Nicardipine Capsules: 7 Key Facts About Cardene
Comprehensive guide to Nicardipine capsules (Cardene) for hypertension and angina management, including dosage, side effects, and precautions.
Nicardipine capsules, sold under the brand name Cardene, belong to a group of medicines called calcium channel blockers. They are primarily used to treat high blood pressure (hypertension) and chest pain due to angina. By relaxing and widening blood vessels, Nicardipine improves blood flow, reduces the heart’s workload, and helps prevent complications like heart attacks, strokes, or kidney damage.
About nicardipine capsules
Nicardipine is a dihydropyridine calcium channel blocker that inhibits the influx of calcium ions into cardiac and vascular smooth muscle cells. This action relaxes blood vessels without altering serum calcium levels, leading to vasodilation, lowered blood pressure, and relief from angina symptoms. Unlike some other calcium blockers, it has minimal effects on heart conduction but can influence heart rate in certain patients.
Available as immediate-release capsules (20 mg, 30 mg) and sustained-release (Cardene SR) formulations, Nicardipine is typically taken orally three times daily for standard capsules or twice daily for SR versions. It is also available intravenously for short-term hypertension management when oral therapy is not feasible. The medication is extensively metabolized by the liver, so plasma levels can be higher in patients with hepatic impairment.
Key facts
- Drug class: Calcium channel blocker (dihydropyridine type).
- Starting dose for hypertension: 20 mg three times daily; may increase to 30-40 mg three times daily.
- Starting dose for angina: 20 mg three times daily; adjustable up to 40 mg three times daily.
- Extended-release (SR): 30 mg twice daily, up to 60 mg twice daily.
- Time to effect: Blood pressure reduction within 1-2 hours; full steady-state in 2-4 days.
- Common brands: Cardene, Cardene SR (generics available).
- Not suitable for: Recent heart attack, severe heart failure without monitoring, or known hypersensitivity.
About high blood pressure
High blood pressure, or hypertension, forces the heart and arteries to work harder, potentially leading to vessel damage in the brain, heart, and kidneys. Untreated, it raises risks of stroke, heart failure, kidney failure, and heart attacks. Nicardipine lowers blood pressure by dilating peripheral arteries, reducing afterload on the heart. Clinical studies show it effectively controls hypertension, with sustained effects during increased oxygen demand.
About angina
Angina is chest pain from reduced blood flow to the heart muscle, often due to coronary artery disease. Nicardipine eases this by widening coronary and peripheral vessels, improving oxygen supply and reducing myocardial workload. It enhances systolic shortening in both normal and hypokinetic heart segments, as confirmed by radionuclide angiography. However, some patients may experience increased angina frequency, possibly due to coronary steal or reflex tachycardia.
How and when to take nicardipine capsules
Take Nicardipine capsules exactly as prescribed, usually with or without food. Swallow whole; do not crush or chew sustained-release forms. For hypertension or angina:
| Condition | Initial Dose | Maintenance Dose | Max Dose |
|---|---|---|---|
| Hypertension (capsules) | 20 mg 3x/day | 20-40 mg 3x/day | 120 mg/day |
| Angina (capsules) | 20 mg 3x/day | 20-40 mg 3x/day | 120 mg/day |
| Cardene SR (hypertension) | 30 mg 2x/day | 30-60 mg 2x/day | 120 mg/day |
Doses should be titrated based on blood pressure response, starting low in elderly, hepatic, or renal impairment patients. If switching from IV, give first oral dose 1 hour before stopping infusion. Missed dose: Take as soon as remembered unless near next dose; do not double up.
Dosage
Adults: Begin with 20 mg three times daily for both hypertension and angina. Increase at 3-day intervals if needed. For SR, start 30 mg twice daily.
Children: Safety and efficacy not established; use determined by doctor.
Special populations:
- Hepatic impairment: Titrate slowly; plasma levels significantly higher.
- Renal impairment: Moderate (CrCl 10-55 mL/min): AUC/Cmax 2-3x higher; adjust doses. Severe: Similar to mild impairment.
- Heart failure: Use caution; negative inotropic effects possible.
- Elderly: Start at lower end due to reduced clearance.
How to take it with other medicines
Nicardipine can be combined with beta-blockers, diuretics, or ACE inhibitors for better control, but monitor for additive hypotension. Avoid abrupt beta-blocker withdrawal when starting.
Common questions about nicardipine capsules
How long does it take to work?
Peak effects in 1-2 hours; steady-state in days. Blood pressure drops gradually.
Can you drink alcohol with it?
Avoid or limit alcohol; it enhances blood pressure lowering, risking dizziness.
Is it safe in pregnancy?
Category C; animal studies show dystocia, reduced neonatal survival at high doses. Use only if benefits outweigh risks.
Does it affect fertility?
No evidence of impaired fertility in studies.
Can you drive while taking it?
May cause dizziness; avoid until effects known.
Side-effects
Most side effects are mild and improve over time. Common ones (>3%):
- Peripheral edema (swelling in legs/feet) – up to 7%.
- Headache (5-15%).
- Flushing, dizziness, palpitations.
- Nausea, fatigue.
Serious side effects (seek immediate help):
- Chest pain/worsening angina.
- Severe hypotension, fainting.
- Shortness of breath, rapid heartbeat.
- Yellowing skin/eyes (hepatic issues).
- Allergic reactions: rash, swelling.
IV-specific: Phlebitis, injection site reactions. Report persistent issues to your doctor.
Pregnancy and breastfeeding
Not recommended in pregnancy unless essential; crosses placenta, potential fetal risks including reduced birth weight. Limited data on breastfeeding; weighs risks as it excretes in milk. Consult doctor for alternatives.
Cautions
- Avoid in recent MI, severe aortic stenosis, hypotension.
- Monitor in heart failure, hepatic/renal disease.
- May increase angina in some; taper if stopping.
- Local irritation with IV use; use central line if possible.
Interactions
| Drug/Class | Effect | Advice |
|---|---|---|
| CYP3A4 inhibitors (ketoconazole, cimetidine) | Increased nicardipine levels | Reduce dose, monitor BP |
| Beta-blockers | Additive bradycardia/hypotension | Use cautiously |
| Digoxin | Increased digoxin levels | Monitor levels |
| Cyclosporine | Increased cyclosporine | Frequent monitoring |
Alternatives
- Other CCBs: Amlodipine, felodipine (longer-acting).
- ACE inhibitors: Lisinopril.
- Beta-blockers: Metoprolol for angina.
- IV options: Clevidipine for acute hypertension.
Frequently Asked Questions (FAQs)
Q: What is Nicardipine used for?
A: Nicardipine (Cardene) treats hypertension and angina by relaxing blood vessels to improve blood flow and reduce heart workload.
Q: What are the most common side effects?
A: Swelling (edema), headache, flushing, dizziness, and palpitations. Most improve with time.
Q: How should I take Cardene capsules?
A: 20-40 mg three times daily; swallow whole, titrate based on response.
Q: Is Nicardipine safe for kidneys?
A: Adjust doses in renal impairment; levels higher in moderate cases but monitor closely.
Q: Can Nicardipine cause chest pain?
A: Rarely worsens angina; seek help if chest pain occurs.
Q: What if I miss a dose?
A: Take soon as remembered; skip if near next dose. Do not double.
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References
- CARDENE IV Prescribing Information — Baxter. 2023. https://www.baxterpi.com/pi-pdf/Cardene.pdf
- Nicardipine (oral route) – Mayo Clinic — Mayo Clinic. 2024-10-01. https://www.mayoclinic.org/drugs-supplements/nicardipine-oral-route/description/drg-20071716
- Nicardipine (Cardene): Uses, Side Effects – GoodRx — GoodRx. 2025-05-15. https://www.goodrx.com/nicardipine/what-is
- CARDENE SR Label — FDA. 2016-07-28. https://www.accessdata.fda.gov/drugsatfda_docs/label/2016/020005s014lbl.pdf
- Nicardipine (Cardene) Details – WebMD — WebMD. 2025-01-10. https://www.webmd.com/drugs/2/drug-14061/cardene-oral/details
- Nicardipine – MedlinePlus — NIH. 2024-11-20. https://medlineplus.gov/druginfo/meds/a695032.html
- Nicardipine Oral Capsules – Cleveland Clinic — Cleveland Clinic. 2025-03-05. https://my.clevelandclinic.org/health/drugs/18936-nicardipine-capsules
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