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

Atenolol is a beta-selective adrenoceptor blocker that binds to vascular and heart smooth muscles to inhibit certain interactions with other chemicals that stimulate blood flow. This action allows Tenormin to reduce your blood pressure and heart muscle contractions.

This beta blocker medication is an effective treatment for hypertension and for preventing and managing angina. Tenormin is generally well-tolerated and since it has no partial agonist or membrane stabilizing activity it does not cross the brain threshold barrier, allowing for a lower incidence of adverse events than those that do.

Uses and Dosage

The dose that is prescribed of Tenormin will vary depending on the individual and condition being treated. Follow all your doctor’s directives and read packaging labels carefully to ensure the best results.

  • Swallow tablets whole
  • Take with or without food
  • For hypertension, adults take an initial dose of 50mg once a day alone or with diuretic therapy
  • Doses can increase up to 100mg daily
  • For angina, adults start by taking 50mg once daily and can increase up to 200mg daily
  • Regularly check your blood pressure during treatment
  • Do not suddenly stop taking Tenormin to avoid withdrawal symptoms
  • Store at room temperature away from moisture, heat, and light
  • Keep away from children and pets with the lid tightly closed

Side Effects

Tenormin may cause some side effects to develop while improving blood pressure and easing chest pain. Speak with your doctor for more information regarding any symptoms that you may encounter when taking atenolol.

Common Tenormin side effects:

  • Cold hands or feet
  • Dizziness
  • Tiredness
  • Depressed mood

Serious Side Effects

Some more serious adverse reactions may occur when taking atenolol. Stop using Tenormin and call your doctor right away if you develop any of the following side effects:

  • New or worsening chest pain
  • Slow or uneven heartbeats
  • Light-headed feeling like you might pass out
  • Shortness of breath, swelling, rapid weight gain
  • Cold feeling in your hands and feet

Allergic Reactions

Do not use Tenormin if you are allergic to atenolol. If you notice signs of an allergic reaction, stop taking this medication and contact your doctor.

Tenormin allergy symptoms may include:

  • Hives
  • Difficulty breathing
  • Swelling of face, lips, tongue, or throat


Do not use Tenormin if your heart cannot pump blood properly of if you have slow heartbeats, heart failure, or a serious heart condition like AV block.

Do not suddenly stop taking Tenormin without talking with your doctor because doing so could make your condition worse.

You may need to temporarily stop taking Tenormin if you have surgery. Let the surgeon know you take this medication and follow their instructions.

Atenolol may impair your thinking or reactions. Avoid driving or performing activities that require alertness, especially until you know how this medication will affect you.

Avoid drinking alcohol because it can increase the drowsy and dizzy side effects of Tenormin.

If using Tenormin to treat high blood pressure, continue using the medication as directed even if you feel well. Hypertension often presents no symptoms, and you may need to use medication for the rest of your life.

To ensure your safety when taking Tenormin, tell your doctor if you have ever had any of the following:

  • Congestive heart failure
  • Coronary artery disease
  • Asthma, bronchitis, emphysema
  • Diabetes
  • Overactive thyroid
  • Liver or kidney disease
  • Pheochromocytoma
  • Peripheral vascular disease like Raynaud’s syndrome
  • If you are undergoing any allergy treatment or skin-testing

Atenolol may cause harm to an unborn baby if used during pregnancy. Tell your doctor right away if you are pregnant or if you become pregnant during treatment.

Atenolol may pass into breast milk and cause harm to your nursing baby. Consult with your doctor before breastfeeding while taking Tenormin.

Some other drugs may interact with atenolol and cause adverse reactions. To avoid this, tell your doctor about all the medications that you take, including over the counter medicine, but especially any of the following:

  • Digoxin
  • Indomethacin
  • Another beta-blocker (bisoprolol, carvedilol, labetalol, and more)
  • Heart or blood pressure medications (amiodarone, clonidine, diltiazem, and others)

Tenormin is not an approved treatment for anyone under the age of 18.

Form and Strength

This heart medication is available in tablet form.

Tenormin tablet strengths:

  • 25mg
  • 50mg
  • 100mg

The 25mg Tenormin tablets are available in quantities of 84 and 100 while the 50mg strength tablets are available in groups of 30, 90, or 100 and the 100mg tablets are available in quantities of 84.


When is the best time of day to take Tenormin?

Research has found that any blood pressure medication may be more beneficial when taken at night before bed. This is because it can offer better control of your blood pressure at night without decreasing effectiveness during the day. With Tenormin’s once daily dosing regimen, this can also help counteract some side effects during the day.

What should I check when taking Tenormin?

Your blood pressure should be checked regularly when using Tenormin whether for hypertension or angina. This can help ensure the efficacy and tolerability of the medication, especially since hypertension often presents no noticeable symptoms.



Additional information

Brand Name:


Scientific Name:


Other Names:

Atenolol, Nortan, Tenormin


25mg, 50mg, 100mg

Quantities Available:

30, 84, 90, 100


Film Coated Tablet, Tablet