen
• Ketorolac
• Linagliptin
• Liraglutide
• Lixisenatide
• Lornoxicam
• Loxoprofen
• Lumiracoxib
• Meclofenamate
• Mefenamic Acid
• Meloxicam
• Metformin
• Metildigoxin
• Miglitol
• Morniflumate
• Moxisylyte
• Nabumetone
• Naproxen
• Nateglinide
• Nepafenac
• Niflumic Acid
• Nimesulide
• Nimesulide Beta Cyclodextrin
• Oxaprozin
• Oxyphenbutazone
• Parecoxib
• Phenoxybenzamine
• Phentolamine
• Phenylbutazone
• Piketoprofen
• Pioglitazone
• Piroxicam
• Pramlintide
• Pranoprofen
• Prazosin
• Proglumetacin
• Propyphenazone
• Proquazone
• Quinidine
• Repaglinide
• Rofecoxib
• Rosiglitazone
• Salicylic Acid
• Salsalate
• Saxagliptin
• Sitagliptin
• Sodium Salicylate
• St John's Wort
• Sulindac
• Tamsulosin
• Tenoxicam
• Terazosin
• Tiaprofenic Acid
• Tolazamide
• Tolbutamide
• Tolfenamic Acid
• Tolmetin
• Trimazosin
• Urapidil
• Valdecoxib
• Vildagliptin

Interactions with Food/Tobacco/Alcohol

Some medicines should not be used at or around the time of eating food or certain types of food due to potential interactions. Using alcohol or tobacco with some medicines may also cause interactions. Discuss with your healthcare professional about using your medicine with food, alcohol, or tobacco.

Other Medical Problems

Having other medical issues may affect the use of this medicine. Make sure to inform your doctor if you have any other medical problems, especially:

• Bradycardia (slow heartbeat) or
• Heart block or
• Heart failure or
• Pheochromocytoma (untreated adrenal gland tumor)—Should not use in patients with these conditions.

• Diabetes or
• Hyperthyroidism (overactive thyroid) or
• Hypoglycemia (low blood sugar)—May hide some signs and symptoms of these conditions, such as a fast heartbeat.

• Kidney disease—Use with caution. The effects may be stronger because of slower removal from the body.

• Lung disease (e.g., asthma, bronchitis, emphysema)—May cause difficulty breathing in patients with this condition.

Along with its needed effects, a medicine may cause some unwanted effects. Not all of these side effects may occur, but if they do, they may need medical attention.

Check with your doctor immediately if any of the following side effects occur:

More common

• Blurred vision
• cold hands or feet
• confusion
• difficult or labored breathing
• dizziness, faintness, or lightheadedness when getting up from a lying or sitting position suddenly
• shortness of breath
• sweating
• tightness in chest
• unusual tiredness or weakness
• wheezing

Less common

• Anxiety
• chest pain or discomfort
• chills
• cold sweats
• cough
• dizziness or lightheadedness
• fainting
• fast heartbeat
• leg pain
• noisy breathing
• slow or irregular heartbeat
• sudden shortness of breath or troubled breathing

Rare

• Bloody urine
• decreased frequency or amount of urine
• increased blood pressure
• increased thirst
• loss of appetite
• lower back or side pain
• nausea
• swelling of face, fingers, or lower legs
• vomiting
• weight gain

Incidence not determined

• Black, tarry stools
• bleeding gums
• blood in urine or stools
• blurred or loss of vision
• bone or joint pain
• disturbed color perception
• double vision
• feeling that others are watching you or controlling your behavior
• feeling that others can hear your thoughts
• feeling, seeing, or hearing things that are not there
• fever
• halos around lights
• night blindness
• overbright appearance of lights
• paleness or cold feeling in fingertips and toes
• pinpoint red or purple spots on skin
• severe mood or mental changes
• skin irritation or rash, including rash that looks like psoriasis
• skin rash, hives, or itching
• sore throat
• swollen or painful glands
• tingling or pain in fingers or toes when exposed to cold
• tunnel vision
• unusual behavior
• unusual bleeding or bruising

Get emergency help immediately if any of the following symptoms of overdose occur:

Symptoms of overdose

• Anxiety
• coma
• cool, pale skin
• depression
• dilated neck veins
• extreme fatigue
• headache
• increased hunger
• irregular breathing
• nervousness
• nightmares
• seizures
• shakiness
• slurred speech
• unusual drowsiness, dullness, tiredness, weakness, or feeling of sluggishness

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. 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, are bothersome, or if you have any questions about them:

More common

• Discouragement
• feeling sad or empty
• irritability
• lack of appetite
• loss of interest or pleasure
• trouble concentrating
• trouble sleeping

Less common

• Diarrhea
• dream activity
• feeling of constant movement of self or surroundings
• sensation of spinning
• sleepiness

Incidence not determined

• Decreased interest in sexual intercourse
• dry mouth
• inability to have or keep an erection
• loss in sexual ability, desire, drive, or performance
• loss of hair, temporary
• pain of penis on erection

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

In the U.S.

• Tenormin

Available Dosage Forms:

• Tablet

Therapeutic Class: Cardiovascular Agent

Pharmacologic Class: Beta-Adrenergic Blocker, Cardioselective

In addition to the use of this medicine, treatment for your high blood pressure may include weight control and changes in the types of foods you eat, especially foods high in sodium. Your doctor will tell you which of these are most important for you. You should check with your doctor before changing your diet.

Many patients who have high blood pressure will not notice any signs of the problem. In fact, many may feel normal. It is very important that you take your medicine exactly as directed and that you keep your appointments with your doctor even if you feel well.

Remember that this medicine will not cure your high blood pressure, but it does help control it. You must continue to take it as directed if you expect to lower your blood pressure and keep it down. You may have to take high blood pressure medicine for the rest of your life. If high blood pressure is not treated, it can cause serious problems such as heart failure, blood vessel disease, stroke, or kidney disease.

Do not interrupt or stop taking this medicine without first checking with your doctor. Your doctor may want you to gradually reduce the amount you are taking before stopping it completely. Some conditions may become worse when the medicine is stopped suddenly, which can be dangerous.

Dosing

The dose of this medicine will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of this medicine. If your dose is different, do not change it unless your doctor tells you to do so.

The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.

• For oral dosage form (tablets): For acute heart attack: Adults—50 milligrams (mg) ten minutes after the last intravenous (IV) dose followed by another 50 mg twelve hours later. Then, 100 mg once a day or 50 mg two times a day for another 6 to 9 days or until discharge from the hospital. Children—Use and dose must be determined by your doctor. For chest pain: Adults—At first, 50 milligrams (mg) once a day. Your doctor may increase your dose if needed. Children—Use and dose must be determined by your doctor. For high blood pressure: Adults—At first, 50 milligrams (mg) once a day. Your doctor may increase your dose if needed. Children—Use and dose must be determined by your doctor.

Missed Dose

If you miss a dose of this medicine, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses.

Storage

Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.

Keep out of the reach of children.

Do not keep outdated medicine or medicine no longer needed.

Ask your healthcare professional how you should dispose of any medicine you do not use.

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