What Is Verapamil? Uses, Dosage, and What You Need to Know in 2026

Verapamil is one of the oldest and most widely prescribed heart medications in the world. First synthesized in Germany in 1962 and approved by the FDA for use in the United States, it has been used by millions of patients for high blood pressure, irregular heartbeats, chest pain, and even cluster headaches. If you or a family member has been prescribed verapamil — or if you're simply trying to understand what it is — this guide covers everything you need to know in 2026.

What Is Verapamil?

Verapamil is a non-dihydropyridine calcium channel blocker — a type of medication that works by blocking the entry of calcium ions into the muscle cells of the heart and blood vessel walls. This makes the heart beat more slowly and with less force, and it relaxes blood vessels, reducing blood pressure.

Verapamil is also classified as a Group IV antiarrhythmic because it slows electrical conduction through the atrioventricular (AV) node — the "relay station" between the heart's upper and lower chambers. This property makes it particularly useful for controlling rapid heart rates in arrhythmia conditions.

Brand Names for Verapamil

Verapamil is the generic name. Brand names include:

Calan SR — extended-release tablet (Pfizer); taken with food

Verelan — extended-release capsule; taken in the morning

Verelan PM — controlled-onset extended-release capsule; taken at bedtime

Isoptin SR — extended-release tablet (Canadian market)

Covera-HS — controlled-onset extended-release tablet, taken at bedtime

Tarka — combination product with verapamil + trandolapril (ACE inhibitor) for hypertension

Note: Both Calan (immediate-release) and Calan SR brand-name products have been discontinued — but generic verapamil in those formulations remains available.

What Is Verapamil Used For?

Verapamil has FDA-approved uses and several important off-label uses:

Hypertension (high blood pressure): FDA-approved as add-on therapy. Used when other medications are not sufficient or not tolerated.

Angina: FDA-approved for chronic stable angina, vasospastic (Prinzmetal) angina, and unstable angina. Dilates coronary arteries and reduces the heart's oxygen demand.

Supraventricular tachycardia (SVT) and PSVT: FDA-approved for prevention and acute conversion (IV form) of paroxysmal supraventricular tachycardia.

Atrial fibrillation/flutter: FDA-approved for ventricular rate control in chronic AF.

Cluster headache prevention (off-label): Despite not being FDA-approved for this use, verapamil is considered the first-line preventive treatment for cluster headaches per European neurological guidelines. Doses of 240–960 mg/day are typically used.

Migraine prevention (off-label): Less commonly used today, as more effective migraine-specific agents are available.

Available Dosage Forms and Strengths

Verapamil comes in multiple forms — the right one depends on your condition, dosing needs, and your doctor's preference:

Immediate-release (IR) tablets: 40 mg, 80 mg, 120 mg — taken 3–4 times per day

Extended-release (ER) tablets: 120 mg, 180 mg, 240 mg — taken once or twice daily with food

Extended-release (ER) capsules: 100–360 mg — Verelan taken in morning; Verelan PM taken at bedtime

IV injection: 2.5 mg/mL — for hospital use only, to rapidly convert SVT or control ventricular rate

Typical Dosage Ranges

Dosing varies by indication and formulation. General adult dosage ranges include:

Hypertension (ER): 180–480 mg once daily (starting at 120–180 mg/day)

Angina (IR): 80–160 mg three times daily; max 480 mg/day

SVT — acute (IV): 2.5–10 mg IV over 2+ minutes

Cluster headache (off-label): 240–960 mg/day (requires ECG monitoring)

Always take the dose and formulation prescribed by your doctor. Do not adjust your dose or switch formulations without medical guidance.

Is Verapamil a Controlled Substance?

No. Verapamil is not a DEA-controlled substance. It requires a prescription but has no abuse potential or scheduling restriction. Prescriptions can be phoned in, faxed, or electronically submitted, and refills are generally available without an in-person visit.

Finding Verapamil When Your Pharmacy Is Out

Some verapamil formulations — particularly extended-release capsules — can be hard to find at certain pharmacies. medfinder is a paid service that helps patients locate pharmacies near them that can fill their specific verapamil prescription. For a deeper understanding of what to watch for on this medication, read Verapamil Side Effects: What to Expect and When to Call Your Doctor.