Carvedilol

High blood pressure, angina, and heart failure are serious cardiovascular conditions that require careful and consistent long-term management. Carvedilol tablets are a prescription beta blocker with additional alpha-blocking properties, used to treat hypertension, angina pectoris, and stable chronic heart failure in adults. Its dual mechanism of action distinguishes it from other beta blockers and gives it a broader cardiovascular profile. Carvedilol is taken twice daily and is available in four strengths to support careful dose titration, particularly in heart failure. A prescription can only be issued following a clinical consultation with a registered prescriber.

Carvedilol tablets are an oral prescription medicine containing carvedilol as the active ingredient. Carvedilol is classified as a non-selective beta adrenoceptor blocker with additional alpha-1 adrenoceptor blocking activity. This dual action distinguishes carvedilol from most other beta blockers, which act only on beta receptors. Because carvedilol also blocks alpha-1 receptors, it causes vasodilation (widening of blood vessels) in addition to reducing heart rate and cardiac output, providing a combined antihypertensive effect.

Carvedilol is licensed in the United Kingdom for three indications: treatment of mild to moderate essential hypertension; treatment of stable angina pectoris; and treatment of stable mild to severe chronic heart failure as an adjunct to standard therapy. It is available in four strengths: 3.125mg, 6.25mg, 12.5mg, and 25mg tablets. The four-strength range reflects the need for careful titration, particularly in heart failure, where the starting dose is low, and increases must be made slowly under clinical supervision.

All clinical information on this page is drawn from the current UK Summary of Product Characteristics for carvedilol tablets.

Important: Do not stop taking carvedilol suddenly without speaking to your prescriber first. Abrupt withdrawal of a beta blocker can cause a rebound increase in heart rate and blood pressure and may trigger or worsen angina or cause serious cardiac events. In patients with heart failure, sudden withdrawal can lead to a significant deterioration in cardiac function. Your prescriber will advise on how to reduce your dose gradually if treatment needs to be stopped.

Carvedilol works through two distinct mechanisms that together produce its cardiovascular effects.

Beta-1 and Beta-2 Adrenoceptor Blockade

Carvedilol is a non-selective beta blocker, meaning it blocks both beta-1 receptors in the heart and beta-2 receptors in the airways and blood vessels. By blocking beta-1 receptors, carvedilol reduces heart rate and the force of cardiac contraction, lowering cardiac output and blood pressure. Non-selective blockade of beta-2 receptors means carvedilol is more likely than cardioselective beta blockers (such as bisoprolol or atenolol) to affect the airways, and it is contraindicated in patients with asthma or significant bronchospasm for this reason.

Alpha-1 Adrenoceptor Blockade

In addition to its beta-blocking action, carvedilol blocks alpha-1 adrenoceptors found on the walls of blood vessels. Alpha-1 stimulation normally causes vasoconstriction (narrowing of blood vessels). By blocking these receptors, carvedilol causes vasodilation, which lowers peripheral vascular resistance and reduces blood pressure. This additional mechanism gives carvedilol a broader antihypertensive effect than beta blockade alone and is responsible for the postural hypotension sometimes seen, particularly at the start of treatment.

Effect on Heart Failure

In stable chronic heart failure, prolonged sympathetic nervous system activation contributes to progressive deterioration of cardiac function. By blocking both beta adrenoceptors and alpha-1 receptors, carvedilol reduces heart rate, lowers the pressure the heart works against, and reduces cardiac remodelling over time. Clinical evidence from trials including COPERNICUS and MERIT-HF support that carvedilol reduces mortality and hospitalisation in patients with stable chronic heart failure. Treatment in heart failure must be started at the lowest dose and increased very slowly under close supervision.

Always take carvedilol exactly as your prescriber instructs. The information below summarises key points from the current UK SmPC. Read the Patient Information Leaflet supplied with your medicine before starting treatment.

• Take carvedilol twice daily, with food. Taking carvedilol with food slows absorption and reduces the risk of postural hypotension, particularly in heart failure patients. Do not take on an empty stomach.
• Take your doses at the same times each day, ideally morning and evening, to maintain consistent levels in your body.
• Swallow the tablet whole with a drink of water. Do not crush or chew.
• If you miss a dose, take it as soon as you remember, provided your next scheduled dose is not due soon. If it is nearly time for your next dose, skip the missed dose and continue with your normal schedule. Do not take two doses at the same time.
• Never stop taking carvedilol suddenly without medical advice. Abrupt withdrawal can cause a serious worsening of your condition, particularly in heart failure and angina. Your prescriber will advise on a gradual reduction if treatment needs to be stopped.

Carvedilol tablets are available in four strengths through this service. The appropriate dose will be determined by your prescriber based on the condition being treated, your heart rate, blood pressure, kidney and liver function, and clinical response.

Carvedilol 3.125mg Tablets

The 3.125mg tablet is the starting dose for heart failure. In stable chronic heart failure, carvedilol must be initiated at 3.125mg twice daily and the dose doubled at intervals of no less than two weeks only if the previous dose is well tolerated. This very cautious approach is essential because the failing heart is sensitive to sudden changes in sympathetic blockade. The 3.125mg strength is not typically used as a starting dose for hypertension or angina in most adults.

Carvedilol 6.25mg Tablets

The 6.25mg tablet is the standard starting dose for hypertension and angina in adults. For hypertension, treatment typically begins at 6.25mg twice daily for two days, then increased to 12.5mg twice daily if tolerated. The 6.25mg strength is also used as a titration step in heart failure dose escalation, following the initial 3.125mg starting dose.

Carvedilol 12.5mg Tablets

The 12.5mg tablet is a maintenance dose used in both hypertension and angina, and is an intermediate step in heart failure titration. For hypertension, 12.5mg twice daily may provide adequate blood pressure control for some patients. For angina, 12.5mg to 25mg twice daily is the usual maintenance range. In heart failure, 12.5mg twice daily is a titration target on the way to the maximum of 25mg twice daily.

Carvedilol 25mg Tablets

The 25mg tablet is the maximum dose for hypertension and angina, and the target maintenance dose in heart failure (for patients weighing more than 85 kg, the maximum heart failure dose is 50mg twice daily, though this requires specialist assessment). For hypertension, the maximum recommended dose is 25mg twice daily. All dose adjustments are made by your prescriber. Do not increase your dose without medical advice.

Like all medicines, carvedilol can cause side effects, although not everyone experiences them. The information below is based on the current UK SmPC. Refer to the Patient Information Leaflet for the full list.

Common Side Effects (may affect up to 1 in 10 people)

• Dizziness and postural hypotension (a fall in blood pressure when standing up) - more likely at the start of treatment or after a dose increase, particularly in heart failure patients. Taking carvedilol with food reduces this risk.
• Headache, particularly at the start of treatment.
• Fatigue and tiredness.
• Bradycardia (a slow heart rate).
• Cold or numb hands and feet.
• Gastrointestinal effects such as nausea, vomiting, diarrhoea, or abdominal pain.
• Fluid retention or worsening oedema, particularly in heart failure patients during dose increases.

Uncommon Side Effects (may affect up to 1 in 100 people)

• Sleep disturbance, including vivid dreams or nightmares.
• Low mood or depression.
• Dry eyes or visual disturbances.
• Skin rash or itching.
• Worsening of peripheral artery disease symptoms such as leg pain on walking.
• Raised blood glucose or impaired glucose tolerance, which may affect diabetic patients.

Serious Side Effects: Seek Urgent Medical Attention

Contact your prescriber or go to your nearest accident and emergency department promptly if you experience any of the following:

• A very slow or significantly irregular heartbeat, or sudden severe breathlessness.
• Worsening breathlessness or wheeze, particularly if you have any respiratory condition.
• Signs of worsening heart failure such as rapidly increasing breathlessness, significant ankle or leg swelling, or rapid weight gain due to fluid retention.
• Severe dizziness or fainting, which may indicate a significant fall in blood pressure.
• Signs of a serious allergic reaction, such as sudden swelling of the face, lips, tongue, or throat; difficulty breathing; or a severe skin reaction.

Report any suspected side effect to your prescriber or pharmacist or via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk.

Carvedilol Tablets May Be Suitable If You:

• Are an adult with mild to moderate essential hypertension and have been assessed as suitable for beta-blocker therapy.
• Have stable angina pectoris and require treatment to reduce the frequency and severity of episodes.
• Have stable mild-to-severe chronic heart failure and are being managed as an adjunct to standard therapy, including ACE inhibitors or ARBs, diuretics, and where appropriate, digitalis.
• Are already prescribed carvedilol and require a repeat prescription through an online prescribing service.

Carvedilol Tablets Are Not Suitable If You:

• Have asthma or a history of bronchospasm - Carvedilol is a non-selective beta-blocker and is contraindicated in patients with asthma.
• Have acute decompensated heart failure requiring intravenous inotropic therapy.
• Have a second- or third-degree heart block (unless you have a functioning pacemaker).
• Have sick sinus syndrome or sinoatrial block.
• Have severe bradycardia (resting heart rate below 50 beats per minute before treatment).
• Have cardiogenic shock.
• Have severe liver impairment.
• Have severe peripheral artery disease or severely symptomatic Raynaud's phenomenon.
• Have untreated phaeochromocytoma.
• Have metabolic acidosis.
• Have a known allergy or hypersensitivity to carvedilol or any excipient in the SmPC.
• Are under 18 years of age (this service is for adults only).

Cautions

Carvedilol should be used with caution in patients with COPD, as it is a non-selective beta blocker and may worsen airway obstruction in some patients, though the risk is slightly lower with carvedilol than with older non-selective agents due to its vasodilatory properties. Caution is also required in patients with diabetes, as carvedilol can mask some symptoms of hypoglycaemia and may impair glucose tolerance. Patients with first-degree heart block, psoriasis, or peripheral artery disease should also be assessed carefully before starting treatment. Carvedilol undergoes significant liver metabolism and is contraindicated in severe liver impairment.

Important Drug Interactions

Carvedilol can interact with a number of commonly prescribed medicines. Tell your prescriber about all medicines you take, including over-the-counter products and herbal supplements. The following interactions are of particular clinical importance:

• Calcium channel blockers of the verapamil or diltiazem type: combining these with carvedilol can cause a significant and potentially dangerous slowing of the heart rate and marked reduction in blood pressure. This combination is generally contraindicated unless under close specialist supervision.
• Digoxin: carvedilol increases digoxin levels by approximately 15 per cent. Digoxin levels should be monitored when carvedilol is started or when the dose is changed.
• Antidiabetic medicines including insulin: carvedilol can enhance the blood glucose lowering effect and may mask some symptoms of hypoglycaemia. Blood glucose monitoring is particularly important in diabetic patients.
• Antihypertensive medicines and medicines that lower blood pressure as a side effect: the blood pressure lowering effect of carvedilol may be enhanced.
• Clonidine: if both carvedilol and clonidine are to be stopped, carvedilol should be withdrawn several days before clonidine to avoid a rebound rise in blood pressure.
• CYP2D6 inhibitors such as fluoxetine, paroxetine, and quinidine: these can increase carvedilol blood levels and the risk of side effects.
• Rifampicin: this can significantly reduce carvedilol levels, reducing its effectiveness.

This is not a complete list of interactions. Your prescriber will carry out a full clinical assessment, including a review of your current medicines, before any prescription is considered.

Carvedilol is a prescription-only medicine. The clinical consultation is the essential first step. A prescription will only be issued if a registered prescriber determines, based on their individual assessment of your circumstances, that carvedilol is clinically appropriate for you.

During your online consultation with Pharmacy Planet, a registered prescriber will review your clinical information. This includes your blood pressure readings or cardiac history, current heart rate, liver function, current medicines, and relevant medical conditions, including any history of asthma, COPD, diabetes, or peripheral artery disease. For patients with heart failure, the prescriber will also assess whether adequate clinical oversight is in place to support safe dose titration.

Not all consultations will result in a prescription being issued. The prescriber may recommend a different dose, a different medicine, or suggest that a face-to-face appointment with your GP or cardiologist is more appropriate. This process is designed to ensure your safety.

If you are already being managed for hypertension, angina, or heart failure by your GP or a hospital team, please keep them informed of all medicines you are taking, including any prescribed through online services.

• Store below 30°C.
• Store in the original packaging to protect from light and moisture.
• Keep out of the sight and reach of children.
• Do not use after the expiry date printed on the packaging.
• Do not dispose of medicines via household waste or wastewater. Return unused or out-of-date tablets to your pharmacist for safe disposal.

Full storage instructions are provided in the Patient Information Leaflet supplied with your medicine.

The table below compares beta blocker tablets available at Pharmacy Planet. Beta blockers reduce heart rate and cardiac output to lower blood pressure. They differ in cardioselectivity, additional properties, and licensed indications.

Important: This comparison is for general information only and does not replace medical advice. A prescriber will decide which treatment is suitable for you following an online consultation.

Pharmacy Planet is a GPhC-registered online pharmacy providing prescription medicines through a clinically led consultation process. Our registered prescribers and pharmacists are committed to patient safety, responsible prescribing, and accurate patient information. Our pharmacy team is available to answer questions about carvedilol, beta-blocker therapy, or cardiovascular health more broadly.

References

1. Electronic Medicines Compendium (eMC). Carvedilol 3.125mg, 6.25mg, 12.5mg and 25mg Tablets — Summary of Product Characteristics. https://www.medicines.org.uk/emc. Accessed August 2026.
2. National Institute for Health and Care Excellence (NICE). Chronic heart failure in adults: diagnosis and management. NICE guideline NG106. https://www.nice.org.uk/guidance/ng106. Accessed August 2026.
3. National Institute for Health and Care Excellence (NICE). Hypertension in adults: diagnosis and management. NICE guideline NG136. https://www.nice.org.uk/guidance/ng136. Accessed August 2026.
4. NHS. Carvedilol. https://www.nhs.uk/medicines/carvedilol. Accessed August 2026.
5. Joint Formulary Committee. British National Formulary (BNF). Carvedilol. BMJ Group and Pharmaceutical Press. https://bnf.nice.org.uk. Accessed August 2026.
6. Medicines and Healthcare products Regulatory Agency (MHRA). Yellow Card — report a side effect. https://yellowcard.mhra.gov.uk. Accessed August 2026.