What class of medication is Procardia (verapamil)?

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Procardia is a Dihydropyridine Calcium Channel Blocker (Nifedipine)

Procardia is the brand name for nifedipine, a dihydropyridine calcium channel blocker used primarily for hypertension and angina. 1

Important Clarification

The expanded question contains an error: Procardia is NOT verapamil. These are two distinct medications within the calcium channel blocker class:

  • Procardia (nifedipine): Dihydropyridine calcium channel blocker
  • Verapamil: Non-dihydropyridine (phenylalkylamine) calcium channel blocker

Key Differences Between These Drug Classes

Procardia/Nifedipine (Dihydropyridine)

  • Primary mechanism: Peripheral vasodilation through vascular smooth muscle calcium channel blockade 1
  • Cardiovascular effects: Decreases systemic vascular resistance and blood pressure; minimal direct cardiac effects 1
  • Does NOT significantly affect: SA node function, AV conduction, or heart rate in clinical use 1
  • Main uses: Hypertension and stable angina 1

Verapamil (Non-dihydropyridine)

  • Primary mechanism: Affects both vascular smooth muscle AND cardiac tissue (SA/AV nodes) 2
  • Cardiovascular effects: Slows AV nodal conduction, negative inotropic effects, AND vasodilation 2, 3
  • Main uses: Supraventricular tachycardia, rate control in atrial fibrillation, hypertension, angina 2, 4

Clinical Implications

This distinction is critical because these medications have different contraindications and clinical applications:

  • Procardia/nifedipine can be used in patients with AV block or bradycardia (no significant nodal effects) 1
  • Verapamil is contraindicated in AV block >1st degree, SA node dysfunction, decompensated heart failure, and should not be combined with beta-blockers in many situations 2

Metabolism and Drug Interactions

Both medications are CYP3A4 substrates, but this is particularly relevant for nifedipine:

  • Strong CYP3A4 inhibitors (ketoconazole, clarithromycin, grapefruit juice) increase nifedipine exposure significantly 1
  • Strong CYP3A4 inducers (rifampin, phenytoin, carbamazepine) are contraindicated with nifedipine 1
  • Dose adjustment required when initiating with CYP3A4 inhibitors 1

Common Pitfall

Do not confuse Procardia (nifedipine) with verapamil or diltiazem. Only the non-dihydropyridines (verapamil, diltiazem) have significant antiarrhythmic properties and AV nodal blocking effects. Nifedipine is purely a vasodilator without clinically significant cardiac conduction effects.

References

4
Research

Verapamil in arrhythmia.

British journal of clinical pharmacology, 1986

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