1. About valsartan

Valsartan is a medicine widely used to treat high blood pressure and heart failure. It's also sometimes prescribed after a heart attack.

Valsartan is only available on prescription. It comes as tablets, capsules and as a liquid that you swallow.

2. Key facts

  • Valsartan lowers your blood pressure and makes it easier for your heart to pump blood around your body.
  • It's often used as a second-choice treatment if you had to stop taking a similar medicine because it gave you a dry, irritating cough.
  • If you get severe vomiting or diarrhoea from a stomach bug or illness, tell your doctor. You may need to stop taking valsartan for a while until you feel better.
  • The main side effect of valsartan is dizziness - but it's usually mild and short-lived.
  • Valsartan is not normally recommended in pregnancy. Talk to your doctor if you're trying to get pregnant or you're already pregnant.
  • Valsartan is also called by the brand name Diovan.

3. Who can and can't take valsartan

Valsartan can be taken by adults aged 18 and over.

Children over the age of 6 can take valsartan, but only to treat high blood pressure.

Your doctor may prescribe valsartan if you've tried taking blood pressure-lowering medicines called ACE inhibitors - such as ramipril and lisinopril - but had to stop taking them because of side effects such as a dry, irritating cough.

Valsartan isn't suitable for some people.

To make sure valsartan is safe for you, tell your doctor if you:

  • have had an allergic reaction to valsartan or other medicines in the past
  • have severe liver disease
  • have diabetes
  • have heart or kidney problems
  • recently had a kidney transplant
  • have diarrhoea or vomiting (or if you've recently had it)
  • have been on a low salt diet
  • have low blood pressure
  • are trying to get pregnant, are already pregnant or if you are breastfeeding

4. How and when to take it

It's usual to take valsartan once or twice a day.

If you take valsartan once a day, your doctor may suggest that you take your first dose before bedtime, because it can make you dizzy. After the very first dose, you can take valsartan at any time of day. Try to take it at the same time every day.

You can take valsartan tablets with or without food. Swallow the tablets whole with a drink of water.

How much will I take?

The dose of valsartan you take depends on why you need the medicine. Take it as instructed by your doctor.

The usual dose for adults is:

  • 80mg to 320mg once a day for high blood pressure
  • 40mg to 160mg twice a day for heart failure
  • 20mg to 160mg twice a day after a recent heart attack

The dose may be lower if you've recently lost body fluids (for example because of diarrhoea or vomiting).

The dose for children depends on their weight. The usual dose for children is:

  • 40mg to 80mg once a day (for children weighing 18kg to 35kg)
  • 80mg to 160mg once a day (for children weighing 35kg to 80kg)
  • 80mg to 320mg once a day (for children weighing 80kg and more)

Will my dose go up or down?

After a few weeks your doctor will check your blood pressure and ask you if you're getting any side effects. You may also have blood tests to check how well your kidneys are working and the amount of potassium in your blood. Your doctor will then decide whether to change your dose of valsartan.

If valsartan doesn't get your blood pressure down, your doctor may want to increase the dose. If your blood pressure gets too low or you get side effects, your doctor may want to lower your valsartan dose.

How to take it

You can take valsartan tablets with or without food. Swallow the tablets with a drink of water.

If you're taking valsartan as a liquid, it will come with a plastic syringe or spoon to help you measure out the right dose. If you don't have one, ask your pharmacist for one. Do not use a kitchen teaspoon as it will not give the right amount of medicine.

Some people take valsartan in combination with other medicines:

  • with amlodipine (brand name Exforge) to treat high blood pressure
  • with hydrochlorothiazide (brand name Co-Diovan) to treat high blood pressure
  • with sacubitril (brand name Entresto) to treat a type of long-term heart failure


Take valsartan even if you feel well, as you will still be getting the benefits of the medicine.

What if I forget to take it?

If you miss a dose of valsartan, take it as soon as you remember, unless it's almost time for your next dose. Do not take a double dose to make up for a forgotten one.

If you forget doses often, it may help to set an alarm to remind you. You could also ask your pharmacist for advice on other ways to help you remember to take your medicine.

What if I take too much?

The amount of valsartan that can lead to an overdose varies from person to person.

Go to A&E as soon as possible if you've taken too much valsartan

Find your nearest hospital accident and emergency (A&E) department.

Do not drive yourself - get someone else to drive you or call for an ambulance.

Take the valsartan box, or the leaflet inside the packet, plus any remaining medicine with you.

5. Side effects

Like all medicines, valsartan can cause side effects although not everyone gets them. Side effects often improve as your body gets used to the medicine.

Common side effects

These common side effects happen in more than 1 in 100 people:

  • feeling dizzy or having a spinning sensation (vertigo)
  • headaches
  • feeling sick
  • vomiting or diarrhoea
  • pain in your joints or muscles

Talk to your doctor or pharmacist if these side effects bother you or don't go away.

Serious side effects

It happens rarely, but some people have serious side effects after taking valsartan. Tell a doctor straight away if you have:

  • yellow skin or eyes - this can be a sign of liver problems
  • pale skin, feeling tired, faint or dizzy, purple spots, any sign of bleeding, sore throat and fever - these can be signs of blood or bone marrow disorder
  • weakness, an irregular heartbeat, pins and needles and muscle cramps - these can be signs of changes in the sodium and potassium levels in your blood

Serious allergic reaction

In rare cases, valsartan may cause a serious allergic reaction (anaphylaxis).

Contact a doctor straight away if:

  • you get a skin rash that may include itchy, red, swollen, blistered or peeling skin
  • you're wheezing
  • you get tightness in the chest or throat
  • you have trouble breathing or talking
  • your mouth, face, lips, tongue or throat start swelling

These are warning signs of a serious allergic reaction. A serious allergic reaction is an emergency.

These are not all the side effects of valsartan. For a full list, see the leaflet inside your medicines packet.


You can report any suspected side effect to the UK safety scheme.

6. How to cope with side effects

What to do about:

  • feeling dizzy - if valsartan makes you feel dizzy when you stand up, try getting up very slowly or stay sitting down until you feel better. If you begin to feel dizzy, lie down so that you don't faint, then sit until you feel better. Don't drive or use tools or machines if you feel dizzy, have muscle cramps or muscle pain, or if you just feel a bit shaky.
  • headaches - make sure you rest and drink plenty of fluids. Don't drink too much alcohol. Ask your pharmacist to recommend a painkiller. Headaches should usually go away after the first week of taking valsartan. Talk to your doctor if they last longer than a week or are severe.
  • feeling sick - try taking your tablets with or after a meal or snack. It may also help if you don't eat rich or spicy food.
  • vomiting or diarrhoea - drink plenty of water to prevent dehydration. If you're vomiting try small, frequent sips. It may also help to take oral rehydration solutions to prevent dehydration. You can buy these from a pharmacy or supermarket. If you get severe vomiting or diarrhoea from a stomach bug or illness, tell your doctor. You may need to stop taking valsartan for a while until you feel better.
  • pain in your joints or muscles - if you get unusual muscle pain, weakness or tiredness which isn't from exercise or hard work, talk to your doctor. You may need a blood test to check what might be causing it.

7. Pregnancy and breastfeeding

Valsartan is not normally recommended in pregnancy or when breastfeeding. However, your doctor may prescribe it if they think the benefits of the medicine outweigh the risks.

If you're trying to get pregnant or you're already pregnant, talk to your doctor about the benefits and possible harms of taking valsartan. These will depend on how many weeks pregnant you are and the reason you need to take it. There may be other treatments that are safer for you.

Valsartan and breastfeeding

Small amounts of valsartan may get into breast milk. This can cause low blood pressure in the baby. Talk to your doctor, as other medicines might be better while you are breastfeeding.

Tell your doctor if you're:

  • trying to get pregnant
  • pregnant
  • breastfeeding

8. Cautions with other medicines

Some medicines interfere with the way valsartan works.

Tell your doctor if you're taking:

  • other medicines to help lower your blood pressure, including aliskiren, enalapril, captopril, lisinopril or ramipril
  • painkillers such as ibuprofen, naproxen, diclofenac, celecoxib or etoricoxib
  • aspirin (if you are taking more than 3g a day)
  • potassium supplements or salt substitutes which contain potassium
  • heparin (a medicine for thinning your blood)
  • water tablets (diuretics)
  • lithium (a medicine for mental health problems)
  • spironolactone (a medicine to treat heart failure)

Mixing valsartan with herbal remedies or supplements

There's very little information about taking herbal remedies and supplements with valsartan.


For safety, tell your doctor or pharmacist if you're taking any other medicines, including herbal remedies, vitamins or supplements.

9. Common questions

How does valsartan work?

Valsartan is a type of blood pressure-lowering medicine called an angiotensin receptor blocker.

Like other angiotensin receptor blockers, valsartan relaxes and widens your blood vessels. This lowers your blood pressure and makes it easier for your heart to pump blood around your body.

How long does valsartan take to work?

Valsartan starts to work after about 4 to 6 hours to reduce high blood pressure but it may take 2 to 4 weeks for full effect.

If you have high blood pressure, you may not have any symptoms. In this case, you may not feel any different when you take valsartan. This doesn't mean that the medicine isn't working and it's important to keep taking it.

How long will I take it for?

Usually, treatment with valsartan is long term, even for the rest of your life.

Is it safe to take for a long time?

Valsartan is generally safe to take for a long time. In fact, it works best when you take it for a long time.

Taking valsartan for a long time can sometimes cause your kidneys to not work as well as they should. Your doctor will check how well your kidneys are working with regular blood tests.

What will happen if I stop taking it?

Talk to your doctor if you want to stop taking valsartan.

Stopping valsartan may cause your blood pressure to rise - and this can increase your chances of having a heart attack or stroke.

If you're bothered by side effects, your doctor may be able to prescribe you a different blood pressure-lowering medicine.

Can I come off valsartan now my blood pressure is lower?

Even if your blood pressure is successfully lowered by valsartan, it's best to carry on taking it. If you stop taking valsartan, your blood pressure could rise back up again.

If you need blood pressure-lowering medicines, you'll probably need to take them for the rest of your life.

Remember, by keeping your blood pressure low, you're protecting yourself against having a heart attack or stroke in the future.

Can I drink alcohol with valsartan?

Drinking alcohol can increase the blood pressure-lowering effect of valsartan, which can make you feel dizzy or light-headed.

During the first few days of taking valsartan or after a dose increase, it is best to stop drinking alcohol until you see how the medicine affects you.

If you find valsartan makes you feel dizzy it's best to stop drinking alcohol.

Is there any food or drink I should avoid?

Don't use salt substitutes such as Lo-Salt. This is because they are high in potassium. When mixed with valsartan they may make the level of potassium in your blood too high.

There is nothing else you need to avoid while taking valsartan. Eating a healthy, balanced diet can help if you have high blood pressure.

Are there similar medicines to valsartan?

There are several other angiotensin receptor blockers which work in the same way as valsartan. They include candesartan, irbesartan and losartan.

There are also lots of other types of blood pressure-lowering medicines:

The blood pressure-lowering medicine you're prescribed depends on your age and ethnicity:

  • if you're under 55 - you'll usually be offered an ACE inhibitor or an angiotensin receptor blocker
  • if you're aged 55 or older, or you're any age and of African or Caribbean origin - you'll usually be offered a calcium channel blocker

Many people need to take a combination of different blood pressure-lowering medicines.

What are the differences between valsartan and other medicines for high blood pressure?

Valsartan works as well as other angiotensin receptor blockers when it's used to lower blood pressure. The side effects are also similar.

Valsartan is different from some other angiotensin receptor blockers because it is also officially approved for patients who have had a recent heart attack.

For the treatment of heart failure, valsartan is usually taken twice a day. Other angiotensin receptor blockers used to treat heart failure are usually taken once a day.

Valsartan also works as well as ramipril and other angiotensin converting enzyme (ACE) inhibitors to lower blood pressure, treat heart failure and prevent heart attacks.

It can be used by people who have tried taking ramipril or other ACE inhibitors but had to stop taking them because of side effects such as a dry, irritating cough.

Can I take valsartan before surgery?

If you're going to be put to sleep for an operation, tell your doctor that you're taking valsartan.

Valsartan can reduce your blood pressure when it's used with general anaesthetics (that put you to sleep).

Your doctor will probably advise you to stop taking valsartan 24 hours before surgery.

Can I take valsartan for migraines?

There's some evidence that valsartan might help prevent migraines.

However, valsartan is not officially approved for migraine. Your doctor would probably advise you to try other medicines first.

Can I take valsartan to protect myself against Alzheimer's disease?

There have been some studies which have looked at whether blood pressure medicines could help protect people against Alzheimer's disease. However, at the moment, there is not enough evidence to recommend taking valsartan or other similar medicines for Alzheimer's.

There are steps you can take that may reduce your risk of Alzheimer's. If you are worried about getting Alzheimer's disease in the future or have a family history of this condition, speak to your doctor.

Is there a problem with getting valsartan?

Some brands of valsartan were discontinued in 2016 and 2017. For a short time, there was a problem getting valsartan. Some people switched to other angiotensin receptor blockers to make sure there was no break in their blood pressure-lowering treatment.

There are still some companies that make valsartan. Your doctor can prescribe it and your pharmacy should be able to order it for you.

Is valsartan addictive?

No, there's no evidence that valsartan is addictive.

Will it affect my sex life?

Valsartan won't affect your sex life.

Will it affect my fertility?

There's no evidence that valsartan reduces fertility in men or women.

However, if you're a woman and you are trying to get pregnant, talk to your doctor first as this medicine is usually not recommended in pregnancy.

Will it affect my contraception?

For women, valsartan won't affect the contraceptive pill or the morning after pill.

However, some types of hormonal methods of contraception, like the combined contraceptive pill and contraceptive patch, aren't usually recommended for women taking valsartan and other medicines for high blood pressure. This is because hormonal contraceptives can raise your blood pressure and stop the medicine working properly.

Talk to your doctor if you're taking hormonal contraceptives.

Can I drive or ride a bike?

Valsartan can make some people feel dizzy - especially when you first start taking it or after taking a bigger dose. If this happens to you, don't drive a car, ride a bike, or use tools or machinery.

Can lifestyle changes help?

You can boost the health of your heart by making some key lifestyle changes. These will also help if you have high blood pressure or heart failure.

  • Stop smoking - smoking increases your heart rate and blood pressure. Quitting smoking brings down your blood pressure and relieves heart failure symptoms. Try and avoid secondhand smoke too.
  • Cut down on alcohol - drinking too much alcohol raises blood pressure over time. It makes heart failure worse too. Men and women shouldn't drink more than 14 units of alcohol a week.
  • Be more active - regular exercise lowers blood pressure by keeping your heart and blood vessels in good condition. It doesn’t need to be too energetic - walking every day is enough.
  • Eat healthily - aim to eat a diet that includes plenty of fruit and veg, wholegrains, fat-free or low-fat dairy products and lean proteins. It's a good idea to cut down on salt too. Eating too much salt is the biggest cause of high blood pressure - the more salt you eat, the higher your blood pressure will be. Aim for no more than 6g of salt a day.
  • Manage stress - when you're anxious or upset, your heart beats faster, you breathe more heavily and your blood pressure often goes up. This can make heart failure worse too. Find ways to reduce stress in your life. To give your heart a rest, try napping or putting your feet up when possible. Spend time with friends and family to be social and help keep stress at bay.
  • Vaccinations - if you have heart failure, you should have a flu jab every year and a pneumonia vaccination every 5 years. Ask your doctor about these vaccinations.

Page last reviewed: 14/08/2017
Next review due: 14/08/2020