# Atenolol in Nigeria

Atenolol has 11 active NAFDAC registrations in our October 2026 copy of the register, from 7 registration holders; 9 further listings have lapsed.

- Source: https://ogbogwu.com/drugs/atenolol/
- Drug class: Beta-1 selective adrenergic blocker (Hypertension)
- Also known as: Tenormin, Blokium
- Prescription required: yes
- On the WHO Model List of Essential Medicines
- Last updated: October 2026

## Price in Nigeria

As of October 2026, Atenolol sells for about ₦3,150 online in Nigeria (₦1,750–₦3,500) at HealthPlus and MedPlus. The online price is roughly unchanged since July 2026. Open-market prices (e.g. Idumota, Ogbogwu) are often lower.

## What is Atenolol?

Atenolol is a beta-blocker, one of the oldest and most widely used classes of blood pressure medications available in Nigeria. It belongs to the beta-1 selective subgroup, meaning it primarily targets the beta-1 receptors found in the heart. By blocking these receptors, atenolol slows down the heart rate, reduces the force of heart contractions, and lowers blood pressure. It has been a staple in Nigerian pharmacies for decades, and its affordability makes it accessible to a wide range of patients. Hypertension is estimated to affect 30-45% of Nigerian adults, and many of these individuals remain undiagnosed because the condition rarely produces noticeable symptoms until complications such as stroke, heart failure, or kidney disease occur.

While current international treatment guidelines no longer recommend beta-blockers as first-line therapy for uncomplicated hypertension — with calcium channel blockers like amlodipine and thiazide diuretics being preferred, especially in Black and African patients — atenolol remains very widely prescribed in Nigeria. This is partly due to its long track record, its low cost, and its usefulness in patients who have both hypertension and a fast heart rate (tachycardia). Atenolol is also valuable for patients with angina (chest pain caused by reduced blood flow to the heart), anxiety-related palpitations, and for the prevention of migraine headaches. It effectively controls the heart rate, which makes patients feel calmer and reduces the sensation of a racing or pounding heart.

Atenolol is available in Nigeria under several brand names including Tenormin (AstraZeneca, the original brand), alongside generic atenolol tablets. It is taken once or twice daily depending on the condition being treated and the prescribed dose. All legitimate brands carry NAFDAC registration numbers. While atenolol is generally well tolerated, it has important side effects and precautions — particularly the warning that it should NEVER be stopped suddenly, as this can cause a dangerous rebound increase in heart rate and blood pressure.

## What is Atenolol used for?

- Treatment of hypertension (high blood pressure) — although no longer first-line in current guidelines, it remains widely used in Nigeria, especially when patients also have a fast heart rate
- Management of angina pectoris (chest pain caused by reduced blood supply to the heart) — atenolol reduces the heart's oxygen demand
- Heart rate control — used to slow down a fast heart rate in various conditions including atrial fibrillation and supraventricular tachycardia
- Relief of anxiety-related palpitations and performance anxiety — atenolol blocks the physical symptoms of anxiety such as rapid heartbeat, trembling, and sweating
- Prevention of migraine headaches — used as a preventive (prophylactic) treatment to reduce the frequency and severity of migraines
- Post-heart attack treatment — to reduce the risk of further cardiac events

## Dosage

Always follow a doctor's or pharmacist's instructions; this is general reference information.

- Adults: For hypertension: the usual starting dose is 25mg to 50mg taken once daily. The dose may be increased to 100mg once daily if blood pressure is not adequately controlled. The maximum recommended dose for hypertension is 100mg per day. For angina: 50mg to 100mg once daily. For heart rate control: dosing depends on the specific condition and is determined by the doctor. Take atenolol at the same time each day, preferably in the morning, with or without food. Swallow the tablet whole with water.
- Children: Atenolol may be used in children for certain heart conditions at a dose of 0.5mg to 1mg per kg body weight per day, given as a single daily dose. Paediatric dosing should always be determined by a specialist doctor. It is not commonly prescribed for children with uncomplicated hypertension.
- Elderly: Elderly patients may require a lower starting dose of 25mg once daily due to reduced kidney function and increased sensitivity to the drug's heart rate-lowering effects. Dose adjustments should be made gradually with careful monitoring.

CRITICAL WARNING: Do NOT stop taking atenolol suddenly. Abrupt discontinuation of beta-blockers can cause a dangerous rebound effect — your heart rate may surge and blood pressure can spike dramatically, potentially triggering a heart attack or severe hypertensive crisis. If your doctor decides to stop atenolol, the dose will be reduced gradually over 1-2 weeks. Always take atenolol as prescribed, even when you feel well. If you miss a dose, take it as soon as you remember unless it is almost time for your next dose — never take a double dose.

## Side effects

Common: Fatigue and tiredness — this is one of the most frequently reported side effects and may affect your energy levels for daily activities; Cold hands and feet — caused by reduced blood flow to the extremities; Slow heart rate (bradycardia) — the heart rate may drop below 60 beats per minute, which is usually not dangerous but should be monitored; Dizziness or lightheadedness, especially when standing up; Nausea or stomach upset; Sleep disturbances, including vivid dreams or difficulty sleeping; Mild depression or low mood in some patients.

Serious (seek medical help immediately): Severely slow heart rate (below 50 beats per minute) — may cause fainting, extreme dizziness, or shortness of breath and requires immediate medical attention; Worsening of asthma or chronic obstructive pulmonary disease (COPD) — atenolol can trigger bronchospasm (tightening of the airways) in susceptible patients; Heart failure symptoms — including increasing shortness of breath, ankle swelling, and inability to lie flat; Severe hypotension (very low blood pressure) — causing fainting or shock; Masking of hypoglycaemia symptoms in diabetic patients — atenolol can hide the warning signs (such as rapid heartbeat and trembling) of low blood sugar, making it dangerous for patients on insulin or sulfonylureas; Rebound hypertension and tachycardia if stopped suddenly — potentially life-threatening.

When to see a doctor: See your doctor promptly if you experience extreme tiredness that interferes with daily activities, a very slow pulse (below 50 beats per minute), cold or numb fingers and toes, worsening shortness of breath, or symptoms of depression. Seek EMERGENCY medical attention if you develop severe breathing difficulty (especially if you have asthma or COPD), fainting, chest pain, or if you have accidentally stopped the medication suddenly and are experiencing a racing heart or very high blood pressure. Diabetic patients should be especially vigilant about monitoring blood sugar levels while on atenolol.

## Warnings

Do not take if: Do not use in patients with uncontrolled heart failure — atenolol can worsen the condition; it should only be used in heart failure under specialist supervision after the patient has been stabilised; Do not use in patients with severe bradycardia (very slow heart rate below 50 beats per minute) or heart block (second or third degree); CAUTION in patients with asthma or COPD — atenolol can trigger bronchospasm; although it is beta-1 selective, this selectivity is not absolute, and respiratory problems can still occur. If a beta-blocker is absolutely necessary, use under close medical supervision; Do not use in patients with untreated phaeochromocytoma (a rare adrenal gland tumour); Use with caution in patients with peripheral vascular disease (poor circulation to the limbs) — atenolol can worsen symptoms; Use with caution in patients with diabetes — atenolol can mask the symptoms of hypoglycaemia (low blood sugar).

Interactions: Verapamil and diltiazem (non-dihydropyridine calcium channel blockers) — combining with atenolol can cause severely slow heart rate and dangerously low blood pressure; this combination should generally be avoided; Digoxin — both drugs slow the heart rate, and combining them can cause excessive bradycardia; Clonidine — if both drugs are being used and need to be stopped, atenolol should be discontinued first, several days before stopping clonidine, to avoid rebound hypertension; NSAIDs (such as ibuprofen and diclofenac) — can reduce the blood pressure-lowering effect of atenolol; Insulin and oral diabetes medications — atenolol can enhance the blood sugar-lowering effect and mask hypoglycaemia symptoms; more frequent blood sugar monitoring is needed; Other blood pressure-lowering medications — combining may cause blood pressure to drop too low; dose adjustments may be necessary.

Pregnancy & breastfeeding: Atenolol is generally NOT recommended during pregnancy. It has been associated with intrauterine growth restriction (small babies), low birth weight, and low blood sugar in newborns. If you are pregnant or planning to become pregnant, your doctor should switch you to a safer antihypertensive such as methyldopa or labetalol (a different beta-blocker with a better safety profile in pregnancy). Atenolol passes into breast milk in significant amounts and may cause slow heart rate and low blood sugar in the breastfeeding infant. It is generally not recommended during breastfeeding. Consult your doctor for safer alternatives.

## Brands in Nigeria

Well-known NAFDAC-registered brands: Tenormin (AstraZeneca, made in UK).
Full searchable brand list: https://ogbogwu.com/drugs/atenolol/brands/

## How to verify it is genuine

1. Check the NAFDAC registration number on the packaging — all genuine atenolol brands sold in Nigeria must display a valid NAFDAC number (e.g., A4-XXXX or B4-XXXX format)
2. Verify the NAFDAC number using the NAFDAC Green Book or the NAFDAC mobile verification app available on Android and iOS
3. Purchase only from licensed pharmacies and registered patent medicine stores — avoid buying from unregistered vendors, open markets, or bus stops
4. Check the expiry date and ensure the packaging is properly sealed with no evidence of tampering or moisture damage
5. Genuine tablets should have a consistent size, shape, colour, and markings. If tablets appear uneven, crumbly, discoloured, or have an unusual smell, do not use them
6. For imported brands like Tenormin, verify the distinctive tablet markings (usually embossed with the strength). For Emzor products, check for holographic security features and proper batch numbering

Verify any NAFDAC number free (no login): https://ogbogwu.com/nafdac-checker/

## FAQs

### Can atenolol be used for anxiety?

While atenolol is not officially approved as an anti-anxiety medication, it is sometimes prescribed off-label to manage the physical symptoms of anxiety, particularly performance anxiety and anxiety-related palpitations. Atenolol blocks the effects of adrenaline on the heart, which reduces rapid heartbeat, trembling, and sweating — the physical symptoms that many anxious people find most distressing. Some doctors in Nigeria prescribe low-dose atenolol (25mg) for patients who experience palpitations triggered by anxiety or stress. However, it is important to understand that atenolol does not treat the psychological aspects of anxiety. If you have significant anxiety, you should seek comprehensive treatment that may include counselling or other appropriate medications. Never self-medicate with atenolol for anxiety — always consult a doctor.

### Why might my doctor switch me from atenolol to another blood pressure drug?

There are several reasons your doctor may decide to switch you from atenolol to another antihypertensive medication. Current international and Nigerian treatment guidelines now prefer calcium channel blockers (like amlodipine) or thiazide diuretics as first-line therapy for uncomplicated hypertension, especially in Black and African patients, based on evidence showing superior outcomes. Your doctor may also switch you if atenolol is causing bothersome side effects such as excessive fatigue, cold extremities, depression, or sexual dysfunction. Other reasons include: if you develop asthma or worsening lung disease, if your blood pressure is not adequately controlled, or if you develop diabetes (since atenolol can mask low blood sugar symptoms and may affect blood sugar control). Whatever the reason, NEVER stop atenolol on your own — your doctor will gradually reduce the dose over 1-2 weeks to prevent dangerous rebound effects.

### Is atenolol safe for diabetic patients?

Atenolol can be used in diabetic patients, but with important cautions. The main concern is that atenolol can mask the typical warning symptoms of hypoglycaemia (low blood sugar), such as rapid heartbeat, trembling, and anxiety. This means a diabetic patient on atenolol might not recognise when their blood sugar has dropped dangerously low, which can be very dangerous. Sweating, another hypoglycaemia symptom, is usually NOT masked by beta-blockers and may be the only warning sign. If you have diabetes and are taking atenolol, you should monitor your blood sugar more frequently and be aware that your usual hypoglycaemia warning signs may be blunted. Some doctors prefer to use other antihypertensives — such as ACE inhibitors (lisinopril) or ARBs (losartan) — in diabetic patients because these drug classes also protect the kidneys. Discuss with your doctor which option is best for your specific situation.

## Sources

- NAFDAC Greenbook (official register of approved products in Nigeria)
- WHO Model List of Essential Medicines
- British National Formulary (BNF)
- Nigerian Standard Treatment Guidelines (Federal Ministry of Health)