Drug Class: Cardioselective Beta-1 Adrenergic Receptor Blocker | Form: Oral Tablet | Prescription Status: Prescription Only (Rx) — DRAP Registered
What is Blokium 50mg Tablet? Blokium 50mg contains Atenolol 50mg — the standard starting and maintenance dose for most adults requiring beta-blocker therapy for hypertension, angina, arrhythmias, and post-myocardial infarction cardioprotection. At this dose Atenolol delivers clinically meaningful once-daily heart rate reduction, blood pressure lowering, and cardiac workload reduction with a well-established tolerability profile built over decades of widespread clinical use. Its cardioselectivity provides cardiovascular benefits with relatively less impact on bronchial airways and peripheral vasculature compared to non-selective beta-blockers — though this selectivity is not absolute and caution remains essential in respiratory conditions. Blokium 50mg is a long-term medicine requiring consistent daily use and must never be stopped suddenly under any circumstances.
What is Blokium 50mg Used For?
- Hypertension — standard maintenance dose for blood pressure management (ہائی بلڈ پریشر)
- Chronic stable angina — prevention and reduction of chest pain frequency and severity (سینے کے درد کی روک تھام)
- Cardiac arrhythmias — rate control in supraventricular tachycardia and atrial fibrillation (دل کی بے قاعدہ اور تیز دھڑکن)
- Post-myocardial infarction — long-term mortality reduction after heart attack (دل کے دورے کے بعد طویل مدتی تحفظ)
- Hypertension with tachycardia — combined elevated blood pressure and rapid heart rate management
- Migraine prophylaxis — prevention of frequent migraine headaches under neurologist supervision (آدھے سر کے درد کی روک تھام)
How Does it Work? Atenolol selectively blocks beta-1 adrenergic receptors in the heart — reducing heart rate, decreasing force of cardiac contraction, lowering cardiac output, and reducing myocardial oxygen demand. At 50mg this cardioselective blockade provides the standard therapeutic level for most patients — delivering effective once-daily cardiovascular protection with an acceptable side effect profile. For angina, reduced heart rate and cardiac workload decreases myocardial oxygen consumption — preventing the supply-demand mismatch that causes ischaemic chest pain. For arrhythmias, slowed atrioventricular node conduction provides effective rate control. Post-infarction, sustained beta-1 blockade reduces the risk of fatal arrhythmias and reinfarction through cardiac stabilisation and anti-remodelling effects.
Dosage and Administration
⚠️ Never stop suddenly — abrupt discontinuation causes dangerous rebound hypertension and can trigger severe unstable angina or life-threatening heart attack. Always reduce dose gradually over several weeks under cardiologist supervision. Take at the same time each day. Monitor heart rate and blood pressure regularly throughout treatment.
| Indication | Usual Adult Dose | Frequency | Notes |
|---|---|---|---|
| Hypertension | 50mg | Once daily | Increase to 100mg if needed after 4 weeks |
| Chronic stable angina | 50 – 100mg | Once daily | Adjusted to heart rate response |
| Cardiac arrhythmias | 50 – 100mg | Once daily | Under specialist supervision |
| Post-myocardial infarction | 50mg | Twice daily initially then once daily | Long-term cardioprotection |
| Migraine prophylaxis | 50 – 100mg | Once daily | Under neurologist supervision |
Active Ingredients
| Ingredient | Strength |
|---|---|
| Atenolol | 50mg |
Who Should NOT Take Blokium 50mg?
- Allergy to Atenolol or any beta-blocker
- Severe bradycardia — resting heart rate below 60 beats per minute
- Cardiogenic shock or decompensated heart failure
- Second or third degree heart block without a functioning pacemaker
- Sick sinus syndrome without a pacemaker
- Severe asthma or chronic obstructive pulmonary disease — risk of life-threatening bronchospasm
- Severe peripheral artery disease — significant claudication or critical limb ischaemia
- Severe kidney impairment — Atenolol accumulates; dose reduction to 25mg required
- Phaeochromocytoma without prior alpha-blocker cover
- Metabolic acidosis
- Pregnancy and breastfeeding — consult cardiologist before use
- Children under 18 years
Side Effects
Common: Fatigue and tiredness (تھکاوٹ), slow heart rate (دل کی دھڑکن کا سست ہونا), dizziness especially on standing, cold hands and feet, mild headache, mild sleep disturbances, mild nausea, mild depression — most effects are manageable and reduce with continued use as the body adjusts.
Serious — Stop and seek emergency help immediately: Severely slow heart rate below 50 beats per minute with dizziness or fainting (دل کی دھڑکن بہت سست — فوری ہسپتال جائیں), sudden severe worsening of chest pain — extremely dangerous if Blokium stopped abruptly (فوری مدد لیں), significant worsening of heart failure — sudden breathlessness with rapid unexplained weight gain and severe ankle swelling (فوری ہسپتال جائیں), significant worsening of asthma or bronchospasm after taking tablet (فوری مدد لیں), severely low blood pressure with fainting (بے ہوشی — فوری مدد لیں), severe allergic reaction with swelling of face or throat, significant worsening of peripheral circulation — severely cold or painful limbs.
Drug Interactions
| Medicine | Interaction |
|---|---|
| Verapamil / Diltiazem | Severely dangerous combination — additive cardiac depression causing heart block and dangerous bradycardia — never combine without strict specialist supervision |
| Antiarrhythmics (Amiodarone, Digoxin) | Additive cardiac conduction slowing — increased heart block and bradycardia risk |
| Other antihypertensives | Additive blood pressure lowering — increased hypotension and dizziness risk |
| NSAIDs (Ibuprofen, Diclofenac) | Reduce antihypertensive effectiveness of Atenolol — avoid regular combined use |
| Antidiabetic medicines (Insulin, oral hypoglycaemics) | Atenolol masks hypoglycaemia warning signs including rapid heartbeat — monitor blood glucose closely |
| Clonidine | Never stop Clonidine abruptly while on Atenolol — severe dangerous rebound hypertension |
| Sympathomimetics (adrenaline, decongestants) | Increased blood pressure and cardiac effects — use with caution |
| Rifampicin | Reduces Atenolol blood levels and antihypertensive effectiveness — monitor blood pressure |
| Anaesthetic agents | Increased cardiovascular depression during surgery — always inform anaesthetist before any procedure |
| Alcohol (شراب) | Increases blood pressure lowering and dizziness — avoid excessive consumption |
Storage: Store below 25°C in a cool, dry place. Protect from moisture and direct sunlight. Keep out of reach of children (بچوں کی پہنچ سے دور رکھیں). Do not use after expiry date.
FAQs
Q: When should Blokium 50mg be increased to the 100mg dose? If blood pressure remains inadequately controlled or angina symptoms persist after 4 weeks of consistent once-daily 50mg use — your cardiologist will assess whether escalation to 100mg is clinically appropriate. Many patients achieve satisfactory long-term cardiovascular control at 50mg without requiring dose escalation.
Q: How does Blokium 50mg reduce mortality after a heart attack? After a heart attack the heart is vulnerable to dangerous arrhythmias and further ischaemic events driven by excess sympathetic nervous system activity. Atenolol's sustained beta-1 blockade stabilises cardiac electrical activity, reduces heart rate and oxygen demand, and prevents the harmful cardiac remodelling that increases mortality risk — producing meaningful long-term survival benefit when started promptly after myocardial infarction.
Q: Can Blokium 50mg be taken by patients with mild controlled asthma? Atenolol is cardioselective — however cardioselectivity is relative and diminishes at higher doses. Even the 50mg dose carries some risk of bronchospasm in asthmatic patients. Patients with mild well-controlled asthma should only use Atenolol under strict respiratory and cardiac specialist co-supervision with a rescue inhaler always available.
Medical Disclaimer: This information is for general awareness only and does not replace medical advice. Always consult a qualified doctor or pharmacist before taking any prescription medicine.