How do you take Atenolol?

Most adults start with one 50 mg tablet taken once a day. Your doctor may increase this to 100 mg once daily depending on how your body responds. Swallow the tablet whole with water — you can take it with or without food, but try to take it at the same time every day, preferably in the morning. Do not stop taking it suddenly without your doctor's advice, as this can be dangerous.

What are the side effects of Atenolol?

Feeling tired or weak, cold hands and feet, dizziness or lightheadedness, slow heartbeat, mild nausea or stomach upset

Who should not take Atenolol?

People with asthma or severe breathing problems, people with very slow heartbeat or heart block, people with very low blood pressure, people with untreated heart failure, people with a known allergy to Atenolol, and people with a condition called pheochromocytoma (a rare adrenal gland tumour) unless already on other specific treatment.

Prescription

Beta-blocker (Heart and blood pressure medicine)

Atenolol

Q: What is Atenolol used for?

High blood pressure (hypertension), chest pain (angina), irregular or fast heartbeat, prevention of future heart attacks

Last reviewed June 2026

Who is this for?

What is this drug?

Atenolol is a heart and blood pressure medicine that works by slowing down your heart rate and relaxing your blood vessels, making it easier for your heart to pump blood around your body.

What is it used for?

High blood pressure (hypertension)chest pain (angina)irregular or fast heartbeatprevention of future heart attacks

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High Blood Pressure Heart Conditions Heart Failure

How it works

Blocks beta-1 adrenergic receptors in the heart and blood vessels, reducing heart rate, cardiac contractility, and blood pressure while decreasing myocardial oxygen demand. This selective beta-blockade also stabilizes cardiac electrical activity, reducing arrhythmias and anginal episodes.

Prescription Required

You need a doctor's prescription to buy this drug.

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What to watch out for

Do not stop taking Atenolol suddenly — stopping abruptly can cause a dangerous spike in blood pressure or trigger chest pain, so always reduce the dose gradually with your doctor's guidance. Buy only from registered pharmacies and look out for Nigerian brands like Synormin, Eden Atenolol, Pocco Atenolol, or Atenomel — avoid unregistered roadside sellers. This is a long-term medication, so keep taking it even if you feel fine, because high blood pressure often has no symptoms.

Common Side Effects

Feeling tired or weak
cold hands and feet
dizziness or lightheadedness
slow heartbeat
mild nausea or stomach upset

Serious Side Effects

Very slow or irregular heartbeat with fainting or severe dizziness — go to the hospital immediately. Sudden difficulty breathing or wheezing
especially if you have asthma. Swelling of the face
lips
or throat which may indicate a serious allergic reaction.

Drug Interactions

Avoid drinking alcohol while on Atenolol as it can make dizziness and low blood pressure worse. Be careful if you are also taking other blood pressure medicines like Amlodipine or Nifedipine, as combining them can cause your blood pressure to drop too low. If you are using diabetes medicines like Metformin or insulin, Atenolol can hide the signs of low blood sugar (like fast heartbeat), so monitor your sugar levels closely.

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Pregnancy & Breastfeeding Warning

Atenolol is not safe during pregnancy as it can harm the unborn baby and affect its growth — it can also pass into breast milk, so consult your doctor before using it if you are pregnant, planning to get pregnant, or breastfeeding.

Who Should NOT Take This

People with asthma or severe breathing problems
people with very slow heartbeat or heart block
people with very low blood pressure
people with untreated heart failure
people with a known allergy to Atenolol
and people with a condition called pheochromocytoma (a rare adrenal gland tumour) unless already on other specific treatment.

How to Store

Store in a cool, dry place away from direct sunlight and heat — Nigerian weather can be hot, so avoid leaving it near windows, in your car, or in humid bathrooms. Keep the tablets in their original pack and far away from children.

For information only — not medical advice. Always talk to a doctor or pharmacist before changing your medication.