Felodipine Tablets (Felotens, Vascalpha)
Comprehensive guide to felodipine tablets for hypertension management, covering uses, dosage, side effects, and precautions.
Felodipine is a medication classified as a calcium channel blocker, primarily used to treat high blood pressure (hypertension). It works by relaxing and widening blood vessels, making it easier for the heart to pump blood, thereby reducing blood pressure and the workload on the heart.
About felodipine tablets
Felodipine tablets, available under brand names such as Felotens and Vascalpha, are prescribed to manage hypertension in adults. Unlike some other calcium channel blockers, felodipine selectively targets arterioles, providing effective blood pressure control without significantly affecting heart contractility. It is typically taken once daily in extended-release form to maintain steady drug levels.
These tablets should be swallowed whole with water and not chewed or crushed to preserve the extended-release mechanism. They are not recommended for children, and use in pregnancy or breastfeeding requires careful medical evaluation due to limited data on fetal safety.
Key facts about felodipine tablets
- Felodipine is a type of calcium antagonist (blocker).
- The usual starting dose is 5 mg daily, adjustable up to 10 mg.
- Common brands include Felotens XL and Vascalpha.
- It may cause ankle swelling (peripheral edema) in up to 30% of users, especially at higher doses or in the elderly.
- Headaches are common initially but often resolve within the first week.
- Alcohol can enhance blood pressure-lowering effects, so limit intake.
- Grapefruit juice interacts with felodipine, increasing its levels in the blood and risk of side effects.
Before taking felodipine tablets
Who can and cannot take felodipine tablets
Most adults with hypertension can take felodipine, but it is not suitable for individuals with:
- Severe aortic stenosis (narrowing of the heart valve).
- Acute heart failure or unstable angina.
- Cardiogenic shock.
- Known hypersensitivity to felodipine or dihydropyridines.
Caution is advised in patients with mild heart failure, hepatic impairment, or those taking beta-blockers, as felodipine may exacerbate heart conditions in some cases. Elderly patients may require lower doses due to increased sensitivity.
Other medicines, food and drink, pregnancy, breastfeeding, and fertility while taking felodipine tablets
Interactions: Felodipine can interact with several medications, including:
| Drug Class | Examples | Effect |
|---|---|---|
| CYP3A4 inhibitors | Ketoconazole, itraconazole, ritonavir | Increase felodipine levels, risk of hypotension |
| CYP3A4 inducers | Rifampicin, phenytoin | Decrease felodipine effectiveness |
| Beta-blockers | Metoprolol, atenolol | May enhance effects; monitor heart rate |
| Tacrolimus, cyclosporine | – | Increased levels of immunosuppressants |
Food and drink: Avoid grapefruit and grapefruit juice, as they inhibit the enzyme that metabolizes felodipine, leading to higher drug concentrations and increased side effects. Moderate alcohol consumption is advised.
Pregnancy: Felodipine is not routinely recommended during pregnancy. Use only if benefits outweigh risks, under specialist supervision.
Breastfeeding: Small amounts pass into breast milk; monitor infant for side effects or consider alternatives.
Fertility: No evidence of impaired fertility in humans at therapeutic doses.
How and when to take felodipine tablets
Dosage
The typical dosage regimen is:
| Patient Group | Starting Dose | Maintenance Dose | Maximum Dose |
|---|---|---|---|
| Adults | 5 mg once daily | 5-10 mg once daily | 10 mg daily |
| Elderly (>65 years) | 2.5-5 mg once daily | Adjust based on response | 10 mg daily |
| Hepatic impairment | 2.5 mg once daily | Titrate slowly | 10 mg daily |
Dose adjustments should be made at intervals of at least 2 weeks. Blood pressure should be monitored regularly.
How to take it
- Take with or without food, but consistently.
- Swallow whole; do not divide, crush, or chew.
- If a dose is missed, take as soon as remembered unless near next dose; do not double up.
Side effects of felodipine tablets
Felodipine is generally well-tolerated, but side effects are primarily due to its vasodilatory action. The most frequent is peripheral edema, resulting from increased capillary pressure and fluid extravasation.
Common side effects
These affect more than 1 in 100 people:
- Peripheral edema (swelling of ankles/feet, up to 30% incidence, dose-related)
- Flushing (warmth/redness of skin)
- Headache (often resolves after first week)
- Palpitations or fast heart rate (reflex tachycardia)
- Dizziness or lightheadedness
- Fatigue or weakness
Serious side effects
Seek immediate medical attention for:
- Chest pain, shortness of breath, or worsening angina
- Severe hypotension (fainting, dizziness upon standing)
- Signs of allergic reaction: rash, itching, swelling of face/lips/tongue, difficulty breathing
- Irregular heartbeat or bradycardia in overdose
- Yellowing of skin/eyes (rare liver issues)
Less common side effects
- Gum hyperplasia (enlargement of gums)
- Nausea, constipation, or stomach upset
- Rash or itching
- Joint/muscle pain
- Increased urination
Side effects like headaches and flushing often improve as the body adjusts. Peripheral edema can be mitigated by combining with ACE inhibitors. Report persistent issues to your doctor.
How to cope with side effects of felodipine tablets
- Edema: Elevate legs, reduce salt intake, wear compression stockings.
- Headache: Rest, hydrate, use paracetamol if approved; consult if lasts >1 week.
- Dizziness: Rise slowly from sitting/lying, avoid driving until adjusted.
- Flushing: Usually transient; stays cool, wear light clothing.
- Palpitations: Monitor pulse; contact doctor if persistent.
Pregnancy and breastfeeding while taking felodipine tablets
Limited data exist, but animal studies suggest potential risks. Use only if essential, with monitoring. Alternatives like methyldopa may be preferred in pregnancy. During breastfeeding, weigh risks; small amounts enter milk.
Taking felodipine tablets with other medicines and herbal supplements
Inform your doctor of all medications. Key interactions include CYP3A4 modulators, which alter felodipine metabolism. St. John’s wort may reduce efficacy. No major issues with common painkillers, but caution with NSAIDs as they may counteract blood pressure control.
Common questions about felodipine tablets
Frequently Asked Questions (FAQs)
Can I drink alcohol while taking felodipine?
Limit alcohol, as it may enhance blood pressure lowering and increase dizziness.
Does felodipine cause weight gain?
Not directly, but edema can mimic weight gain; report rapid changes.
How long does it take for felodipine to work?
Blood pressure lowers within 2-5 hours; full effect in 1-2 weeks.
Can felodipine be crushed?
No, crush extended-release tablets destroy the mechanism, causing rapid release and side effects.
What if I forget a dose?
Take as soon as possible unless near next dose; never double.
Is felodipine safe for long-term use?
Yes, for chronic hypertension management, with regular monitoring.
Stopping felodipine tablets – NHS advice
Do not stop abruptly, as blood pressure may rebound. Taper under medical supervision, especially if on high doses or with other antihypertensives.
References
- Felodipine – StatPearls — NCBI Bookshelf, NIH. 2023-10-01. https://www.ncbi.nlm.nih.gov/books/NBK542163/
- Felodipine (oral route) — Mayo Clinic. 2024-05-01. https://www.mayoclinic.org/drugs-supplements/felodipine-oral-route/description/drg-20071701
- Felodipine: Side Effects, Uses, Dosage — RxList. 2024-01-15. https://www.rxlist.com/felodipine/generic-drug.htm
- Felodipine: MedlinePlus Drug Information — MedlinePlus, NIH. 2024-03-20. https://medlineplus.gov/druginfo/meds/a692016.html
- Felodipine (Plendil) – Uses, Side Effects — WebMD. 2024-02-10. https://www.webmd.com/drugs/2/drug-7244/felodipine-oral/details
- Side effects of felodipine — NHS. 2023-11-15. https://www.nhs.uk/medicines/felodipine/side-effects-of-felodipine/
- Felodipine Extended-Release Oral Tablets — Cleveland Clinic. 2024-04-05. https://my.clevelandclinic.org/health/drugs/18721-felodipine-extended-release-tablets
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