Lyng Pharmacy
Medicines A–Z · Calcium channel blocker

Amlodipine

Also sold as Istin · Written by the Lyng Pharmacy team, based on NHS and BNF guidance · Updated August 2026
Also sold asIstin
Type of medicineCalcium channel blocker
Available asTablets, oral solution
How you get itPrescription only

Amlodipine relaxes and widens blood vessels, which lowers blood pressure and improves blood flow to the heart. Its most characteristic side effect — swollen ankles — catches a lot of people out, and there are usually good options for it short of stopping.

What it is used for

High blood pressure, and angina. Lowering blood pressure reduces the long-term risk of stroke, heart attack and kidney disease. Like a statin, you will not feel it working — the benefit is in what does not happen.

How to take it

Once daily, at the same time each day, with or without food. Any time of day is fine as long as it is consistent.

It usually takes a few days to reach full effect, and your blood pressure may need rechecking a few weeks after starting or changing the dose.

Do not stop taking it because your blood pressure readings have become normal — they are normal because of the tablet. Stopping suddenly can send blood pressure back up.

Side effects

The common ones are swollen ankles, flushing, headache, dizziness and tiredness. Headache and flushing often settle within the first week or two.

Swollen ankles happen because of how the medicine widens blood vessels; it is not fluid overload, and water tablets are not usually the answer. Raising your legs when sitting helps, and if it is troublesome your GP can lower the dose or switch you to a different type of blood pressure medicine. It is worth mentioning rather than tolerating.

Get medical advice for chest pain that is new or worse, a very fast or irregular heartbeat, fainting, or swelling of the face, lips or throat.

Other things worth knowing

Getting up slowly from sitting or lying reduces dizziness. Be careful with alcohol, which can add to the blood-pressure-lowering effect.

Grapefruit juice increases amlodipine levels and is best avoided in quantity.

Tell your prescriber if you take simvastatin — the dose may need capping — or medicines for a fungal infection, certain antibiotics, or medicines for HIV.

Amlodipine is not usually recommended in pregnancy; if you are pregnant or planning to be, speak to your GP about alternatives rather than stopping on your own.

Always read the label. This page is general information, not advice for your situation. Doses, warnings and interactions differ between products and between people. Check the leaflet inside your medicine, and ask our pharmacist if anything is unclear — that conversation is free and takes two minutes.

Questions about Amlodipine?

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Frequently asked questions

Why has amlodipine made my ankles swell?
It is a direct effect of how the medicine widens blood vessels, and it is common. Raising your legs helps, and your GP can reduce the dose or switch you — it is worth mentioning rather than putting up with.
Can I stop amlodipine if my blood pressure is normal?
No — your readings are normal because of the tablet. Stopping without advice usually lets blood pressure rise again.
When should I take amlodipine?
Once a day at the same time each day, with or without food. Morning or evening is fine, whichever helps you remember.
Can I drink alcohol on amlodipine?
In moderation, but alcohol adds to the blood-pressure-lowering effect and can make you dizzy, especially when you first start.

Related pages

Ramipril →Atorvastatin →Free blood pressure checks →24-hour blood pressure monitoring →All medicines A–Z →

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