Metoprolol vs. Diltiazem

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

Key Takeaways

  • Metoprolol is a beta-blocker and diltiazem is a calcium channel blocker, so they lower blood pressure through different mechanisms with different risks.

  • Diltiazem does not carry the breathing risks that come with metoprolol's beta-blockade, making it a common choice for people with asthma or COPD.

  • Metoprolol is FDA-approved for heart failure, while diltiazem is contraindicated in heart failure caused by reduced pumping function.

Metoprolol vs. Diltiazem Drug Summary

Metoprolol

Metoprolol succinate is a beta-1 selective beta-blocker used to treat high blood pressure, angina, and heart failure. It comes as a once-daily extended-release tablet that works by blocking adrenaline's effects on the heart.

Diltiazem

Diltiazem is a non-dihydropyridine calcium channel blocker used to treat high blood pressure, angina, and certain fast heart rhythms. It is available as once-daily extended-release tablets and as an IV formulation for rapid rate control in hospitals.

Metoprolol vs. Diltiazem Side Effects

Metoprolol

Most common
Bradycardia (up to 15.9%)
Dizziness (about 10%)
Hypotension (up to 27.4%)
Tiredness (about 10%)

Diltiazem

Most common
Bradycardia (up to 3.6%)
Dizziness (up to 6.4%)
Edema lower-limb (up to 6.8%)
Fatigue (up to 4.8%)

Metoprolol vs. Diltiazem Dosage

Metoprolol

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 12.5 mg once daily Weeks 1-2
Maximum dose 100 mg once daily Week 5 onward
Dose changes 3 increases Every 2 weeks

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

Metoprolol vs. Diltiazem Indications

Metoprolol

Metoprolol is FDA-approved for hypertension, angina, and stable heart failure across NYHA classes II through IV. Doctors also prescribe it off-label for atrial fibrillation rate control, migraine prevention, and essential tremor.

  • Hypertension (blood pressure control)

  • Angina pectoris (chest pain)

  • Heart failure, NYHA class II-IV

  • Off-label: atrial fibrillation rate control

  • Off-label: migraine prevention

Diltiazem

Diltiazem is FDA-approved for hypertension, chronic stable angina, vasospastic angina, and rate control in atrial fibrillation or flutter, as well as PSVT. It is also used off-label for migraine prevention and Raynaud's phenomenon.

  • Hypertension (blood pressure control)

  • Chronic stable angina

  • Vasospastic (Prinzmetal's) angina

  • Atrial fibrillation/flutter rate control

  • Off-label: migraine prevention

Metoprolol vs. Diltiazem Pros and Cons

Metoprolol

Metoprolol has decades of use as an inexpensive, once-daily beta-blocker with strong heart failure trial data. Its main tradeoffs are the need for gradual tapering and caution in people with asthma or COPD.

Pros

  • Also treats heart failure, unlike diltiazem which is contraindicated in it

  • One of the lowest-cost generic beta-blockers available

  • Decades of trial data supporting use in heart failure

  • Lower rate of leg swelling than diltiazem

Cons

  • Can worsen asthma or COPD symptoms due to beta-blockade

  • Requires gradual tapering; abrupt stopping can trigger chest pain or arrhythmia

  • Not safe in cardiogenic shock or decompensated heart failure

  • Higher reported rates of fatigue and low blood pressure

Diltiazem

Diltiazem offers broader rhythm-control indications and doesn't carry the breathing risks associated with beta-blockers. Its main tradeoffs are a higher chance of leg swelling and unsuitability for heart failure with reduced pumping function.

Pros

  • Also approved for vasospastic angina and PSVT, which metoprolol doesn't cover

  • Available as an IV infusion for fast rate control in acute settings

  • Does not typically worsen asthma or COPD, since it isn't a beta-blocker

  • Multiple oral release formulations allow flexible dosing

Cons

  • Can cause noticeable swelling in the lower legs

  • Not recommended for heart failure from reduced pumping function

  • More prone to interactions through CYP3A4 metabolism

  • Not approved for chronic heart failure management like metoprolol is

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