Atenolol vs. Diltiazem

See how Atenolol and Diltiazem compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Atenolol is a beta-blocker and diltiazem is a calcium channel blocker, so they lower blood pressure through different mechanisms and are sometimes combined.

  • Diltiazem also treats atrial fibrillation and PSVT, uses atenolol does not have, while atenolol has a stronger track record after heart attacks.

  • Both are taken once daily for chronic use, but diltiazem also comes as an IV formulation for urgent rhythm control in hospitals.

Atenolol vs. Diltiazem Drug Summary

Atenolol

Atenolol is a beta-1 selective beta-blocker used to treat high blood pressure, angina, and to stabilize heart rhythm after a heart attack. It works by slowing the heart rate and reducing the force of each heartbeat, and it is taken as an oral tablet once daily.

Diltiazem

Diltiazem is a non-dihydropyridine calcium channel blocker used to treat high blood pressure, angina, and to control heart rate in atrial fibrillation and certain fast rhythms. It relaxes blood vessels and slows the heart, and it comes as an oral tablet, extended-release capsule, or IV injection.

Atenolol vs. Diltiazem Side Effects

Atenolol

Most common
fatigue (up to 26%)
dizziness (up to 13%)
depression (up to 12%)
cold extremities (up to 12%)

Diltiazem

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

Atenolol vs. Diltiazem Dosage

Atenolol

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 50 mg once daily At the start
Maximum dose 200 mg once daily If needed
Dose changes 2 increases As tolerated

Diltiazem

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 120-240 mg once daily Weeks 1-2
Maximum dose 540 mg once daily If needed
Dose changes 5 increases As tolerated

Atenolol vs. Diltiazem Indications

Atenolol

Atenolol is FDA-approved for high blood pressure, chronic angina, and to improve survival after a heart attack in stable patients. Doctors also prescribe it off-label for migraine prevention and tremor.

  • Hypertension

  • Angina pectoris

  • Stabilization after a heart attack

  • Off-label: migraine prevention

  • Off-label: essential tremor

Diltiazem

Diltiazem is FDA-approved for high blood pressure, chronic and vasospastic angina, and for controlling heart rate in atrial fibrillation, atrial flutter, and PSVT. Doctors also prescribe it off-label for migraine prevention and Raynaud's phenomenon.

  • Hypertension

  • Chronic stable and vasospastic angina

  • Atrial fibrillation and flutter (rate control)

  • Paroxysmal supraventricular tachycardia

  • Off-label: migraine prevention, Raynaud's

Atenolol vs. Diltiazem Pros and Cons

Atenolol

Atenolol has decades of outcome data supporting its use after a heart attack and is one of the least expensive blood pressure medications available. It is not a good fit for people with asthma, COPD, or certain heart rhythm problems.

Pros

  • One of the least expensive beta-blockers, roughly $6 to $37 a month without insurance

  • Strong evidence for improving survival after a heart attack

  • Simple once-daily oral dosing with one tablet strength progression

  • Long-standing safety record since 1981

Cons

  • Not recommended for people with asthma or COPD due to bronchospasm risk

  • Can mask warning signs of low blood sugar and hyperthyroidism

  • Requires dose adjustment in kidney impairment

  • Stopping suddenly can worsen angina or trigger a heart attack

Diltiazem

Diltiazem covers a wider range of heart rhythm problems than atenolol and comes in an IV form for urgent hospital use. It costs more on average and carries its own restrictions around slow heart rhythms and heart failure.

Pros

  • Also treats atrial fibrillation, atrial flutter, and PSVT

  • Available as IV injection for urgent rate control in the hospital

  • Does not mask low blood sugar symptoms the way beta-blockers can

  • Multiple release formulations (immediate, sustained, extended)

Cons

  • Roughly $18 to $125 a month without insurance, often costing more than atenolol

  • Contraindicated with sick sinus syndrome unless a pacemaker is in place

  • Can worsen symptoms in patients with reduced heart pump function

  • More titration steps to reach an effective maintenance dose

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