Inderal

What Is Inderal?

Inderal is an oral immediate-release tablet of propranolol hydrochloride 20 mg / 40 mg from AstraZeneca, supplied in 30-180 tablet packs. Propranolol was the first beta-blocker introduced into clinical practice (Sir James Black, 1964; Nobel Prize 1988) and remains the benchmark non-selective beta-blocker — widely used across multiple indications and arguably the most important cardiovascular drug ever developed.

The immediate-release formulation has a short plasma half-life (3-6 hours) and requires twice- or thrice-daily dosing. For once-daily dosing, consider Inderal LA (long-acting).

How Propranolol Prevents Migraine

The precise mechanism in migraine prophylaxis remains debated (this was actually serendipitously discovered when propranolol-treated angina patients noticed their migraines improved). Current theories include:

• Beta-1 blockade — may reduce sympathetic-nervous-system-mediated cranial arterial reactivity
• Beta-2 blockade — may block cortical noradrenaline release and lower cortical excitability
• 5-HT antagonism — propranolol has modest serotonin-receptor binding at clinical doses; possible cortical spreading depression suppression
• Membrane-stabilising action — may reduce neuronal excitability in trigeminal nucleus caudalis

Only lipophilic non-selective beta-blockers (propranolol, metoprolol, nadolol, timolol) work for migraine prevention — water-soluble atenolol and selective agents like bisoprolol do not. The CNS-penetrating non-selective profile is the active ingredient.

Approved Uses

• Migraine prophylaxis (FDA-approved 1979)
• Hypertension
• Angina pectoris
• Atrial fibrillation rate control
• Essential tremor
• Thyrotoxicosis — symptom control during hyperthyroid phase
• Infantile haemangioma — first-line since 2008
• Portal hypertension variceal prophylaxis
• Performance anxiety (off-label; reduces tremor and palpitations)
• Phaeochromocytoma — ONLY after alpha-blockade; never as monotherapy

Inderal Dosage for Migraine Prevention

• Week 1-2: 20 mg twice daily (or 40 mg nightly)
• Week 3-4: 40 mg twice daily
• Target: 40-80 mg twice daily (80-160 mg/day total)
• Take with or without food.
• Assess benefit at 8-12 weeks with a migraine diary.
• If <50% reduction at 12 weeks with target dose, switch agent.

Monitoring: check pulse (<50 bpm = dose reduction), blood pressure (hypotension caution), and clinical response. Routine blood work is not needed.

Discontinuation: Taper over 1-2 weeks. Abrupt discontinuation of a beta-blocker can precipitate rebound tachycardia, angina, or myocardial infarction in patients with cardiovascular disease — even in migraineurs without heart disease, taper slowly.

Side Effects

Very common:

• Fatigue, lethargy (often adapts over 2-4 weeks)
• Cold hands and feet
• Bradycardia (check pulse — stop if <50 bpm)
• Exercise intolerance (heart-rate response to exercise is blunted)
• Dizziness, postural hypotension

Common (1-10%):

• Sleep disturbance — vivid dreams or nightmares (lipophilic beta-blocker effect crossing the blood-brain barrier)
• Depression, mood changes (mostly at higher doses)
• Reduced libido, erectile dysfunction
• Gastrointestinal upset
• Raynaud-like cold intolerance in the hands

Important but less common:

• Bronchospasm — can be severe in asthmatics and COPD patients (beta-2 blockade). Absolute contraindication in asthma.
• Masked hypoglycaemia in diabetics on insulin — propranolol blocks the tachycardia/tremor warning signs of low blood sugar while delaying recovery.
• Heart block or worsening heart failure in susceptible patients

Contraindications

• Asthma, severe COPD, bronchospasm of any cause — absolute
• Second or third degree atrioventricular block
• Sinus bradycardia <50 bpm
• Cardiogenic shock, decompensated heart failure
• Severe peripheral arterial disease, Raynaud’s syndrome (relative)
• Phaeochromocytoma without prior alpha-blockade (never use beta-blocker first — paradoxical hypertensive crisis)
• Hypersensitivity to propranolol

Pregnancy: FDA Category C but with extensive reassuring real-world data. Propranolol is the preferred migraine preventive in women planning or during pregnancy. Small risk of mild intrauterine growth restriction, neonatal bradycardia, and hypoglycaemia; these are monitored but rarely clinically significant.

Breastfeeding: compatible. Minimal amounts in breast milk; routine use during breastfeeding is considered safe.

Drug Interactions

• Verapamil, diltiazem (non-dihydropyridine CCBs) — additive bradycardia and heart-block risk; avoid combination
• Other beta-blockers — additive effect; do not combine
• Rizatriptan — propranolol increases rizatriptan plasma levels ~70%; reduce rizatriptan dose to 5 mg maximum
• NSAIDs — may reduce the antihypertensive effect of propranolol (less relevant for migraine indication)
• Insulin / sulphonylureas — mask hypoglycaemia symptoms
• Alcohol — additive hypotension and CNS depression
• Fluvoxamine, fluoxetine — inhibit CYP2D6; can raise propranolol levels

Storage

Store below 25°C. Keep out of reach of children.

Frequently Asked Questions

How long until Inderal starts preventing migraines?

Allow 8-12 weeks at target dose. Keep a migraine diary. A clinically meaningful response is a 50% reduction in monthly migraine days. If no response after 12 weeks at 160 mg/day, switch preventive (topiramate, valproate ER, amitriptyline, flunarizine).

Can I take Inderal if I have asthma?

No — propranolol is non-selective and blocks beta-2 receptors in bronchial smooth muscle, which can precipitate severe bronchospasm in asthmatics. Absolute contraindication. For asthmatic migraineurs, topiramate, amitriptyline, or flunarizine are safer alternatives.

Is Inderal safe in pregnancy?

Yes — propranolol is the preferred migraine preventive in pregnancy and in women of childbearing potential. Extensive reassuring real-world data; small risk of mild intrauterine growth restriction, neonatal bradycardia, and hypoglycaemia (monitored but rarely problematic). Topiramate and valproate are contraindicated; propranolol is the go-to option.

Will Inderal affect my exercise performance?

Yes to some extent — beta blockade blunts the heart-rate response to exercise, so your maximum heart rate is lower and you fatigue faster at high intensities. For recreational exercise most people adapt; for competitive endurance athletes, propranolol can substantially impair performance and is banned in some sports (archery, shooting — where it reduces tremor). Discuss with your doctor if you train competitively.

Can I drink alcohol on Inderal?

Moderate alcohol is generally acceptable but alcohol potentiates the hypotensive and CNS-depressant effects. Stand up slowly after drinking. Alcohol is also a common migraine trigger, so reducing intake often improves migraine frequency independently.

How do I stop Inderal?

Taper over 1-2 weeks. Abrupt discontinuation of a beta-blocker can cause rebound tachycardia and — in patients with any cardiovascular disease — precipitate angina or MI. Migraine itself may also flare on abrupt stop.

Is Inderal IR better than Inderal LA?

Inderal IR needs twice- or thrice-daily dosing and has higher peak plasma levels. For migraine prevention, Inderal LA is the preferred formulation (once daily, smoother levels). IR is useful when dose flexibility matters (performance anxiety, tremor, thyrotoxicosis).

Can I take Inderal with a triptan?

Yes. Propranolol is a preventive, triptans are abortive. They work through different mechanisms. Special note: rizatriptan levels rise ~70% when combined with propranolol — use rizatriptan at 5 mg maximum (not 10 mg) when also on propranolol. Sumatriptan and zolmitriptan do not have this interaction.

Where can I buy Inderal online?

You can buy Inderal (propranolol 20 mg / 40 mg immediate-release tablet, 30-180 tablet packs) from MedsBase with discreet packaging and worldwide shipping.

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