Tenormin is a beta-blocker that affects the heart and circulation (blood flow through arteries and veins).

Tenormin is used to treat angina (chest pain) and hypertension (high blood pressure).

Tenormin is also used to lower the risk of death after a heart attack.

You should not use Tenormin if you have a serious heart condition such as "AV block," very slow heartbeats, or heart failure.

Do not stop taking Tenormin 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 Tenormin. Be sure the surgeon knows ahead of time that you are using this medicine.

Tenormin 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 Tenormin.

Tenormin 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.

Take Tenormin exactly as it was prescribed for you. Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose.

Your blood pressure will need to be checked often.

If you need surgery, tell the surgeon ahead of time that you are using Tenormin. You may need to stop using the medicine for a short time.

Keep using the medication as directed and tell your doctor if your symptoms do not improve.

You should not stop taking Tenormin 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 Tenormin at room temperature away from moisture, heat, and light. Keep the bottle tightly closed when not in use.

Usual Adult Dose of Tenormin for Hypertension:

Initial dose: 50 mg orally once a day
Maintenance dose: 50 to 100 mg orally once a day
Maximum dose: 100 mg per day

Comments:
-If desired response not achieved after 1 to 2 weeks, increase to 100 mg may be beneficial.
-Doses greater than 100 mg once a day did not result in significant additional antihypertensive effects.

Use: For the treatment of hypertension alone or in combination with other antihypertensive agents.

Usual Adult Dose for Angina Pectoris Prophylaxis:

Initial dose: 50 mg orally once a day
-Increase to 100 mg orally once a day after 1 week if optimal response not achieved
Maintenance dose: 50 to 200 mg orally once a day
Maximum dose: 200 mg per day

Comments:
-Some patients may require 200 mg per day to attain optimal effect.

Use: For the long-term management of angina pectoris due to coronary atherosclerosis.

Usual Adult Dose for Angina Pectoris:

Initial dose: 50 mg orally once a day
-Increase to 100 mg orally once a day after 1 week if optimal response not achieved
Maintenance dose: 50 to 200 mg orally once a day
Maximum dose: 200 mg per day

Comments:
-Some patients may require 200 mg per day to attain optimal effect.

Use: For the long-term management of angina pectoris due to coronary atherosclerosis.

Usual Adult Dose for Myocardial Infarction:

50 mg orally twice a day or 100 mg orally once a day

Comments:
-If IV beta blockers are contraindicated or inappropriate, oral therapy should continue for at least 7 days post-myocardial infarction (MI).
-Treatment with beta blockers post MI should generally continue for 1 to 3 years if there are no contraindications.

Use: For the management of hemodynamically stable patients with definite or suspected acute myocardial infarction to reduce cardiovascular mortality.

Usual Geriatric Dose for Hypertension:

Initial dose: Consider reducing the starting dose to 25 mg orally once a day

You should not use Tenormin if you are allergic to atenolol, or if you have:

• a serious heart condition such as "AV block" (second or third degree);

• slow heartbeats;

• heart failure; or

• if your heart cannot pump blood properly.

To make sure Tenormin is safe for you, tell your doctor if you have ever had:

• congestive heart failure;

• coronary artery disease (hardened arteries);

• 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).

Atenolol may harm an 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 breastfeeding a baby.

Tenormin is not approved for use by anyone younger than 18 years old.

Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time.

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 Tenormin: 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 Tenormin side effects may include include:

• cold hands or feet;

• dizziness;

• tiredness; 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 drug interactions are listed here.