Verapamil
Isoptin (verapamil) is a calcium channel blocker that helps relax blood vessels and reduce the heart's workload. It is prescribed for the treatment of hypertension (high blood pressure), angina (chest pain), and certain heart rhythm disorders such as atrial fibrillation. This medication is typically used when lifestyle modifications alone are insufficient to control blood pressure or cardiac symptoms.
Isoptin is a calcium channel blocker used to treat high blood pressure, angina, and heart rhythm disorders by relaxing blood vessels and slowing the heart rate.
Key facts at a glance
- RxNorm
- 203489
- Generic
- Isoptin
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Isoptin is used to treat hypertension (high blood pressure), angina (chest pain), and certain cardiac arrhythmias including atrial fibrillation and atrial flutter. It may also be used in some cases for migraine prevention.
Isoptin belongs to the non-dihydropyridine class of calcium channel blockers. It works by blocking calcium from entering the smooth muscle cells of blood vessels and the heart. This causes blood vessels to relax and widen (vasodilation), reduces the heart's contractility, and slows the conduction through the atrioventricular node, helping to control heart rhythm.
Isoptin should be taken exactly as prescribed. Avoid grapefruit juice as it may increase drug levels. Do not stop taking this medication abruptly without medical supervision. Common side effects may include constipation, dizziness, headache, and low blood pressure. Inform your doctor about all medications being taken, as drug interactions can occur. This medication may not be suitable for patients with certain heart conditions such as severe heart failure or bradycardia.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed July 26, 2026. · Read our editorial policy