side by side comparison

Calcium Channel Blockers: Dihydropyridine vs Non-Dihydropyridine — Vascular vs Cardiac Selectivity

Both subclasses block calcium channels, but picking the wrong one changes the clinical outcome entirely. Giving verapamil to a patient already on a beta-blocker can trigger fatal bradycardia and heart block — a combination you'd never worry about with amlodipine. The NCLEX tests whether you know which CCB hits vessels and which hits the heart.

Comparison

Side-by-side2 compared
Dimension
Dihydropyridines
Non-Dihydropyridines
Class & mechanism
  • Vascular-selective CCB → arterial vasodilation
  • Cardiac-selective CCB → ↓ HR, contractility, AV
Indications
  • Hypertension, angina
  • -dipines (amlodipine, nifedipine)
  • Hypertension, angina
  • ★Rate control of SVT & atrial fibrillation
Route & agents
  • PO; amlodipine long-acting, nifedipine
  • PO/IV; verapamil, diltiazem
Key assessment
  • Monitor blood pressure & heart rate
  • Assess for peripheral edema
  • Monitor blood pressure & heart rate
  • Hold if bradycardic (HR < 60)
Monitoring
  • BP response; watch reflex tachycardia
  • ECG; PR interval & AV conduction
Adverse effects
  • ★Peripheral edema
  • Flushing, headache, reflex tachycardia
  • Bradycardia, AV block
  • Constipation (verapamil)
Toxicity & safety
  • Overdose → hypotension, reflex tachycardia
  • Overdose → bradycardia, heart block, shock
Contraindications & interactions
  • Generally safe with normal heart rate
  • ★Contraindicated: HFrEF, 2nd/3rd-degree AV block
  • Avoid with beta blockers (additive bradycardia)
Patient teaching
  • Avoid grapefruit juice (↑ drug levels)
  • Report swelling of ankles or feet
  • Avoid grapefruit juice (↑ drug levels)
  • Do not stop abruptly; increase fluids/fiber
Class & mechanism

Dihydropyridines

  • Vascular-selective CCB → arterial vasodilation

Non-Dihydropyridines

  • Cardiac-selective CCB → ↓ HR, contractility, AV
Indications

Dihydropyridines

  • Hypertension, angina
  • -dipines (amlodipine, nifedipine)

Non-Dihydropyridines

  • Hypertension, angina
  • ★Rate control of SVT & atrial fibrillation
Route & agents

Dihydropyridines

  • PO; amlodipine long-acting, nifedipine

Non-Dihydropyridines

  • PO/IV; verapamil, diltiazem
Key assessment

Dihydropyridines

  • Monitor blood pressure & heart rate
  • Assess for peripheral edema

Non-Dihydropyridines

  • Monitor blood pressure & heart rate
  • Hold if bradycardic (HR < 60)
Monitoring

Dihydropyridines

  • BP response; watch reflex tachycardia

Non-Dihydropyridines

  • ECG; PR interval & AV conduction
Adverse effects

Dihydropyridines

  • ★Peripheral edema
  • Flushing, headache, reflex tachycardia

Non-Dihydropyridines

  • Bradycardia, AV block
  • Constipation (verapamil)
Toxicity & safety

Dihydropyridines

  • Overdose → hypotension, reflex tachycardia

Non-Dihydropyridines

  • Overdose → bradycardia, heart block, shock
Contraindications & interactions

Dihydropyridines

  • Generally safe with normal heart rate

Non-Dihydropyridines

  • ★Contraindicated: HFrEF, 2nd/3rd-degree AV block
  • Avoid with beta blockers (additive bradycardia)
Patient teaching

Dihydropyridines

  • Avoid grapefruit juice (↑ drug levels)
  • Report swelling of ankles or feet

Non-Dihydropyridines

  • Avoid grapefruit juice (↑ drug levels)
  • Do not stop abruptly; increase fluids/fiber

★ marks the fact that sets a column apart.

Clinical Pearl

If the name ends in "-dipine," it drops BP (vessels); no "-dipine" means it drops HR (heart).

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Component Topics

Dihydropyridine CCBsNon-Dihydropyridine CCBs
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