Swollen ankles are the side effect of amlodipine that pharmacists are asked about most. The swelling is common, it is usually not dangerous, and it is not a sign that your body is holding on to too much fluid. It is thought to happen because the medicine widens small blood vessels in a way that lets fluid seep into the tissues of the lower legs.

The good news is that there are real options if it bothers you. Your prescriber can lower the dose, switch you to a similar medicine that causes less swelling, or add a second type of blood pressure medicine that counters it. What usually does not help is a "water pill". And please do not stop amlodipine on your own.

What amlodipine is for

The NHS describes amlodipine as a medicine used to treat high blood pressure and angina. It belongs to a group called calcium channel blockers. It works by relaxing and widening your blood vessels, which makes it easier for blood to pump around your body. Lowering high blood pressure reduces the risk of serious problems like heart attacks and stroke.

The World Health Organization's 2021 hypertension guideline recommends three classes of medicine as first-line treatment for adults: thiazide and thiazide-like diuretics, ACE inhibitors or ARBs, and long-acting dihydropyridine calcium channel blockers. Amlodipine belongs to that last group.

If you want to understand the numbers your treatment is aiming for, see our guide to blood pressure readings explained.

Common amlodipine side effects and how often they happen

The NHS lists these as common side effects of amlodipine:

swelling in the ankles, feet and legs (edema)
headaches, dizziness and sleepiness
palpitations (a fast heartbeat, or a heartbeat you notice more)
flushing (a red, warm face or neck)
nausea and tummy pain
constipation or diarrhea
feeling weak and tired

The NHS notes that some side effects should ease after a week or so as your body gets used to the medicine. The UK patient leaflet for amlodipine tablets adds that headache, dizziness and sleepiness happen especially at the beginning of treatment.

The US prescribing information for Norvasc (the original brand of amlodipine) gives trial figures for the side effects that rose with the dose. These are the percentages it reports:

Edema (swelling): 1.8% on 2.5 mg, 3.0% on 5 mg, 10.8% on 10 mg, and 0.6% on placebo
Dizziness: 1.1% on 2.5 mg, 3.4% on 5 mg, 3.4% on 10 mg, and 1.5% on placebo
Flushing: 0.7% on 2.5 mg, 1.4% on 5 mg, 2.6% on 10 mg, and 0.0% on placebo
Palpitations: 0.7% on 2.5 mg, 1.4% on 5 mg, 4.5% on 10 mg, and 0.6% on placebo

The same label reports that swelling was more common in women. It occurred in 5.6% of men and 14.6% of women on amlodipine, compared with 1.4% and 5.1% on placebo.

Only about 1.5% of people in the label's trials stopped the medicine because of side effects, against about 1% on placebo. But a large meta-analysis of 106 trials with 99,469 people found that swelling with calcium channel blockers became more common the longer people took them, reaching about 24% at six months.

Why amlodipine makes your ankles swell

Amlodipine widens the small arteries that carry blood into the tiny vessels (capillaries) of your legs. A 2022 network meta-analysis in the Journal of Clinical Hypertension describes the main mechanism as an imbalance between the tone of the vessels before and after the capillaries. That raises the pressure inside the capillaries, and fluid is pushed out into the surrounding tissue. It collects lowest down, around the ankles and feet, and standing upright for long periods makes it more likely.

This has a practical consequence. The NHS Specialist Pharmacy Service (SPS), which advises UK pharmacists and prescribers, says that thiazide and loop diuretics have little effect on calcium channel blocker swelling and are not recommended for it, because they do not address the pooling caused by vessel widening.

SPS also lists who is more likely to be affected:

women
older people
people with heart failure
people who stand upright for long periods
people in warm environments

When it starts, and does amlodipine swelling go away?

According to SPS, swelling from calcium channel blockers usually develops within the first few weeks to months after starting or after a dose increase. It rarely appears in the first few days.

SPS states that this swelling is unlikely to be short-lived or to settle on its own, and that it needs active management. It may improve after lying down for several hours.

So waiting it out is not usually the answer. If the swelling bothers you, raise it with your prescriber. The 2022 review notes that this side effect can lead to dose reduction or stopping the medicine, and the 2011 meta-analysis found that over the long term more than 5% of people stopped calcium channel blockers because of swelling. A planned change is far safer than quietly stopping.

What you can do yourself

The NHS page on swollen ankles, feet and legs suggests these steps for swelling in general:

Raise your legs on a chair or pillows when you can.
Do gentle exercise, such as walking, to help blood flow.
Wear wide, comfortable shoes with a low heel and a soft sole.
Wash, dry and moisturize your feet to help avoid infection.
Do not stand or sit in one position for long periods.
Do not wear clothes, socks or shoes that are too tight.

The same NHS page notes that eating too much salty food is one of the common causes of swelling. SPS adds that raising your legs when lying down, or graduated compression stockings, may be an option for some people with mild swelling. Ask your pharmacist, nurse or doctor whether compression stockings are suitable for you before buying them.

Options your prescriber may consider

Never change your dose, cut tablets or swap medicines yourself. But it helps to know what your prescriber may discuss with you. SPS describes these approaches:

A lower dose. Swelling is related to the dose, and reducing the dose may reduce how severe it is. The US label figures above show the difference between 5 mg and 10 mg. Your prescriber will weigh this against your blood pressure control.
Adding an ACE inhibitor or ARB. The 2022 review suggests these medicines work by reducing resistance on the outflow side of the capillaries, which would help bring the pressure inside them back towards normal. A 2011 meta-analysis of 25 trials with 17,206 people found that swelling was 38% less common when a calcium channel blocker was combined with one of these medicines, and that stopping treatment because of swelling was 62% less common. The trials were short, lasting about nine weeks on average, and in an indirect comparison ACE inhibitors worked better than ARBs. SPS advises that adding a medicine to counter the swelling should be done cautiously. The 2022 network meta-analysis found that amlodipine combined with an ACE inhibitor ranked best for reducing swelling.
Switching to a different calcium channel blocker. SPS notes that lercanidipine and lacidipine are associated with less swelling, and that verapamil and diltiazem appear less likely to cause it. These medicines are not identical and are not suitable for everyone.
Switching to another class of medicine. If swelling continues despite these steps, SPS says the calcium channel blocker can be stopped and a different blood pressure medicine considered.

Any of these changes should be planned by your prescriber, who knows your other conditions and medicines.

When swelling is NOT the medicine

Swelling can also have other causes. The NHS lists heart, kidney and liver problems, blood clots, infection, injury, varicose veins and other medicines among them.

When to get urgent help

Get urgent medical advice the same day if:

you have swelling in one ankle, foot or leg and you do not know what is causing it
the swelling is severe, painful or starts very suddenly
the swollen area is red or hot, or you have a high temperature (fever)
the swelling also affects your face or tummy
you have diabetes and your feet, ankles or legs are swollen
you have throbbing pain in one leg, usually in the calf or thigh, with swelling, or red, blue or darkened skin around the painful area (this can be harder to see on brown or black skin). These can be signs of a blood clot (deep vein thrombosis)

Call your local emergency number or go to an emergency department straight away if:

you feel short of breath or are struggling to breathe, or you have a racing or irregular heartbeat with these symptoms
your chest feels tight, heavy or painful
you are coughing up blood, or you feel lightheaded, faint, confused or clammy
you have swelling of the lips, tongue or throat, a raised itchy rash, or difficulty breathing (possible allergic reaction)

Do not drive yourself.

See your doctor (not as an emergency) if swelling in both legs has not improved after a few days of self-care, is getting worse, or if you already have a heart, kidney or leg vein condition, as the NHS advises.

Other side effects worth knowing

Headache and flushing. Both are common. The NHS says some side effects ease after a week or so. Mention them if they do not.
Dizziness and sleepiness. The NHS advises not to drive, ride a bike or use machinery until these symptoms stop. The NHS also advises limiting alcohol, because it can increase the risk of low blood pressure.
Palpitations. A heartbeat you notice more is listed as common. But the UK patient leaflet lists an abnormal or irregular heartbeat, or a faster heart rhythm, among the effects that need urgent medical attention.
Gum overgrowth. The US label lists gingival hyperplasia (overgrowth of the gums) among events reported in 0.1% to 1% of trial participants, with uncertain cause. The UK patient leaflet lists swelling of the gums as very rare. Tell your dentist which medicines you take.
Worsening chest pain. The US label warns that worsening angina or a heart attack can develop after starting amlodipine or increasing the dose, particularly in people with severe narrowing of the heart arteries. New or worse chest pain needs urgent help.
Rare serious reactions. The NHS lists allergic reaction, acute pancreatitis (sudden, severe tummy pain that does not go away), Stevens-Johnson syndrome (a serious skin reaction with blistering and peeling) and, very rarely, heart attack.

Interactions to know about

The NHS lists these as medicines that may not mix well with amlodipine:

simvastatin, a cholesterol medicine. The US label says to limit the simvastatin dose in people on amlodipine to 20 mg daily
some antibiotics, such as rifampicin
other blood pressure medicines
some antifungal medicines, such as fluconazole
some HIV medicines
immunosuppressants such as ciclosporin or tacrolimus. The US label says amlodipine may increase blood levels of these
herbal medicines such as St John's wort

The NHS also says not to eat grapefruit or drink grapefruit juice while taking amlodipine, because it can increase the chance of side effects. Tell your pharmacist about every medicine and supplement you take. If you need a painkiller, read our guide on taking ibuprofen with blood pressure medicine first.

Can I stop amlodipine?

Not on your own. The NHS says do not stop taking amlodipine unless a doctor tells you to, because stopping suddenly can be dangerous. The UK patient leaflet adds that your condition may return if you stop before you are advised to.

If side effects are the reason you want to stop, see your prescriber instead. There are alternatives, as described above. Our guide to blood pressure readings explains how to check whether a new plan is working.

If you miss a dose

The NHS advises: if you miss a dose of amlodipine, skip the missed dose and take your next dose as usual. Do not take two doses to make up for a missed one. The NHS also warns that taking an extra dose can be dangerous. If you have taken more than prescribed, get medical advice straight away.

The NHS says amlodipine is usually taken once a day at the same time, before or after food.

Questions to ask your doctor or pharmacist

Is my ankle swelling likely to be from amlodipine, or should we check for another cause?
Would a lower dose still control my blood pressure?
Would adding an ACE inhibitor or ARB, or switching to another calcium channel blocker, suit me?
Do any of my other medicines, including statins, antibiotics, antifungals or herbal remedies, interact with amlodipine?
What blood pressure should I aim for, and how often should I check it?
Which symptoms should make me seek help the same day?

Frequently asked questions

Does amlodipine swelling go away?

It does not usually go away by itself. SPS says it needs active management. A lower dose, a switch or an added medicine, chosen by your prescriber, can reduce it.

How long after starting amlodipine does swelling start?

Usually within the first few weeks to months of starting or increasing the dose, according to SPS. It rarely appears in the first few days.

Will a water pill (diuretic) fix amlodipine swelling?

Usually not. The swelling comes from a pressure imbalance in the small blood vessels, not from too much fluid in the body. SPS says thiazide and loop diuretics have little effect on it and are not recommended for this purpose.

Is amlodipine swelling dangerous?

It is a common, recognized side effect, but it can be uncomfortable and leads some people to stop treatment. The bigger concern is missing a different cause. Swelling in one leg, calf pain, breathlessness or chest pain is not typical of amlodipine and needs prompt medical attention.

Does amlodipine cause headaches and flushing?

Yes. The NHS lists both as common. In the US label's trials, flushing was more common at higher doses. Speak to your pharmacist or doctor if they do not ease.

Can I eat grapefruit on amlodipine?

The NHS advises not to eat grapefruit or drink grapefruit juice while taking amlodipine, because it can increase the chance of side effects.

This article is general information and does not replace advice from your own doctor or pharmacist.

Sources

NHS. Amlodipine: side effects (page last reviewed 9 June 2026)
NHS. About amlodipine (page last reviewed 9 June 2026)
NHS. How and when to take amlodipine (page last reviewed 9 June 2026)
NHS. Taking amlodipine with other medicines and herbal supplements (page last reviewed 9 June 2026)
NHS. Common questions about amlodipine (page last reviewed 9 June 2026)
NHS. Swollen ankles, feet and legs (oedema) (page last reviewed 26 February 2026)
NHS. Deep vein thrombosis (DVT) (page last reviewed 30 April 2026)
Pfizer / U.S. Food and Drug Administration. NORVASC (amlodipine besylate) prescribing information, revised 1/2019
Mylan. Amlodipine 5 mg and 10 mg tablets: patient information leaflet, revised 06/2025 (electronic medicines compendium)
NHS Specialist Pharmacy Service. Managing peripheral oedema caused by calcium channel blockers (updated 26 May 2026)
World Health Organization. Guideline for the pharmacological treatment of hypertension in adults: executive summary (2021)
Makani H, et al. Peripheral edema associated with calcium channel blockers: incidence and withdrawal rate, a meta-analysis of randomized trials. J Hypertens. 2011;29(7):1270-1280.
Makani H, et al. Effect of renin-angiotensin system blockade on calcium channel blocker-associated peripheral edema. Am J Med. 2011;124(2):128-135.
Liang L, et al. Comparative peripheral edema for dihydropyridines calcium channel blockers treatment: a systematic review and network meta-analysis. J Clin Hypertens. 2022;24(5):536-554.