Propranolol
Non-selective beta blocker for heart conditions, high blood pressure, and migraine prevention
📊 Quick facts about Propranolol
💡 Key takeaways about Propranolol
- Versatile beta blocker: Propranolol treats a wide range of conditions including high blood pressure, angina, migraines, tremor, and heart rhythm disorders
- Never stop suddenly: Abrupt discontinuation can worsen heart conditions; always taper gradually under medical supervision
- Not suitable for asthma patients: Propranolol blocks beta-2 receptors in the lungs and can trigger severe bronchospasm in people with asthma or COPD
- May mask low blood sugar symptoms: Diabetic patients should monitor blood glucose closely as propranolol can hide typical warning signs of hypoglycemia
- Significant drug interactions: Do not combine with verapamil or diltiazem; many other drugs require dose adjustments when used with propranolol
What Is Propranolol and What Is It Used For?
Propranolol is a non-selective beta-adrenergic blocker that reduces heart rate and blood pressure by blocking the effects of adrenaline and noradrenaline on beta receptors. It is used to treat hypertension, angina, arrhythmias, migraine prevention, essential tremor, thyrotoxicosis, and to protect the heart after a myocardial infarction.
Propranolol belongs to a group of medications called beta blockers (beta-adrenergic antagonists). First developed in the 1960s by Sir James Black — a discovery that earned him the Nobel Prize in Medicine in 1988 — propranolol was the first clinically successful beta blocker and revolutionized the treatment of cardiovascular disease. It remains on the World Health Organization's List of Essential Medicines, reflecting its global importance in healthcare.
Unlike some newer beta blockers that are "cardioselective" (primarily affecting the heart), propranolol is non-selective, meaning it blocks both beta-1 receptors in the heart and beta-2 receptors in the lungs and blood vessels. This broad mechanism of action gives propranolol a uniquely wide range of clinical applications, but also means it must be avoided in patients with respiratory conditions such as asthma.
Propranolol works by reducing the heart rate, decreasing the force of heart contractions, and lowering blood pressure. It also reduces the heart's demand for oxygen, which makes it effective for treating angina (chest pain caused by restricted blood flow to the heart). In the brain, its ability to dampen sympathetic nervous system activity makes it useful for preventing migraines and controlling essential tremor.
Approved indications for Propranolol
Propranolol is approved and widely used for the following medical conditions:
- Hypertension (high blood pressure): Reduces blood pressure by decreasing cardiac output and inhibiting renin release from the kidneys
- Angina pectoris (chest pain): Reduces myocardial oxygen demand, preventing ischemic chest pain during physical exertion or stress
- Cardiac arrhythmias: Controls various types of abnormal heart rhythms, including supraventricular tachycardias and atrial fibrillation
- Post-myocardial infarction: Protects the heart after a heart attack by reducing the workload on the cardiac muscle and decreasing the risk of reinfarction
- Migraine prophylaxis: Prevents migraine attacks by modulating cerebral blood vessel tone and reducing sympathetic nervous system hyperactivity
- Essential tremor: Reduces involuntary, rhythmic shaking by dampening the beta-adrenergic drive that contributes to tremor amplitude
- Thyrotoxicosis and hyperthyroidism: Controls symptoms of overactive thyroid, such as rapid heart rate and tremor, while definitive thyroid treatment takes effect
- Hypertrophic cardiomyopathy: Reduces outflow tract obstruction and improves diastolic filling in patients with thickened heart muscle
- Pheochromocytoma: Used alongside alpha blockers to manage high blood pressure caused by catecholamine-secreting tumors near the kidneys
- Portal hypertension with esophageal varices: Reduces portal venous pressure to prevent life-threatening variceal bleeding in patients with liver cirrhosis
Propranolol is also used off-label for performance anxiety and situational anxiety, although these are not formally approved indications in most countries. It reduces the physical symptoms of anxiety — such as rapid heartbeat, trembling, and sweating — without causing sedation or cognitive impairment. Always discuss off-label use with your healthcare provider.
What Should You Know Before Taking Propranolol?
Propranolol must not be used by patients with uncontrolled heart failure, severe bradycardia, heart block, asthma, metabolic acidosis, very low blood pressure, or untreated pheochromocytoma. Always tell your doctor about all your medical conditions and medications before starting propranolol.
Before starting treatment with propranolol, it is essential to have a thorough discussion with your healthcare provider about your medical history, current medications, and any pre-existing conditions. Propranolol has a number of important contraindications and precautions that must be considered to ensure your safety.
Contraindications
You must not take propranolol if you have any of the following conditions:
- Allergy to propranolol hydrochloride or any of the other ingredients in the formulation
- Uncontrolled or untreated heart failure — propranolol can further reduce cardiac output
- Cardiogenic shock — a condition caused by the heart's inability to pump sufficient blood
- Second- or third-degree heart block — severe conduction abnormalities (unless a pacemaker is in place)
- Severe bradycardia — abnormally slow heart rate
- Metabolic acidosis — increased acidity in the blood
- Asthma, wheeze, or severe respiratory disease — propranolol can cause life-threatening bronchospasm
- Untreated pheochromocytoma — must be treated with alpha blockers first
- Severe peripheral circulatory disorders — conditions causing poor blood flow to fingers and toes
- Prinzmetal's angina — variant angina caused by coronary artery spasm
- Very low blood pressure (severe hypotension)
- Prolonged fasting or strict dietary restriction — increases risk of hypoglycemia
Propranolol must never be used in patients with asthma or a history of bronchospasm. Unlike cardioselective beta blockers (e.g., bisoprolol, atenolol), propranolol blocks beta-2 receptors in the airways and can cause severe, potentially fatal bronchospasm. If you have any history of wheezing or breathing difficulties, inform your doctor immediately.
Warnings and Precautions
Talk to your doctor or pharmacist before taking propranolol if you:
- Have diabetes: Propranolol can alter your normal response to low blood sugar. The typical warning sign of hypoglycemia — increased heart rate — may be masked by the medication. Propranolol can also cause low blood sugar even in patients who do not have diabetes.
- Have thyrotoxicosis: Propranolol can mask the symptoms of thyroid overactivity. Do not stop the medication abruptly, as this may precipitate a thyroid crisis.
- Have kidney or liver problems (including cirrhosis): Your doctor may need to adjust your dose and monitor you more closely during treatment.
- Have heart problems: Including mild heart failure that is being treated. Propranolol can worsen heart failure in some patients.
- Suffer from myasthenia gravis: Propranolol may exacerbate the muscle weakness characteristic of this condition.
- Have COPD or chronic bronchitis: While not an absolute contraindication like asthma, propranolol may worsen bronchospasm in these patients.
- Use calcium channel blockers such as verapamil or diltiazem that reduce heart contractility (see Drug Interactions section).
- Have psoriasis or a family history of psoriasis — propranolol can trigger or worsen psoriasis.
- Have allergic conditions: Propranolol may increase the severity of allergic reactions and reduce the effectiveness of adrenaline used to treat anaphylaxis.
- Wear contact lenses: Propranolol can reduce tear production, causing dry eyes and discomfort.
- Smoke: Smoking may reduce the effectiveness of propranolol through increased hepatic metabolism.
If you are scheduled for any surgical procedure, always inform your anesthesiologist that you are taking propranolol. The interaction between propranolol and anesthetic agents requires careful management to avoid severe hypotension and bradycardia during surgery.
Pregnancy and Breastfeeding
If you are pregnant, think you may be pregnant, or are planning to have a baby, consult your doctor or pharmacist before using propranolol.
Pregnancy: Propranolol is generally not recommended during pregnancy unless the potential benefit to the mother clearly outweighs the risk to the fetus. Beta blockers can reduce placental blood flow, potentially causing intrauterine growth restriction, neonatal hypoglycemia (low blood sugar in the newborn), and neonatal bradycardia (slow heart rate). If propranolol is used during pregnancy, close monitoring of the fetus and newborn is essential.
Breastfeeding: Propranolol passes into breast milk, although in small amounts. Breastfeeding is generally not recommended while taking propranolol. If your doctor decides that the benefits outweigh the risks, the infant should be monitored for signs of beta blockade, such as slow heart rate and low blood sugar.
Driving and Using Machines
Propranolol is unlikely to impair your ability to drive or operate machinery. However, some people may occasionally experience dizziness or fatigue, particularly at the start of treatment. If you experience these symptoms, avoid driving or operating heavy machinery until you know how propranolol affects you. Your ability to react may be impaired if you experience side effects.
How Does Propranolol Interact with Other Drugs?
Propranolol has significant interactions with calcium channel blockers (verapamil, diltiazem), heart medications (amiodarone, digoxin), NSAIDs (ibuprofen, indomethacin), migraine drugs (ergotamine, rizatriptan), cimetidine, rifampicin, and clonidine. Always inform your doctor about all medications you are taking, including over-the-counter medicines and herbal supplements.
Propranolol can affect the way other medicines work, and some medicines can alter the effectiveness and safety of propranolol. It is critically important to tell your doctor or pharmacist about all medications you are taking, have recently taken, or plan to take. This includes prescription medicines, over-the-counter drugs, and herbal supplements.
Major Interactions
The following drug combinations require special caution or should be avoided entirely:
Propranolol must not be used together with calcium channel blockers that reduce cardiac contractility, such as verapamil and diltiazem. This combination can lead to severe hypotension (dangerously low blood pressure) and bradycardia (dangerously slow heart rate), potentially resulting in cardiac arrest. Intravenous verapamil should never be given to a patient taking propranolol.
| Drug / Class | Effect of Interaction | Severity | Action Required |
|---|---|---|---|
| Verapamil, Diltiazem | Severe hypotension, bradycardia, cardiac arrest risk | Major | Avoid combination |
| Amiodarone, Propafenone | Enhanced bradycardia and hypotension | Major | Avoid or use with extreme caution |
| Clonidine | Rebound hypertension if clonidine stopped first | Major | Stop propranolol days before tapering clonidine |
| Fingolimod | Enhanced bradycardia at treatment initiation | Major | Cardiac monitoring required |
| Epinephrine (adrenaline) | Severe hypertension due to unopposed alpha stimulation | Major | Use with extreme caution; higher doses of adrenaline may be needed for anaphylaxis |
| MAO inhibitors | Potential severe hypertensive crisis | Major | Avoid combination |
Moderate Interactions
The following medications may interact with propranolol and require monitoring or dose adjustment:
| Drug / Class | Effect of Interaction | Action Required |
|---|---|---|
| Nifedipine, Nisoldipine, Nicardipine, Isradipine, Lacidipine | Increased hypotensive effect; possible heart failure | Monitor blood pressure closely |
| Ibuprofen, Indomethacin (NSAIDs) | Reduced antihypertensive effect of propranolol | Monitor blood pressure; consider alternative analgesic |
| Cimetidine | Increased propranolol blood levels (inhibits metabolism) | Monitor for excessive beta blockade; dose reduction may be needed |
| Rifampicin | Reduced propranolol blood levels (induces metabolism) | Higher propranolol doses may be needed |
| Rizatriptan | Increased rizatriptan plasma concentration | Reduce rizatriptan dose to 5 mg |
| Ergotamine, Dihydroergotamine | Increased risk of peripheral vasoconstriction | Monitor for cold extremities; avoid if possible |
| Lidocaine | Increased lidocaine levels due to reduced hepatic clearance | Monitor for lidocaine toxicity |
| Theophylline | Mutual antagonism; reduced effectiveness of both drugs | Avoid combination in asthmatic patients |
| Warfarin | Increased warfarin effect; higher INR | Monitor INR more frequently |
| Chlorpromazine, Thioridazine | Increased levels of both drugs | Monitor for excessive effects of either drug |
| Fluvoxamine | Increased propranolol levels (inhibits CYP1A2) | Monitor heart rate and blood pressure |
| Cardiac glycosides (Digoxin) | Additive bradycardic effect | Monitor heart rate; adjust doses as needed |
Alcohol can enhance the blood-pressure-lowering effect of propranolol, potentially causing dizziness and lightheadedness. It may also alter the rate of propranolol absorption. Moderate alcohol consumption should be discussed with your healthcare provider.
What Is the Correct Dosage of Propranolol?
Propranolol dosage varies widely depending on the condition being treated. For hypertension, the typical starting dose is 40 mg two to three times daily, with a maximum of 320 mg per day. For migraine prevention, the usual range is 80–160 mg daily. Always follow your doctor's specific dosing instructions.
Always take propranolol exactly as prescribed by your doctor, pharmacist, or nurse. Do not change your dose without medical advice. Swallow propranolol tablets whole with a glass of water before meals. Do not chew or crush the tablets.
Adult Dosage
The following table shows the recommended doses for adults. Your doctor will determine the most appropriate dose for your individual condition and response to treatment.
| Condition | Starting Dose | Maximum Daily Dose |
|---|---|---|
| Hypertension | 40 mg two or three times daily; increase by 80 mg per day at weekly intervals | 160–320 mg |
| Angina / Tremor | 40 mg two to three times daily; increase by 40 mg per day at weekly intervals | 120–240 mg |
| Post-myocardial infarction | 40 mg four times daily; after a few days, change to 80 mg twice daily | 160 mg |
| Migraine prevention | 40 mg two to three times daily; increase by 40 mg per day at weekly intervals | 80–160 mg |
| Arrhythmias / Thyrotoxicosis / Hypertrophic cardiomyopathy | 10–40 mg three or four times daily | 120–160 mg |
| Pheochromocytoma | Pre-operative: 60 mg/day; Non-operable: 30 mg/day | 30–60 mg |
| Portal hypertension | 40 mg twice daily; increase to 80 mg twice daily | 160–320 mg |
Children
Propranolol may also be used to treat children with migraine and arrhythmias. Pediatric dosing is determined by the child's age, weight, and the condition being treated.
- Migraine prevention in children under 12: 20 mg two or three times daily
- Migraine prevention in children over 12: Same dose as for adults
- Arrhythmias in children: The dose is individually adjusted by the physician based on the child's age and body weight
In neonates and infants, propranolol oral solution (such as Hemangiol 3.75 mg/ml) may be used for the treatment of infantile hemangioma under specialist supervision. Dosing in this population requires very careful medical oversight due to the risk of hypoglycemia and other adverse effects.
Elderly Patients
Older adults should begin with the lowest available dose and have their dosage increased gradually. The optimal dose should be determined individually by the physician, taking into account age-related changes in drug metabolism, kidney function, and overall health. Elderly patients may be more susceptible to the hypotensive effects of propranolol and to central nervous system side effects such as confusion and depression.
Liver or Kidney Impairment
Patients with liver or kidney impairment may require dose adjustments. Since propranolol undergoes extensive hepatic (liver) metabolism, patients with liver cirrhosis or significant liver disease may have substantially higher blood levels of the drug. Your doctor will determine the optimal dose based on careful monitoring.
Missed Dose
If you forget to take a dose, take it as soon as you remember. However, if it is almost time for your next scheduled dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for a forgotten dose.
Overdose
If you have taken more propranolol than prescribed, or if a child has accidentally ingested the medication, contact your doctor, hospital, or poison control center immediately. Take the remaining tablets and packaging with you so the medication can be identified.
Symptoms of propranolol overdose include:
- Extremely slow heart rate (severe bradycardia)
- Dangerously low blood pressure (severe hypotension)
- Heart failure and breathing difficulties
- Fatigue, hallucinations, fine tremor, confusion
- Nausea, vomiting, and body spasms
- Fainting, seizures, or coma
- Low blood sugar (hypoglycemia)
Do not stop taking propranolol without consulting your doctor. In some cases, particularly in patients with angina or after a heart attack, abrupt discontinuation can lead to rebound effects including worsening of angina, heart rhythm disturbances, and in rare cases, myocardial infarction. If discontinuation is necessary, your doctor will gradually reduce your dose over 1–2 weeks.
What Are the Side Effects of Propranolol?
Common side effects of propranolol include cold hands and feet, slow heartbeat, fatigue, dizziness, sleep disturbances, and nightmares. Uncommon side effects include nausea, vomiting, and muscle weakness. Rare but serious side effects include bronchospasm, heart failure, severe allergic reactions, and very low blood sugar. Most side effects are manageable and may improve over time.
Like all medicines, propranolol can cause side effects, although not everyone experiences them. The following list categorizes potential side effects by how frequently they occur, based on clinical trial data and post-marketing surveillance reports. If you experience any side effect that concerns you, or if a side effect worsens, contact your doctor.
Common
- Cold fingers and toes due to reduced peripheral circulation
- Slow heart rate (bradycardia)
- Postural hypotension (dizziness when standing up), fainting, palpitations
- Heart rhythm disturbances; worsening of existing heart failure
- Raynaud's phenomenon (numbness and spasm in fingers followed by warmth and pain)
- Sleep disturbances and nightmares, especially at the beginning of treatment
- Dizziness, confusion
- Tiredness and fatigue (often temporary)
- Allergic skin reactions: redness, itching, rash, hair loss
Uncommon
- Nausea, vomiting, diarrhea, or constipation
- Muscle weakness
Rare
- Bronchospasm (breathing difficulties due to narrowed airways) — potentially fatal in patients with asthma
- Heart failure; worsening of pre-existing heart conditions
- Angioedema (swelling of the face, tongue, throat, abdomen, or limbs)
- Dizziness, especially when standing up
- Worsening of peripheral circulation in hands and feet
- Mood changes, confusion, psychosis, or hallucinations (especially after too-rapid withdrawal)
- Paraesthesia (tingling or numbness in extremities)
- Visual disturbances; dry eyes
- Thrombocytopenia (reduced platelet count) — easy bruising or bleeding
- Purpura (purple spots on skin), severe hair loss, psoriasis-like skin reactions
- Dry mouth
Very Rare
- Severe reduction in white blood cell count (agranulocytosis)
- Transient increase in certain white blood cells (eosinophilia)
- Worsening of myasthenia gravis; headache; depression
- Low blood sugar (hypoglycemia) — can occur in diabetic and non-diabetic patients, including elderly, dialysis patients, and those who are fasting
- Worsening of diabetes; altered blood lipid levels (decreased HDL cholesterol, increased triglycerides)
- Excessive sweating; conjunctivitis (eye inflammation)
- Muscle pain and cramps; joint disease (arthropathy) with long-term use
- Worsening of kidney function in patients with severe renal impairment
- Sexual dysfunction (decreased libido, erectile dysfunction)
- Elevation of liver enzymes (GOT, GPT) and antinuclear antibodies (ANA)
Side Effects in Children
In addition to the side effects listed above, children may experience:
- Very rare: Low blood sugar levels in neonates, infants, and children
- Unknown frequency: Seizures caused by low blood sugar in neonates, infants, and children
Reporting suspected side effects after a medicine has been authorized is essential. It allows continuous monitoring of the benefit-risk balance of the medication. Healthcare professionals and patients are encouraged to report suspected adverse reactions to their national pharmacovigilance authority.
Discontinuation of propranolol should only be done after consulting your doctor and should generally be done gradually over 1–2 weeks to avoid rebound effects.
How Should You Store Propranolol?
Store propranolol out of the sight and reach of children. No special storage conditions are required. Do not use after the expiration date printed on the packaging. Dispose of unused medication properly — do not throw it in household waste or down the drain.
Proper storage of medication ensures it remains safe and effective throughout its shelf life. Follow these guidelines for storing propranolol:
- Keep out of the sight and reach of children at all times
- No special storage conditions are required — store at room temperature
- Do not use propranolol after the expiration date printed on the label or blister pack. The expiration date refers to the last day of the stated month.
- Dispose of unused medication properly: Do not flush medicines down the toilet or throw them in the household waste. Ask your pharmacist how to dispose of medicines that are no longer needed. These measures help protect the environment.
What Does Propranolol Contain?
The active substance is propranolol hydrochloride. Film-coated tablets are available in 10 mg and 40 mg strengths. Inactive ingredients include maize starch, lactose monohydrate, microcrystalline cellulose, magnesium stearate, and a film coating containing hypromellose and titanium dioxide.
Active Substance
The active substance is propranolol hydrochloride. Each film-coated tablet contains either 10 mg or 40 mg of propranolol hydrochloride. The oral solution (Hemangiol) contains 3.75 mg/ml propranolol hydrochloride.
Inactive Ingredients (Excipients)
The tablet formulation (e.g., Propranolol Accord) contains the following inactive ingredients:
- Tablet core: Maize starch, lactose monohydrate, microcrystalline cellulose (E460), magnesium stearate
- Film coating: Hypromellose (E464), microcrystalline cellulose (E460), acetylated mono- and diglycerides, titanium dioxide (E171)
Propranolol tablets contain lactose monohydrate. If you have been told by your doctor that you have an intolerance to certain sugars, contact your doctor before taking this medicine.
Appearance and Packaging
Propranolol film-coated tablets are typically white to off-white, round, biconvex (rounded on both sides). The 10 mg tablet is usually marked with "AI" on one side and a score line on the other. The 40 mg tablet is marked with "AL" on one side and a score line on the other. The score line is to facilitate swallowing only and not intended to break the tablet into equal doses.
Blister packs of PVC/PVDC/aluminium foil are available in various sizes (25, 28, 30, 50, 56, 60, 100, and 250 film-coated tablets). Not all pack sizes may be marketed in every country.
Frequently Asked Questions About Propranolol
Medical References and Sources
This article is based on current medical research, international guidelines, and approved prescribing information. All claims are supported by scientific evidence from peer-reviewed sources.
- European Medicines Agency (EMA). "Propranolol – Summary of Product Characteristics (SmPC)." European Medicines Agency Official European prescribing information for propranolol.
- British National Formulary (BNF). "Propranolol hydrochloride." NICE, 2025. BNF – NICE Comprehensive UK drug monograph including dosage, interactions, and side effects.
- World Health Organization (WHO). "WHO Model List of Essential Medicines – 23rd List, 2023." WHO Essential Medicines Propranolol is listed as an essential medicine for cardiovascular disease.
- U.S. Food and Drug Administration (FDA). "Propranolol Hydrochloride – Prescribing Information." FDA Drug Labels Official US prescribing information approved by the FDA.
- Wiysonge CS, et al. "Beta-blockers for hypertension." Cochrane Database of Systematic Reviews, 2017(1):CD002003. Cochrane Library Systematic review of beta blockers for treating high blood pressure. Evidence level: 1A.
- Linde K, Rossnagel K. "Propranolol for migraine prophylaxis." Cochrane Database of Systematic Reviews, 2004(2):CD003225. Cochrane Library Systematic review of propranolol's efficacy for migraine prevention.
- Williams B, et al. "2018 ESC/ESH Guidelines for the management of arterial hypertension." European Heart Journal, 2018;39(33):3021-3104. European Heart Journal European guidelines for hypertension management including beta blocker use.
- Black JW, Stephenson JS. "Pharmacology of a new adrenergic beta-receptor-blocking compound (Nethalide)." The Lancet, 1962;280(7251):311-314. Landmark publication describing the development of the first beta blocker, leading to the discovery of propranolol.
Evidence grading: This article uses the GRADE framework (Grading of Recommendations Assessment, Development and Evaluation) for evidence-based medicine. Evidence level 1A represents the highest quality of evidence, based on systematic reviews of randomized controlled trials.
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