flecainide vs nifedipine
Side-by-side comparison of flecainide and nifedipine. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
minor Known Drug Interaction
There has been too little experience with the coadministration of flecainide acetate with nifedipine or diltiazem to recommend concomitant use.
Recommendation: Avoid using these medications together unless your doctor determines the benefits outweigh the unknown risks.
Tambocor
Procardia, Adalat
Flecainide is a medicine used to prevent irregular heartbeats. It helps your heart beat normally.
Nifedipine is a calcium channel blocker. It helps to relax blood vessels, which can lower blood pressure and reduce chest pain.
This medicine can prevent fast heart rates in the upper chambers of the heart. This includes supraventricular tachycardia and atrial fibrillation/flutter. Flecainide can also prevent life-threatening fast heartbeats in the lower chambers (ventricles). It is usually started in the hospital for these serious ventricular problems.
This medicine treats chest pain (angina) caused by tight blood vessels. It also treats high blood pressure. Lowering blood pressure reduces the risk of strokes and heart attacks.
Flecainide works by slowing down electrical signals in the heart. This helps to stabilize your heart rhythm. It belongs to a class of drugs called Class IC antiarrhythmics.
Nifedipine blocks calcium from entering heart and blood vessel cells. This relaxes and widens blood vessels. As a result, the heart doesn't have to work as hard, and blood pressure goes down.
- • Dizziness
- • Vision problems
- • Difficulty breathing
- • Headache
- • Nausea
- • Swelling, especially in the legs or ankles
- • Headache
- • Fatigue
- • Dizziness
- • Constipation
- Irregular heartbeat in the upper chambers 337
- Feeling tired 276
- Difficulty breathing 270
- Feeling lightheaded 255
- Feeling sick to your stomach 244
- Difficulty breathing 2,429
- Tiredness 2,303
- Diarrhea 2,265
- Feeling sick to your stomach 2,220
- Headache 1,996
Flecainide can increase the risk of death or cardiac arrest in some patients who have had a heart attack. It is generally not recommended for people with less serious, but unpleasant, heart rhythm problems. Flecainide is also not recommended if you have chronic atrial fibrillation.
In rare cases, nifedipine can cause serious gastrointestinal problems, including obstruction. If you experience severe abdominal pain, vomiting, or inability to pass stool, seek immediate medical attention.
Tell your doctor if you are pregnant or plan to become pregnant. It is not known if flecainide can harm an unborn baby. Talk to your doctor about the risks and benefits of taking flecainide while breastfeeding.
Tell your doctor if you are pregnant or plan to become pregnant. It is not known if nifedipine will harm your unborn baby. Talk to your doctor about the risks and benefits of taking this medicine while pregnant or breastfeeding.
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How to Read This flecainide vs nifedipine Comparison
flecainide is classified in the Class IC Antiarrhythmic drug class, while nifedipine sits within the Calcium Channel Blocker class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, flecainide has 1,382 submissions while nifedipine has 11,213. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. These two drugs have a known minor interaction flagged in FDA labeling, attributed to there is very little information about how these two drugs work together, so the risks are unknown.. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between flecainide and nifedipine - always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.