Drug Info
- Brand Name: Inderal LA
- Active Ingredient: Propranolol Hydrochloride
- Manufacturer: AstraZeneca
Active substance: Propranolol Hydrochloride
Propranolol blocks cardiac β1 receptors (↓rate/contractility) and renal β1 receptors (↓renin), while peripheral β2 blockade dampens adrenergic tremor and may aid migraine prevention through vascular and central mechanisms. The ER formulation releases propranolol gradually along the GI tract, maintaining therapeutic levels through the day and night with a single morning or evening dose. Food can modestly influence exposure; taking the pills at a consistent time in relation to meals helps keep effects predictable.
Hepatic first-pass metabolism leads to inter-patient variability; dose is titrated to clinical response (heart rate/BP targets, symptom control). Because β2 blockade can provoke bronchospasm, Inderal LA is contraindicated in asthma and used cautiously in COPD.
Indications for use
Use is determined by the prescriber according to regional labeling and individual assessment. Common indications include:
- Hypertension (as monotherapy or with other antihypertensives)
- Angina pectoris (reducing frequency of effort-related chest pain)
- Rate control in supraventricular tachycardias including atrial fibrillation/flutter
- Migraine prophylaxis (prevention, not acute treatment)
- Essential tremor (symptomatic control)
- Hypertrophic subaortic stenosis (symptom relief)
- Pheochromocytoma (adjunct): only after adequate α-blockade under specialist care
Treatment regimens and dosages
Use Inderal LA exactly as prescribed. Representative adult once-daily schedules (clinician-directed):
- Hypertension: start 80 mg once daily; titrate every 1–2 weeks to 120–160 mg once daily (some need up to 320 mg/day).
- Angina pectoris: 80–160 mg once daily; adjust to reduce exertional chest pain without bradycardia/hypotension.
- Rate control in SVT/AF: 80–160 mg once daily to meet heart-rate targets; higher doses are specialist-directed.
- Migraine prophylaxis: 80 mg once daily, increasing stepwise to 120–160 mg once daily (selected patients up to 240 mg/day).
- Essential tremor: begin 80 mg once daily; titrate to 120–240 mg once daily as needed and tolerated.
General rules: swallow pills whole with water; do not crush or chew. Take at the same time each day. Do not stop suddenly—plan a gradual taper with your clinician.
Recommendations for use
Keep a simple log of resting/active heart rate, blood pressure, and target symptoms (angina episodes, migraine days, tremor severity). If dizziness or unusual fatigue appears during titration, discuss dose timing (morning vs evening) and avoid rapid posture changes. People with diabetes should monitor glucose routinely—β-blockers can mask hypoglycemia warning signs (tremor, palpitations). For migraine, combine medication with trigger management (regular sleep/meals, hydration, caffeine moderation).
Missed Dose
Take the missed once-daily dose when remembered unless it is close to the next dose. Do not double. Resume the regular schedule. If multiple doses are missed—especially in angina—seek advice on a safe restart.
Precautions
- Respiratory: contraindicated in asthma or past bronchospasm; caution in COPD.
- Cardiac conduction/contractility: avoid in severe bradycardia, 2nd/3rd-degree AV block, sick sinus syndrome (without pacemaker), cardiogenic shock, decompensated heart failure. Use carefully in stabilized heart failure.
- Peripheral circulation: may worsen Raynaud’s phenomenon or severe peripheral arterial disease.
- Metabolic: masks hypoglycemia; may alter lipids (↑TG, ↓HDL) in some patients.
- Thyrotoxicosis: can mask tachycardia—do not withdraw abruptly.
- Anaphylaxis: reduced responsiveness to epinephrine while on β-blockers.
- Surgery/anesthesia: inform the anesthetist; perioperative plans are individualized.
- Hepatic impairment: start low and titrate cautiously.
- Driving/hazardous tasks: assess personal response—dizziness and fatigue can occur.
Use during pregnancy
Use only when potential benefit justifies risk (e.g., specific arrhythmias). Potential fetal/neonatal effects include growth restriction, bradycardia, hypoglycemia; if used late in pregnancy, neonatal monitoring is advised. Small amounts pass into breast milk; breastfeeding decisions require clinician guidance with infant observation for bradycardia or poor feeding.
Possible side effects
- Common: bradycardia, fatigue, dizziness, cold extremities, sleep disturbance or vivid dreams, GI upset (nausea, diarrhea).
- Less common: depression or mood change, rash, impotence, bronchospasm in susceptible individuals, hypotension.
- Serious—seek care: fainting, severe shortness of breath, new/worsening chest pain, extreme bradycardia, wheeze in non-asthmatics, signs of heart block.
Propranolol (extended-release): interaction with other drugs
- Verapamil / diltiazem (non-DHP CCBs): risk of bradycardia/AV block/heart failure—avoid IV combinations; oral combinations require specialist oversight.
- Other rate/BP-lowering agents (digoxin, amiodarone, clonidine, antihypertensives): additive effects. If stopping clonidine, taper propranolol first to curb rebound.
- CYP1A2/2D6 modulators: inhibitors (e.g., fluvoxamine, paroxetine, quinidine) may raise levels; inducers (e.g., smoking, rifampin) may lower levels—dose review may be needed.
- NSAIDs: can blunt antihypertensive effect—monitor BP.
- Hypoglycemics/insulin: altered hypoglycemia awareness—tight glucose monitoring.
- Anesthetics and alcohol: additive hypotension/CNS depression.
Always provide a complete list of prescription/OTC medicines and supplements.
Analogs & Generics
Same active ingredient (propranolol — extended-release and immediate-release, international examples)
- Inderal LA / Propranolol ER (various manufacturers) — 60 mg, 80 mg, 120 mg, 160 mg once daily
- Propranolol IR tablets (Teva, Sandoz/Hexal, Accord/Actavis, Viatris/Mylan) — 10 mg, 40 mg, 80 mg in divided doses
- Propranolol oral solution (market-dependent) — for titration/pediatric needs
Drug analogs (different active ingredient, same purpose — examples)
- Hypertension/angina/arrhythmia: Metoprolol ER, Bisoprolol, Atenolol, Carvedilol, Nebivolol
- Migraine prophylaxis: Metoprolol, Timolol, Topiramate, Amitriptyline (clinician-selected)
- Essential tremor: Primidone, Topiramate (alternatives/adjuncts)
Storage
Store at 15–25°C in a dry place away from heat and light. Keep pills in the original packaging and out of the reach of children. Do not use after the expiry date on the pack.
Customer Experience – What to Expect
With once-daily Inderal LA, many patients notice steadier 24-hour control: fewer palpitations, calmer heart rate, and lower BP within 1–2 weeks as the dose is optimized. Migraine prevention builds over 4–8 weeks; for essential tremor, improvement can appear at the first effective dose and refine with titration. Early fatigue or cold hands/feet usually ease after timing adjustments. A brief diary of heart rate/BP, angina episodes, migraine days, or tremor ratings helps fine-tune dosing and confirms benefit at follow-up.
FAQ
How is Inderal LA different from regular Inderal?
Inderal LA is extended-release, taken once daily for 24-hour coverage; immediate-release tablets are taken multiple times per day.
How fast does Inderal LA work?
Heart-rate/BP effects begin within hours; sustained benefits for angina, migraines, and tremor accrue over days to weeks.
Can I take it if I have asthma?
No. Non-selective β-blockers are contraindicated in asthma due to bronchospasm risk.
What if I miss a dose?
Take it when remembered unless near the next dose. Do not double.
Can I stop suddenly?
Avoid abrupt withdrawal—taper over 1–2 weeks under medical supervision.
Does it affect blood sugar awareness?
Yes, it can mask hypoglycemia symptoms. Monitor closely if you have diabetes.
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