A calcium-channel blocker for high blood pressure
Nisoldipine
A calcium-channel blocker used to lower high blood pressure by relaxing and widening the blood vessels.
What is Nisoldipine?
Nisoldipine is a calcium-channel blocker of the dihydropyridine type, the same family as amlodipine, used to treat high blood pressure. It works by relaxing and widening the blood vessels so blood flows more easily and the pressure falls. The most common side effects come from this widening of blood vessels: swollen ankles, flushing, headache and sometimes a faster heartbeat. It should be taken consistently with respect to food, and grapefruit and grapefruit juice should be avoided because they can raise the level of the medicine in the body.
Education and reference only. This is a plain-language guide to Nisoldipine — it deliberately contains no doses. Doses depend on the person, the brand and the reason for treatment, and belong with your prescriber. Always check the BNF, the product labelling (SmPC) and follow medical advice.
What it is
Nisoldipine is a medicine used to treat high blood pressure. It belongs to a group called calcium-channel blockers, specifically the dihydropyridine type, which act mainly on blood vessels — the same broad family as amlodipine and nifedipine. By relaxing the muscle in the walls of the arteries, it widens them and lowers blood pressure. It is taken by mouth, usually once a day. Controlling blood pressure over the long term helps reduce the risk of problems such as stroke and heart disease, which is why it is taken regularly even when you feel well.
How it works
The muscle in the walls of blood vessels needs calcium to tighten. Nisoldipine blocks the channels that let calcium into these muscle cells, so the vessels relax and widen. Wider arteries offer less resistance to blood flow, so the pressure inside them falls. Because it acts mainly on blood vessels rather than the heart's pumping, its main effects and side effects relate to this widening. It is usually taken once a day to give steady control of blood pressure throughout the day and night.
Company & origin
Originated / developed by: Generic.
A calcium-channel blocker of the same family as amlodipine, used to lower high blood pressure by relaxing and widening the blood vessels.
What it treats
Conditions Nisoldipine is used for
Practical use
How to take Nisoldipine
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- Take it by mouth once a day, at about the same time each day, as prescribed.
- Be consistent about food: take it the same way each day, as food can affect how much is absorbed.
- Avoid grapefruit and grapefruit juice, which can raise the level of the medicine and increase side effects.
- Keep taking it even when you feel well, as high blood pressure usually causes no symptoms.
- Do not stop suddenly without advice; speak to your prescriber if side effects trouble you.
Weighing it up
Advantages & disadvantages of Nisoldipine
Advantages
- Effectively lowers high blood pressure by relaxing and widening the blood vessels.
- Usually taken just once a day, which is convenient.
- Part of the well-established calcium-channel blocker family used widely for blood pressure.
Disadvantages
- Commonly causes swollen ankles, flushing, headache or a faster heartbeat from widening blood vessels.
- Interacts with grapefruit, which must be avoided.
- Needs to be taken consistently with respect to food for steady absorption.
Practical use
Good to know
Most of nisoldipine's common side effects come simply from the way it widens blood vessels: swollen ankles, flushing, headache and sometimes a feeling of a faster or more noticeable heartbeat. These are often most noticeable when first starting and may ease with time. Two practical points stand out. First, it should be taken consistently in relation to food — the same way each day — because food can change how much of it is absorbed. Second, grapefruit and grapefruit juice should be avoided, as they can raise the amount of the medicine in the body and increase side effects. Because high blood pressure usually causes no symptoms, it is important to keep taking it regularly even when you feel completely well, and not to stop suddenly without advice.
Who should not take it / use with caution
- People who have had a serious allergic reaction to nisoldipine or similar calcium-channel blockers should not take it.
- It is used with caution in people with certain heart conditions, such as severe heart valve narrowing or unstable heart problems.
- It is used with care in people with significant liver problems, who may need closer review.
Monitoring
- Checking blood pressure to make sure it is well controlled.
- Watching for ankle swelling, flushing or other side effects.
- Reviewing other medicines for possible interactions.
Side effects
- Swollen ankles or feet from fluid pooling as blood vessels widen.
- Flushing, a feeling of warmth, or headache.
- A faster or more noticeable heartbeat (palpitations).
- Dizziness, especially when standing up quickly, if blood pressure drops.
Key interactions
- Grapefruit and grapefruit juice can raise the level of the medicine and should be avoided.
- Other blood-pressure-lowering medicines can add to its effect, sometimes lowering pressure too much.
- Some medicines that affect the liver's enzymes can raise or lower its level, so tell your prescriber what you take.
Available as: Tablets taken by mouth.
Answers
Nisoldipine: frequently asked questions
What is nisoldipine used for?
It is a calcium-channel blocker used to treat high blood pressure, working by relaxing and widening the blood vessels so the pressure falls.
Why are my ankles swollen?
Swollen ankles are a common effect of calcium-channel blockers like nisoldipine, caused by fluid pooling as the blood vessels widen; tell your prescriber if it troubles you.
Why must I avoid grapefruit?
Grapefruit and grapefruit juice can raise the amount of nisoldipine in your body, which can increase side effects, so they should be avoided.
Does it matter when I take it with food?
Be consistent: take it the same way in relation to food each day, because food can change how much of the medicine is absorbed.
Can I stop it when my blood pressure is normal?
No. High blood pressure usually has no symptoms, and the medicine is keeping it controlled, so keep taking it and only change it on your prescriber's advice.
The wider class
About Dihydropyridine calcium-channel blocker
Nisoldipine belongs to the dihydropyridine calcium-channel blocker class. For how the class as a whole works, its shared safety principles and monitoring, see the full guide.
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Authoritative sources
- BNF
- NICE CKS
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