Verapamil: uses, side effects & brands

Written & medically reviewed by Dr. Sanjay Anbu, MBBS · Last reviewed 5 November 2026

Verapamil is a calcium-channel blocker used for rhythm control and angina. It belongs to the Calcium-channel blocker (blood pressure) group. These relax and widen blood vessels to lower blood pressure and ease angina.

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Drug type — dosing is set by your doctor

Measure	Range
Drug class	Calcium-channel blocker (blood pressure)
Type	Prescription
Dose	Individual — ask your doctor or pharmacist

What it is used for

Angina (chest pain)
High blood pressure
Some fast heart rhythms (such as SVT or atrial fibrillation)
Preventing cluster headaches (specialist use)

Common brand names

India: Calaptin, Veroz
Worldwide: Calan, Isoptin

Common side effects

Constipation (common)
Headache or flushing
Dizziness or slow pulse
Ankle swelling

Before taking it — precautions

Tell your doctor about heart failure or heart-rhythm problems
Combining with a beta-blocker needs close supervision
Many medicines interact (some statins, digoxin), and avoid grapefruit

When to see a doctor urgently

Very slow pulse, fainting or severe dizziness (urgent)
Breathlessness or new swelling of the legs
Yellowing of the eyes or skin

Not a prescription — no dose shown. The right dose of verapamil depends on age, weight, kidney/liver function and the condition, so MedDroid does not show a dose here. Always get your dose from a doctor or pharmacist and the leaflet inside the pack. General educational information only.

Frequently asked questions

Why does verapamil cause constipation?

It relaxes the muscles of the gut as well as the heart. Drinking water and eating fibre helps; tell your doctor if it is severe.

Can I take verapamil with a beta-blocker?

Only if your doctor specifically decides so — the combination can slow the heart dangerously.

Should I avoid grapefruit with verapamil?

Yes — grapefruit can raise verapamil levels and increase side effects.

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Sources & further reading

Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.