Carvedilol

What is carvedilol?

Carvedilol is a prescription-only beta-blocker used to treat various heart-related conditions. It works by slowing the heart rate and relaxing blood vessels, which helps reduce the heart’s workload and improve circulation. This can help manage high blood pressure and heart failure and reduce the risk of further heart problems after a heart attack[1]. 

What is carvedilol used for?

Carvedilol is prescribed to help manage or prevent several cardiovascular conditions, including[1]: 

• High blood pressure (hypertension) 

• Heart failure 

• Strokes 

• Angina (chest pain) 

• Long-term management after a heart attack to improve survival 

How does carvedilol work?

Carvedilol works in two main ways to support heart and blood vessel health. It blocks beta receptors in the heart, slowing the heart rate and reducing how hard the heart has to work. It also blocks alpha-1 receptors in blood vessels, helping them to relax and widen, which lowers blood pressure. This combined effect reduces strain on the heart and helps prevent future cardiovascular events[1]. 

Who can take carvedilol?

Carvedilol is suitable for many adults, but it may not be appropriate for everyone. It may not be suitable if you[1]: 

• Have asthma or severe chronic lung disease 

• Have liver disease  

• Have very low blood pressure 

• Have certain types of irregular heart rhythms 

• Have severe peripheral circulatory problems (e.g., severe Raynaud’s or peripheral arterial disease) 

• Are allergic to carvedilol or any of its ingredients 

Please tell your doctor or pharmacist about any conditions you may have or medication you take before you start treatment, and always follow the instructions in the Patient Information Leaflet[2].  

What is the typical dosage of carvedilol?

Carvedilol tablets come in 4 different strengths: 3.125mg, 6.25mg, 12.5mg and 25mg. Your dose will depend on the condition being treated[1]: 

• High blood pressure – 12.5mg once a day for 2 days, increasing to 25mg, taken once a day. Your dose may be increased up to 50mg a day if your blood pressure does not come down enough, taken as a single dose or split into 2 doses 

• Heart failure – 3.125mg, taken twice a day for 2 weeks, increasing every 2 weeks up to a maximum of 25mg to 50mg twice a day (depending on your weight) 

• Angina – 12.5mg, taken twice a day for 2 days, increasing to 25mg, taken twice a day 

If your child is prescribed carvedilol, the doctor will work out their dose based on the child’s weight. Always follow your pharmacist or doctor's instructions exactly. 

How do you take carvedilol?

Carvedilol should be taken consistently and with care to reduce side effects. Take it with food to help reduce the risk of dizziness or fainting, swallow the tablets whole with a glass of water and try to take it at the same time each day. You may be advised to take your first dose before you go to bed as it may cause dizziness. Your subsequent doses can then be taken in the morning if it doesn’t make you feel dizzy. If you take it twice a day, have one dose in the morning and the other in the evening with 10 to 12 hours between them[1]. 

Can you stop taking carvedilol?

You should not stop taking carvedilol suddenly without medical advice. Doing so can cause your condition to worsen or lead to a spike in blood pressure. If you need to stop, your doctor will guide you in gradually reducing your dose. 

What do you do if you take too much carvedilol?

Taking too much carvedilol can be dangerous. Symptoms of overdose include[1]: 

• Very slow heart rate 

•  Low blood pressure 

• Difficulty breathing 

• Fainting 

Call 999 or go to A&E immediately if you think you’ve taken too much. 

What do you do if you forget to take carvedilol?

If you miss a dose of carvedilol, take it as soon as you remember. If it’s nearly time for your next dose, skip the missed one and do not take two doses at the same time[1]. 

What medicines can’t you take with carvedilol?

Carvedilol can interact with other medications, so it’s important to inform your doctor or pharmacist about everything you're taking. Caution is needed with[1]: 

• Other blood pressure medicines (both increase or reduce) 

• Medicines for irregular heart rhythms (e.g. amiodarone, digoxin) 

• Diabetes treatments (it can mask low blood sugar symptoms) 

• Inhalers for asthma or COPD (especially those containing beta-agonists) 

• Antidepressants such as MAO inhibitors 

• Immunosuppressants (ciclosporin) 

• NSAIDs like ibuprofen, which can reduce its effect 

• Consult your doctor before using decongestants or antihistamines. 

Always inform your doctor or pharmacist about all medications and supplements you take before you start a new medicine, and follow the instructions in the Patient Information Leaflet[2]. 

What are the side effects of carvedilol?

Like all medications, carvedilol can cause side effects. Most are mild and manageable, but some may need medical attention. The most common side effects include[1]: 

• Dizziness or light-headedness 

• Tiredness or fatigue 

• Diarrhoea 

• Cold hands or feet 

Serious, but rare side effects, include[1]: 

• Breathing difficulties 

• Swelling of the face or throat (possible allergic reaction) 

• Severe skin reactions 

• Worsening chest pain or heart failure symptoms (e.g., shortness of breath, swelling). 

• Nose bleeds lasting longer than 10 minutes 

You should contact your GP if you experience any of these symptoms. In rare cases, the medicine may cause a serious allergic reaction (anaphylaxis). You should call 999 or visit A&E immediately if you believe this is happening[1]. 

Symptoms of anaphylaxis include[1]:  

• Difficulty breathing  

• Tightness in throat and chest  

• Swelling of the tongue or throat  

• Feeling faint or dizzy  

• Blue/grey skin or lips  

• Loss of consciousness 

If you experience any side effects, including those not listed, you are encouraged to report them via the Yellow Card Scheme or contact your doctor, pharmacist, or nurse. This information is intended as a summary for general awareness and does not replace professional medical advice. 

The information provided in the side effects section is not a comprehensive list of all possible side effects associated with this medication. For a complete list of side effects, please refer to the Patient Information Leaflet (PIL) provided with your medication or consult your healthcare professional[2]. 

Frequently asked questions about carvedilol

Can I drink alcohol while taking carvedilol? 
It’s best to limit alcohol, as it may increase side effects like dizziness[1]. 

Does carvedilol cause weight gain? 
It can, particularly in people with heart failure[1]. 

Can I take painkillers with carvedilol? 
Paracetamol is usually safe. Avoid NSAIDs like ibuprofen unless advised by a doctor[1]. 

How long will I need to take carvedilol? 
Often long-term, especially if you are taking it for heart failure or to reduce your risk after a heart attack[1]. 

Does carvedilol affect sleep? 
Some people report sleep disturbances, but this is not very common[1]. 

Can I take it during pregnancy? 
Carvedilol should only be used during pregnancy if deemed necessary by your doctor, as risks and benefits must be carefully assessed. [1]. 

Is carvedilol safe for long-term use? 
Yes, if you are regularly monitored by your healthcare team[1]. Regular monitoring of blood pressure, heart rate, and kidney function is required, especially for heart failure patients. 

Can I have surgery while taking carvedilol? 
Inform your surgeon if you have surgery planned. Carvedilol can lower blood pressure when used in combination with some anaesthetics[1]. 

For the official NHS guide to carvedilol, visit their website.