Carvedilol (Coreg): Uses, Warnings, and Key Facts

What is carvedilol?

Carvedilol is a medicine used for the treatment of high blood pressure, ischemic heart disease, and chronic heart failure. The product ingredient listed in the source content is carvedilol phosphate.

In the United States, carvedilol is available under brand names including Coreg and Coreg CR.

How carvedilol works

Carvedilol is described as a beta-vasodilator blocker. It blocks alpha-1 adrenoreceptors and is non-selective, with antioxidant properties. The source content also notes that it has no intrinsic sympathomimetic activity and has membrane-stabilizing properties.

Therapeutic uses listed in the source

• High blood pressure.
• Prolonged treatment of ischemic heart disease, including chronic stable angina, silent myocardial ischemia, unstable angina, and ischemic dysfunction of the left ventricle.
• Symptomatic moderate to severe chronic heart failure.

How carvedilol is taken

The source content describes oral use. It may be taken with or without food.

For heart failure, the source notes that it should be taken with food to help reduce the risk of orthostatic hypotension.

Posology information from the source

The following dosing details are included in the original content. They are presented here for reference only and should be verified against the official leaflet and a healthcare professional’s instructions.

Who should not use carvedilol according to the source

The original content lists the following contraindications:

• Hypersensitivity to the medicine.
• NYHA class IV cardiac insufficiency requiring IV inotropics.
• COPD with bronchial obstruction.
• Clinically manifest liver dysfunction.
• Bronchial asthma.
• Second- or third-degree AV block.
• Severe bradycardia.
• Cardiogenic shock.
• Sinus disease, including sinoatrial node block.
• Severe hypotension.
• Metabolic acidosis.
• Prinzmetal angina.
• Untreated pheochromocytoma.
• Severe peripheral arterial circulatory disturbances.
• Concomitant IV treatment with verapamil or diltiazem.

Warnings and precautions

The source content highlights several situations that may require extra caution or monitoring:

• Chronic heart failure treated with digitalis, diuretics, and/or ACE inhibitors.
• Diabetes mellitus, because carvedilol may mask symptoms of hypoglycemia.
• Peripheral vasculopathy and peripheral circulatory disorders such as Raynaud’s disease.
• General surgery.
• First-degree heart block.
• History of severe hypersensitivity reactions or desensitization therapy.
• Labile or secondary hypertension.
• Suspected pheochromocytoma or Prinzmetal vasospastic angina.
• History of psoriasis associated with beta-blocker therapy.
• COPD with a bronchospastic component.

In people prone to bronchospasm, the source recommends close monitoring at the start of treatment and during dose adjustment. It also notes that carvedilol may mask symptoms of thyrotoxicosis.

Heart failure, blood pressure, and kidney monitoring

The source content says that in chronic heart failure with low blood pressure, ischemic heart disease, diffuse vascular disease, and/or underlying renal failure, renal function should be monitored during dose increases. If kidney function worsens, treatment should be stopped or the dose reduced.

Liver and kidney considerations

Liver failure: The source states that carvedilol is contraindicated in clinically manifest liver dysfunction.

Renal insufficiency: Caution is advised. Kidney function should be monitored in the situations described above, especially during dose increases.

Drug interactions listed in the source

Carvedilol may interact with several medicines. The original content lists the following examples:

• Verapamil, diltiazem, and class I antiarrhythmics: increased risk of AV conduction problems; IV use is contraindicated in the source.
• Digoxin: risk of prolonged atrioventricular conduction time.
• Clonidine: effects on blood pressure and heart rate may be altered.
• Insulin and oral antidiabetics: carvedilol may potentiate their effect.
• Reserpine and MAOIs: risk of hypotension and/or severe bradycardia.
• Cyclosporine: increased concentration.
• Anaesthetics: additive negative inotropic and hypotensive effects.
• Rifampicin: decreased plasma levels.
• SSRIs, fluoxetine, paroxetine, quinidine, propafenone, cimetidine: increased plasma levels.
• NSAIDs: increased blood pressure.

If you take more than one medicine, the official leaflet and a pharmacist can help check for interaction risks.

Pregnancy and breastfeeding

Pregnancy: The source says carvedilol should not be used during pregnancy unless the expected benefits outweigh the potential risks.

Breastfeeding: The source states that carvedilol and its metabolites are excreted in breast milk in animal studies, so breastfeeding is not recommended during administration of carvedilol.

Effects on driving ability

The source notes that some people may have reduced alertness, especially at the start of treatment or when the medicine is adjusted.

Possible side effects listed in the source

The original content includes the following side effects and adverse effects:

• Headache, dizziness, fatigue, asthenia.
• Depressed mood and depression.
• Bradycardia, edema, hypervolemia, and fluid overload.
• Hypotension and postural hypotension.
• Peripheral circulation disorders, cold extremities, and worsening of intermittent claudication or Raynaud’s phenomenon.
• Peripheral edema.
• Asthma and dyspnea in predisposed patients.
• Pulmonary edema.
• Nausea, diarrhea, abdominal pain, dyspepsia, and vomiting.
• Anemia.
• Decreased tearing, eye irritation, and vision changes.
• Abnormal kidney function in patients with diffuse vascular disease or underlying kidney disease.
• Acute renal failure and urination disorders.
• Pain in the extremities, weight gain, and hypercholesterolemia.
• Worsening blood glucose control, including hyperglycemia and hypoglycemia, in patients with pre-existing diabetes.

What to verify with the official leaflet or a clinician

If you have carvedilol prescribed or are reviewing it for general information, it is useful to confirm:

• Which brand or formulation you have, such as immediate-release or extended-release.
• The exact dose and schedule written on your prescription label.
• Whether food instructions apply to your specific use.
• Whether any of your other medicines may interact with carvedilol.
• Whether your liver, kidney, blood pressure, or heart condition needs monitoring.

Safety reminder

Carvedilol can affect blood pressure, heart rate, breathing, and blood sugar control. If you notice new or worsening symptoms, or if you are unsure about a warning in your leaflet, speak with a doctor or pharmacist promptly. For urgent symptoms such as severe breathing difficulty, fainting, or chest pain, seek emergency care.

Frequently asked questions

Sources and reference points

The original content states that the information was written using clinical and molecular information from medicines authorized and marketed in the United States under the Unique Ingredient Identifier (UNII) by the FDA Substance Registration System and the United States Pharmacopeia.

For official medicine information, the FDA medication guide and product leaflet remain the most important references.