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

Most common
dizziness (up to 32%)
fatigue (up to 24%)
hypotension (up to 14%)
diarrhea (up to 12%)

Diltiazem

Most common
dizziness (up to 6.4%)
fatigue (up to 4.8%)
edema lower-limb (up to 6.8%)
bradycardia (up to 3.6%)

Carvedilol vs. Diltiazem Dosage

Carvedilol

Dosage
Dosage Table
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

Dosage
Dosage Table
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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