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.
Master this comparison — play it or drill it.
Practice 14 NCLEX-style questions
Practice nowComparison
- Vascular-selective: arterial vasodilation
- Cardiac-selective: ↓ HR + AV conduction
- Hypertension, angina
- Raynaud phenomenon
- Hypertension, angina
- ★Rate control: AFib, SVT
- Name ends in -dipine
- Amlodipine, nifedipine
- IV diltiazem for acute AFib rate
- Verapamil, diltiazem
- Monitor blood pressure & heart rate
- Assess for peripheral edema
- Monitor blood pressure & heart rate
- Hold if bradycardic (HR < 60)
- Watch for reflex tachycardia
- ECG: PR interval, AV block
- ★Peripheral edema
- Flushing, headache, reflex tachycardia
- Bradycardia, AV block
- Constipation (verapamil)
- Overdose: hypotension + reflex tachycardia
- Overdose tx: IV calcium
- Overdose: bradycardia, heart block, shock
- Overdose tx: IV calcium
- Avoid IR nifedipine in acute MI
- ★Avoid: HFrEF, 2nd/3rd-degree AV block
- + Beta blocker → additive bradycardia
- Avoid grapefruit juice (↑ drug levels)
- Report swelling of ankles or feet
- Do not stop abruptly
- Avoid grapefruit juice (↑ drug levels)
- Do not stop abruptly
- ↑ Fluids/fiber for constipation
Dihydropyridines
- Vascular-selective: arterial vasodilation
Non-Dihydropyridines
- Cardiac-selective: ↓ HR + AV conduction
Dihydropyridines
- Hypertension, angina
- Raynaud phenomenon
Non-Dihydropyridines
- Hypertension, angina
- ★Rate control: AFib, SVT
Dihydropyridines
- Name ends in -dipine
- Amlodipine, nifedipine
Non-Dihydropyridines
- IV diltiazem for acute AFib rate
- Verapamil, diltiazem
Dihydropyridines
- Monitor blood pressure & heart rate
- Assess for peripheral edema
Non-Dihydropyridines
- Monitor blood pressure & heart rate
- Hold if bradycardic (HR < 60)
Dihydropyridines
- Watch for reflex tachycardia
Non-Dihydropyridines
- ECG: PR interval, AV block
Dihydropyridines
- ★Peripheral edema
- Flushing, headache, reflex tachycardia
Non-Dihydropyridines
- Bradycardia, AV block
- Constipation (verapamil)
Dihydropyridines
- Overdose: hypotension + reflex tachycardia
- Overdose tx: IV calcium
Non-Dihydropyridines
- Overdose: bradycardia, heart block, shock
- Overdose tx: IV calcium
Dihydropyridines
- Avoid IR nifedipine in acute MI
Non-Dihydropyridines
- ★Avoid: HFrEF, 2nd/3rd-degree AV block
- + Beta blocker → additive bradycardia
Dihydropyridines
- Avoid grapefruit juice (↑ drug levels)
- Report swelling of ankles or feet
- Do not stop abruptly
Non-Dihydropyridines
- Avoid grapefruit juice (↑ drug levels)
- Do not stop abruptly
- ↑ Fluids/fiber for constipation
★ marks the fact that sets a column apart.
Tap the column each item belongs to — jump in and play, or just watch it run.
Play full screen for XPClinical Pearl
If the name ends in "-dipine," it drops BP (vessels); no "-dipine" means it drops HR (heart).
Component Topics
Ready to master this comparison?
Get a personalized study plan built around this topic — free to try, no card needed.
Go further
- TopicDihydropyridine CCBsA calcium channel blocker that drops blood pressure without slowing the heart — until reflex tachycardia kicks in and mimics the problem you're trying to prevent.
- TopicNon-Dihydropyridine CCBsNot all calcium channel blockers target blood vessels — verapamil and diltiazem slow the heart itself. Confusing them with amlodipine on the NCLEX can cost you the question.
- Guide94 Million Alaris IV Sets Recalled. The Trouble Zone: Under 1 mL/hFDA's October update says some BD Alaris sets perform worse than BD disclosed, mostly at low rates and small boluses. What's new and what to do.
- GuideExplain It Simply: The Three-Sentence Fix for a Missed Nursing QuestionWhen you missed a question because of one fact, you need the fact, why it decides the question, and the trap. How NurseSavvy’s Explain simply mode does it in 50 words, with a real example.