Carvedilol
Carvedilol is a beta-blocker used to treat high blood pressure and heart failure. It works by blocking certain natural substances in the body, such as epinephrine, from affecting the heart and blood vessels.
About Carvedilol
Carvedilol is a non-selective beta-blocker with alpha-1 adrenergic blockade also sold under brand names including Coreg and Coreg CR. It is primarily used to is prescribed to treat: • High blood pressure (hypertension) • Chronic heart failure • Left ventricular dysfunction after heart attack • Cardiomyopathy It helps the heart pump more efficiently, lowers blood pressure, and reduces strain on the cardiovascular system. Carvedilol is available in immediate-release oral tablet (3.125 mg, 6.25 mg, 12.5 mg, 25 mg) and extended-release oral capsule (10 mg, 20 mg, 40 mg, 80 mg) form. Healthcare providers commonly prescribe Carvedilol for conditions including Asthma, Attention Deficit Hyperactivity Disorder (ADHD), Cardiomyopathy, and Chronic Obstructive Pulmonary Disease (COPD).
Carvedilol at a Glance
- Brand names
- Coreg, Coreg CR
- Drug class
- Non-Selective Beta-Blocker with Alpha-1 Adrenergic Blockade
- Pregnancy category
- FDA Category Category C — Animal studies have shown adverse fetal effects at maternally toxic doses. There are no adequate and well-controlled studies in pregnant women. Beta-blockers used in late pregnancy may cause fetal bradycardia, hypoglycemia, and intrauterine growth restriction. Use only if the potential benefit justifies the potential risk.
- Available forms
- Immediate-release oral tablet (3.125 mg, 6.25 mg, 12.5 mg, 25 mg), Extended-release oral capsule (10 mg, 20 mg, 40 mg, 80 mg)
- Therapeutic categories
- Cardiovascular, Beta-Blockers, Heart Failure, Hypertension
- Conditions treated
- 10 related conditions on this site
What Carvedilol Is Used For
is prescribed to treat:
• High blood pressure (hypertension) • Chronic heart failure • Left ventricular dysfunction after heart attack • Cardiomyopathy
It helps the heart pump more efficiently, lowers blood pressure, and reduces strain on the cardiovascular system.
Dosage Quick Reference
These are general dosage guidelines for Carvedilol. Your doctor will determine the appropriate dose for your specific situation.
| Condition | Starting Dose | Maintenance Dose |
|---|---|---|
| Heart failure (NYHA Class II–IV) | 3.125 mg twice daily for 2 weeks | Double dose every 2 weeks as tolerated; target 25 mg twice daily (50 mg twice daily if > 85 kg) |
| Left ventricular dysfunction post-MI | 6.25 mg twice daily | Increase to 25 mg twice daily as tolerated |
| Hypertension (immediate-release) | 6.25 mg twice daily | Titrate at 7–14 day intervals; max 50 mg/day in divided doses |
| Hypertension (extended-release) | 20 mg once daily | Titrate at 7–14 day intervals; max 80 mg once daily |
Side Effects
Common side effects may include:
• Dizziness or lightheadedness • Fatigue or tiredness • Low blood pressure • Slow heart rate (bradycardia) • Diarrhea • Weight gain • Shortness of breath
Serious side effects (seek immediate medical attention):
• Severe dizziness or fainting • New or worsening heart failure symptoms • Very slow heartbeat • Severe allergic reactions • Difficulty breathing or wheezing • Swelling of legs, ankles, or feet • Unusual weight gain • Chest pain
See also: Drug Interactions ↓
Drug Interactions
Carvedilol blocks beta-1, beta-2, and alpha-1 adrenergic receptors and is metabolized primarily by CYP2D6 and CYP2C9.
- Strong CYP2D6 inhibitors (e.g., paroxetine, fluoxetine, quinidine, bupropion): Increase carvedilol exposure, particularly the R(+) enantiomer responsible for beta-blockade. Monitor for excessive bradycardia and hypotension; dose reduction may be needed.
- Calcium channel blockers (verapamil, diltiazem): Additive negative inotropic and chronotropic effects, with risk of severe bradycardia, AV block, and heart failure exacerbation. Monitor ECG and blood pressure closely; avoid combination if possible.
- Insulin and oral hypoglycemics: Carvedilol may potentiate blood-glucose-lowering effects and mask early symptoms of hypoglycemia (tachycardia, tremor). Patients with diabetes should monitor blood glucose more frequently.
- Clonidine: Concurrent use enhances blood-pressure-lowering effects. If discontinuing both, taper clonidine first to avoid rebound hypertension.
- Digoxin: Carvedilol increases digoxin plasma concentrations by approximately 15 percent. Monitor digoxin levels, particularly during initiation or dose changes.
- NSAIDs (e.g., ibuprofen, naproxen): May reduce the antihypertensive effect of carvedilol through sodium and water retention. Use the lowest effective dose for the shortest duration.
See also: Questions to Ask Your Doctor ↓
Key Considerations
Known drug interactions
Carvedilol has documented interactions with other medications, supplements, and certain foods. Review the Drug Interactions section below and tell your healthcare provider about every medication you take, including over-the-counter products. Jump to section →
Multiple forms available
Carvedilol comes in more than one form (Immediate-release oral tablet (3.125 mg, 6.25 mg, 12.5 mg, 25 mg), Extended-release oral capsule (10 mg, 20 mg, 40 mg, 80 mg)). The right form for you depends on your condition, ease of use, and your provider's recommendation.
Additional Information
What is ?
Carvedilol is a medication that belongs to a class of drugs called beta-blockers. Unlike traditional beta-blockers, carvedilol also has alpha-blocking properties, making it a non-selective beta-blocker with vasodilating effects. It is widely used to treat hypertension and heart failure.
How Does Carvedilol Work?
Carvedilol has a unique dual mechanism of action:
Beta-Blocking Effects:
- Blocks beta-1 receptors in the heart, reducing heart rate and contractility
- Decreases cardiac output and reduces oxygen demand
- Lowers blood pressure
Alpha-Blocking Effects:
- Blocks alpha-1 receptors in blood vessels
- Causes vasodilation (widening of blood vessels)
- Further reduces blood pressure and afterload on the heart
Additional Effects:
- Antioxidant properties that may protect heart tissue
- Reduces harmful remodeling of the heart in heart failure
- Improves survival in patients with heart failure
Common Uses
Carvedilol is prescribed for:
- Hypertension: Effective blood pressure control, often used in combination with other medications
- Heart Failure: Improves symptoms, reduces hospitalizations, and improves survival
- Post-Myocardial Infarction: Protects the heart after a heart attack, especially with left ventricular dysfunction
- Cardiomyopathy: Helps manage various forms of heart muscle disease
Dosage and Administration
Carvedilol should be taken exactly as prescribed:
- Usually taken twice daily with food to slow absorption and reduce side effects
- Starting dose is typically low (3.125 mg or 6.25 mg twice daily)
- Dose is gradually increased over several weeks
- Extended-release formulation (Coreg CR) is taken once daily
- Take at the same times each day
- Do not stop suddenly - must be tapered under medical supervision
- Swallow extended-release capsules whole; do not crush or chew
Important Safety Information
Who Should Not Take Carvedilol?
Avoid carvedilol if you have:
- Severe bradycardia (very slow heart rate)
- Heart block (second or third degree, without a pacemaker)
- Cardiogenic shock
- Severe liver disease
- Bronchial asthma or severe COPD
- Decompensated heart failure requiring IV inotropic therapy
- Known hypersensitivity to carvedilol
Drug Interactions
Inform your doctor about all medications, especially:
- Other blood pressure medications (may cause excessive lowering)
- Calcium channel blockers (diltiazem, verapamil) - may cause heart block
- Digoxin - carvedilol increases digoxin levels
- Insulin and diabetes medications - may mask hypoglycemia symptoms
- Clonidine - do not stop both simultaneously
- CYP2D6 inhibitors (fluoxetine, paroxetine, quinidine)
- Rifampin - decreases carvedilol effectiveness
- Cyclosporine - levels may increase
Special Populations
Diabetic Patients:
- May mask symptoms of low blood sugar (tachycardia, tremor)
- Monitor blood glucose more carefully
- Sweating from hypoglycemia is not masked
Thyroid Disease:
- May mask symptoms of hyperthyroidism
- Sudden withdrawal may precipitate thyroid storm
Peripheral Vascular Disease:
- May worsen symptoms of poor circulation
Starting and Adjusting Treatment
Titration Schedule
Carvedilol requires gradual dose increases:
For Hypertension:
- Start: 6.25 mg twice daily
- Increase every 7-14 days as tolerated
- Target: 25 mg twice daily
- Maximum: 50 mg daily
For Heart Failure:
- Start: 3.125 mg twice daily
- Double dose every 2 weeks as tolerated
- Target: 25-50 mg twice daily (depending on weight)
- Titration must be done carefully under medical supervision
Monitoring and Follow-Up
Your doctor will monitor:
- Blood pressure (standing and sitting to check for orthostatic hypotension)
- Heart rate
- Heart failure symptoms (shortness of breath, swelling, weight)
- Liver function tests
- Kidney function
- Blood glucose (in diabetic patients)
- Weight (daily self-monitoring for heart failure patients)
Managing Side Effects
Dizziness and Low Blood Pressure
- Rise slowly from sitting or lying positions
- Take medication with food
- Stay well hydrated
- Avoid alcohol
- Most common when starting or increasing dose
Fatigue
- Usually improves with time
- Take medication at bedtime if approved by doctor
- Maintain good sleep habits
- Exercise as tolerated
Lifestyle Considerations
To optimize treatment with carvedilol:
- Take medication with food to reduce side effects
- Maintain a low-sodium diet for blood pressure and heart failure
- Monitor weight daily if you have heart failure
- Limit alcohol consumption
- Avoid sudden position changes
- Continue prescribed exercise programs
- Manage stress
- Don't skip doses
Discontinuation
⚠️ NEVER stop carvedilol suddenly without medical supervision. Abrupt discontinuation can cause:
- Rebound hypertension
- Worsening angina
- Heart attack
- Dangerous arrhythmias
- Worsening heart failure
If discontinuation is necessary, your doctor will gradually taper the dose over 1-2 weeks.
When to Contact Your Doctor
Seek immediate medical attention if you experience:
- Severe dizziness or fainting
- Very slow heartbeat (less than 50 beats per minute at rest)
- Chest pain or pressure
- Sudden weight gain (2-3 pounds in a day or 5 pounds in a week)
- Increased shortness of breath
- Swelling of legs, ankles, or abdomen
- Wheezing or difficulty breathing
- Signs of liver problems (yellowing of skin/eyes, dark urine)
- New or worsening fatigue
Long-Term Benefits
Clinical studies have demonstrated that carvedilol:
- Reduces mortality in heart failure patients by 35%
- Decreases hospitalizations for heart failure
- Improves quality of life and exercise tolerance
- Reduces the risk of sudden cardiac death
- Provides cardiovascular protection after heart attack
- Effectively controls blood pressure with once or twice daily dosing
Storage
Store carvedilol at room temperature (77°F/25°C) with brief excursions permitted to 59-86°F (15-30°C). Protect from moisture. Keep in original container away from light. Keep out of reach of children and pets.
Disclaimer: This information is for educational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment. Always consult your physician or other qualified healthcare provider with any questions about a medical condition or medication.
Frequently Asked Questions
Questions to Ask Your Doctor About Carvedilol
Consider discussing these topics at your next appointment:
- How will I know if carvedilol is improving my heart function?
- What blood pressure and heart rate readings should prompt me to call you?
- Are there any of my current medications that interact with carvedilol?
- How will we coordinate my carvedilol with my diabetes management, if applicable?
- What is the plan if I cannot tolerate the target dose?
Medical Disclaimer: This information is for educational purposes only and should not be considered medical advice. Always consult with your healthcare provider before starting, stopping, or changing any medication. Your doctor can provide personalized recommendations based on your specific health condition and medical history.