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What Is Nifedipine?

Nifedipine is a prescription calcium channel blocker used to treat high blood pressure and certain types of angina. It belongs to the dihydropyridine class and works primarily by relaxing blood vessels. Nifedipine is available in immediate-release and extended-release formulations, which have different approved uses and dosing instructions. Extended-release tablets are commonly prescribed for long-term blood pressure management and selected forms of chest pain.

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What Is Nifedipine?

Nifedipine is a prescription calcium channel blocker used to treat high blood pressure and certain types of angina. It belongs to the dihydropyridine class and works primarily by relaxing blood vessels. Nifedipine is available in immediate-release and extended-release formulations, which have different approved uses and dosing instructions. Extended-release tablets are commonly prescribed for long-term blood pressure management and selected forms of chest pain.

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How Does Nifedipine Work?

Nifedipine blocks L-type calcium channels in vascular smooth muscle, reducing calcium entry into blood vessel cells. This causes arteries to relax and widen, lowering resistance to blood flow and reducing blood pressure. It can also improve blood supply to the heart by relaxing coronary arteries. Unlike certain other calcium channel blockers, nifedipine acts primarily on blood vessels rather than directly slowing electrical conduction through the heart.

What Conditions Does Nifedipine Treat?

Nifedipine is prescribed for hypertension and certain forms of angina, including chronic stable angina and vasospastic angina. Specific approved indications depend on the product formulation. It is also sometimes prescribed for other conditions outside its FDA-approved indications, such as Raynaud phenomenon. Clinicians consider blood pressure, cardiovascular history, and other medications before treatment. Immediate-release nifedipine should not be used as a routine method of rapidly lowering blood pressure because sudden reductions can be dangerous.

How Should Nifedipine Be Taken?

Nifedipine dosing depends on the formulation and condition being treated. Extended-release tablets are typically taken once daily and should be swallowed whole without crushing or chewing. Immediate-release capsules follow different dosing instructions. Certain extended-release products have specific food-related directions, so patients should follow their own prescription label. Avoid grapefruit products because they can increase nifedipine exposure. Do not change formulations or discontinue treatment without medical guidance.

What Are the Side Effects and Warnings of Nifedipine?

Common side effects include headache, flushing, dizziness, peripheral swelling, and nausea. Nifedipine can cause excessive blood pressure reduction, particularly when treatment begins or the dose increases. Some patients experience palpitations or worsening chest pain, especially during initial treatment. Gum enlargement can also occur with prolonged use. Nifedipine is contraindicated in cardiogenic shock, and certain products must not be combined with strong enzyme-inducing medications such as rifampin.

Common Questions About Nifedipine

Does nifedipine lower blood pressure?

Yes. Nifedipine relaxes arteries and reduces vascular resistance, helping lower blood pressure in people with hypertension.

Is nifedipine a beta blocker?

No. Nifedipine is a dihydropyridine calcium channel blocker. It lowers blood pressure through a different mechanism from beta blockers.

Can nifedipine cause swollen ankles?

Yes. Peripheral edema, particularly swelling around the ankles or feet, is a recognized side effect of nifedipine. Persistent or severe swelling should be evaluated.

Can nifedipine tablets be crushed?

Extended-release nifedipine tablets should not be crushed or chewed because doing so can disrupt controlled drug release. Follow the instructions for the exact formulation.

References

DailyMed - NIFEDIPINE extended-release tablet. https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=ca5b0178-4e5f-4077-ada5-7058b0a03858. Date Accessed October 19, 2026.

Nifedipine. LiverTox. https://www.ncbi.nlm.nih.gov/books/NBK548324/. Date Accessed October 19, 2026.

Nifedipine. MedlinePlus. https://medlineplus.gov/druginfo/meds/a684028.html. Date Accessed October 19, 2026.

Nifedipine. PubChem. https://pubchem.ncbi.nlm.nih.gov/compound/nifedipine. Date Accessed October 19, 2026.

Nifedipine. StatPearls. https://www.ncbi.nlm.nih.gov/books/NBK537052/. Date Accessed October 19, 2026.