Drug Class: Cardioselective Beta-1 Adrenergic Receptor Blocker | Form: Oral Tablet | Prescription Status: Prescription Only (Rx) — DRAP Registered
What is Blokium 25mg Tablet? Blokium 25mg contains Atenolol 25mg — the lowest available strength specifically indicated for patients requiring cautious initiation of beta-blocker therapy. This includes elderly patients particularly susceptible to excessive bradycardia and hypotension, patients with significant kidney impairment where Atenolol accumulates and requires dose reduction, and patients with heart failure being initiated on beta-blockade where the lowest possible starting dose is clinically essential. Starting at 25mg and titrating upward very slowly allows the cardiovascular system to adapt safely to beta-1 receptor blockade before escalation to standard maintenance doses. Despite the lower dose, Atenolol's once-daily dosing profile still provides meaningful and consistent heart rate and blood pressure reduction throughout the full 24-hour period.
What is Blokium 25mg Used For?
- Hypertension initiation — lowest starting dose for sensitive patients (ہائی بلڈ پریشر کی محتاط ابتدائی خوراک)
- Chronic stable angina — initial dose for patients requiring cautious beta-blocker introduction (سینے کے درد کی روک تھام)
- Cardiac arrhythmias — initial rate control dose under specialist supervision (دل کی بے قاعدہ دھڑکن کا ابتدائی علاج)
- Elderly hypertension — lowest dose for older patients susceptible to bradycardia (بزرگ مریضوں میں ہائی بلڈ پریشر)
- Kidney impairment — dose-reduced Atenolol for patients with reduced renal clearance
- Heart failure initiation — very cautious starting dose under strict cardiologist supervision
- Step-up therapy — initial dose before gradual titration to 50mg or 100mg as tolerated
How Does it Work? Atenolol selectively blocks beta-1 adrenergic receptors in the heart — reducing heart rate, decreasing force of cardiac contraction, and lowering cardiac output to reduce blood pressure and myocardial oxygen demand. At 25mg this cardioselective beta-1 blockade is introduced at its lowest therapeutic level — producing initial meaningful heart rate and blood pressure reduction while minimising the risk of excessive bradycardia, severe hypotension, and cold extremities during the vulnerable initiation phase. Gradual dose escalation from this baseline allows the cardiologist to find each patient's optimal dose with maximum safety and minimum side effect burden throughout the titration process.
Dosage and Administration
⚠️ Never stop suddenly — abrupt discontinuation causes dangerous rebound hypertension and can trigger severe angina or heart attack. Always increase and decrease dose gradually under cardiologist supervision. Take at the same time each day. Monitor heart rate and blood pressure closely during titration phase.
| Indication | Starting Dose | Titration | Frequency |
|---|---|---|---|
| Hypertension — sensitive initiation | 25mg | Increase to 50mg after 2 weeks if tolerated | Once daily |
| Elderly hypertension | 25mg | Very cautious increase — may remain at 25mg | Once daily |
| Kidney impairment | 25mg | Dose adjusted by cardiologist based on GFR | Once daily |
| Chronic stable angina | 25mg | Increase gradually to symptom control | Once daily |
| Heart failure initiation | 25mg | Extremely slow titration under supervision | Once daily |
Active Ingredients
| Ingredient | Strength |
|---|---|
| Atenolol | 25mg |
Who Should NOT Take Blokium 25mg?
- Allergy to Atenolol or any beta-blocker
- Severe bradycardia — resting heart rate below 60 beats per minute
- Cardiogenic shock or acutely decompensated heart failure requiring intravenous inotropic support
- Second or third degree heart block without a functioning pacemaker
- Sick sinus syndrome without a pacemaker
- Severe asthma or chronic obstructive pulmonary disease
- Severe peripheral artery disease
- Phaeochromocytoma without prior alpha-blocker cover
- Metabolic acidosis
- Pregnancy and breastfeeding — consult cardiologist before use
- Children under 18 years
Side Effects
Common: Mild fatigue and tiredness (ہلکی تھکاوٹ), mildly slow heart rate, mild dizziness especially on standing, mild cold hands and feet, mild headache, mild sleep disturbances — generally very well tolerated at this lowest dose with significantly fewer and milder side effects than higher strengths.
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 worsening of chest pain particularly if dose missed or stopped abruptly (فوری مدد لیں), significant worsening of heart failure — sudden breathlessness with rapid weight gain and ankle swelling (فوری ہسپتال جائیں), significant worsening of asthma or breathing difficulty (فوری مدد لیں), severely low blood pressure with fainting (بے ہوشی — فوری مدد لیں), severe allergic reaction with swelling of face or throat.
Drug Interactions
| Medicine | Interaction |
|---|---|
| Verapamil / Diltiazem | Dangerously additive cardiac depression — severe heart block and bradycardia risk — never combine without strict specialist supervision |
| Antiarrhythmics (Amiodarone, Digoxin) | Additive cardiac conduction slowing — increased bradycardia and heart block risk |
| Other antihypertensives | Additive blood pressure lowering — increased hypotension risk particularly significant at initiation |
| NSAIDs (Ibuprofen, Diclofenac) | Reduce antihypertensive effectiveness of Atenolol — avoid regular combined use |
| Antidiabetic medicines (Insulin, oral hypoglycaemics) | Atenolol masks hypoglycaemia warning signs — monitor blood glucose more frequently |
| Clonidine | Never stop Clonidine abruptly while on Atenolol — severe rebound hypertension |
| Sympathomimetics (adrenaline, decongestants) | Increased blood pressure and heart rate effects — use with caution |
| 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: Why is Blokium started at the lowest 25mg dose for certain patients rather than the standard 50mg? Elderly patients, those with kidney impairment, and heart failure patients are significantly more sensitive to Atenolol's heart rate-slowing effects — starting at 25mg minimises the risk of dangerous bradycardia and hypotension during the critical initiation phase before the cardiologist carefully titrates upward to the effective maintenance dose.
Q: How long does it take for Blokium 25mg to start lowering blood pressure? Initial heart rate and blood pressure reduction begins within the first few days — however stable full antihypertensive effect at each dose level develops over 1 to 2 weeks of consistent daily use. Your cardiologist will assess response at each review before deciding whether dose escalation to 50mg is needed.
Q: Can Blokium 25mg be used long-term without dose escalation for elderly hypertensive patients? Yes — many elderly patients achieve adequate and stable blood pressure control at 25mg without ever requiring escalation to higher doses. The goal is always the lowest effective dose providing satisfactory blood pressure control with minimum side effects — particularly important in elderly patients where fall risk from excessive blood pressure lowering is a significant concern.
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.