Carvedilol vs. Diltiazem
See how Carvedilol and Diltiazem compare on approved uses, dosing, side effects, and cost.
Key Takeaways
Carvedilol is a beta-blocker taken twice daily that also treats heart failure, while diltiazem is a calcium channel blocker with once-daily options for blood pressure and angina.
Both drugs can cause dizziness and fatigue, but carvedilol's rates run higher, while diltiazem more often causes leg swelling and a slowed heart rate.
Diltiazem is also FDA-approved for angina and heart rate control in atrial fibrillation, while carvedilol is approved for heart failure and reducing death risk after a heart attack.
Carvedilol vs. Diltiazem Drug Summary
Carvedilol
Carvedilol is a combined alpha- and beta-blocker approved for hypertension, chronic heart failure, and reducing cardiovascular death after a heart attack. It's taken as a tablet twice daily, ideally with food to reduce side effects.
Diltiazem
Diltiazem is a calcium channel blocker approved for hypertension, angina, and heart rate control in atrial fibrillation or flutter. It's taken as an oral tablet once daily, or given as an IV infusion for urgent rate control in a hospital.
Carvedilol vs. Diltiazem Side Effects
Carvedilol
Diltiazem
Carvedilol vs. Diltiazem Dosage
Carvedilol
Diltiazem
| STAGE | DOSE | WHEN |
| Starting dose | 3.125 mg twice daily | At the start |
| Maximum dose | 25 mg twice daily | If needed |
| Dose changes | 3 increases | As tolerated |
| STAGE | DOSE | WHEN |
| Starting dose | 120-240 mg once daily | Weeks 1-2 |
| Maximum dose | 120-240 mg once daily | Same as starting |
| Dose changes | None | Fixed dose |
Carvedilol
| STAGE | DOSE | WHEN |
| Starting dose | 3.125 mg twice daily | At the start |
| Maximum dose | 25 mg twice daily | If needed |
| Dose changes | 3 increases | As tolerated |
Diltiazem
| STAGE | DOSE | WHEN |
| Starting dose | 120-240 mg once daily | Weeks 1-2 |
| Maximum dose | 120-240 mg once daily | Same as starting |
| Dose changes | None | Fixed dose |
Carvedilol vs. Diltiazem Indications
Carvedilol
Carvedilol is FDA-approved for chronic heart failure, hypertension, and improving survival after a heart attack that has weakened the heart. Doctors often prescribe it for heart failure or post-heart-attack care even when blood pressure is already well controlled.
Chronic heart failure (mild to severe)
Essential hypertension
Left ventricular dysfunction after a heart attack
Off-label: pulmonary arterial hypertension
Diltiazem
Diltiazem is FDA-approved for hypertension, chronic stable angina, vasospastic (Prinzmetal's) angina, and controlling heart rate in atrial fibrillation, flutter, or PSVT. It's also used off-label for migraine prevention and Raynaud's phenomenon, though these uses aren't FDA-approved.
Hypertension
Chronic stable and vasospastic angina
Atrial fibrillation/flutter rate control
Paroxysmal supraventricular tachycardia (PSVT)
Carvedilol vs. Diltiazem Pros and Cons
Carvedilol
Carvedilol's biggest advantage is treating hypertension alongside heart failure and post-heart-attack risk, useful for patients with overlapping conditions. It's an inexpensive generic with decades of use, though it requires twice-daily dosing and carries higher rates of dizziness and fatigue than diltiazem.
Pros
Also treats heart failure and post-heart-attack risk
Long safety record with decades of clinical use
Taken with food, which can lessen dizziness
Cons
Requires twice-daily dosing, no once-daily option
Higher rates of dizziness and fatigue than diltiazem
Contraindicated in asthma or severe bronchospasm
Diltiazem
Diltiazem's main advantage is flexibility: it treats angina and controls heart rate in atrial fibrillation, and it comes in an IV form for urgent hospital use. Once-daily extended-release tablets are convenient, but diltiazem can cause bothersome leg swelling and isn't an option for reduced-function heart failure.
Pros
Once-daily extended-release tablet option
Also approved for angina and rate control in AFib/flutter
Available as IV for urgent in-hospital rate control
Cons
Leg swelling is a common side effect
Contraindicated with AV block or sick sinus syndrome without a pacemaker
Can worsen heart failure in patients with reduced ejection fraction
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