What drug class does nifedipine belong to?

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Last updated: March 25, 2026 • View editorial policy

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Nifedipine Drug Class

Nifedipine is a dihydropyridine calcium channel blocker (CCB). 1, 2, 3

Mechanism of Action

Nifedipine functions as a calcium ion influx inhibitor (also called a slow-channel blocker or calcium ion antagonist) that selectively inhibits the transmembrane influx of calcium ions into vascular smooth muscle and cardiac muscle without altering serum calcium concentrations. 3

  • The drug binds to voltage-dependent calcium channels in vascular smooth muscle, blocking calcium entry through these channels and causing arterial vasodilation. 3
  • This mechanism reduces peripheral vascular resistance and lowers arterial blood pressure through direct peripheral arterial vasodilation. 3

Classification Within Calcium Channel Blockers

There are three distinct subclasses of calcium channel blockers, each with different chemical structures and pharmacological effects: 4, 5, 6, 4

  • Dihydropyridines (such as nifedipine and amlodipine)
  • Benzothiazepines (such as diltiazem)
  • Phenylalkylamines/Phenylethylamines (such as verapamil)

Distinguishing Characteristics of Dihydropyridines

Nifedipine and other dihydropyridines produce the most marked peripheral arterial vasodilation compared to the other calcium channel blocker subclasses, whereas diltiazem has the least vasodilatory effect. 4, 5, 6, 4

  • All subclasses cause similar coronary vasodilation, but dihydropyridines are distinguished by their potent peripheral vascular effects. 4, 5, 4
  • Atrioventricular block may be induced by non-dihydropyridines (phenylalkylamines), but not typically by dihydropyridines like nifedipine. 6

Clinical Context and Important Caveats

The 2023 American Association of Clinical Endocrinology explicitly corrected a previous error that had misclassified nifedipine and amlodipine as "non-dihydropyridine" medications, confirming they are indeed dihydropyridine calcium channel blockers. 2

Safety Considerations

  • Nifedipine should not be used without concomitant beta-blocker therapy in certain acute coronary syndrome settings, as short-acting nifedipine has been associated with potential harm when used alone. 4, 5, 4
  • The drug is a substrate of CYP3A, and strong CYP3A inhibitors (such as ketoconazole, clarithromycin, grapefruit) can significantly increase nifedipine exposure. 3, 7
  • Ritonavir can increase nifedipine exposure by approximately 14-fold, necessitating dose reduction or temporary discontinuation when co-administered. 7

References

2
Guideline

american association of clinical endocrinology consensus statement: comprehensive type 2 diabetes management algorithm - 2023 update.

Endocrine practice : official journal of the American College of Endocrinology and the American Association of Clinical Endocrinologist, 2023

7
Research

Pharmacokinetic interaction between nirmatrelvir/ritonavir and nifedipine: A case report.

Journal of infection and chemotherapy : official journal of the Japan Society of Chemotherapy, 2026

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.