(Date: September 2018. Version: 3)

This factsheet has been written for members of the public by the UK Teratology Information Service (UKTIS). UKTIS is a not-for-profit organisation funded by the UK Health Security Agency (UKHSA) on behalf of UK Health Departments. UKTIS has been providing scientific information to health care providers since 1983 on the effects that medicines, recreational drugs and chemicals may have on the developing baby during pregnancy.

What is it?

Malarone® contains a combination of two different anti-malarial medicines called atovaquone and proguanil. It is used to:
• prevent malaria infection (for example, before travelling to a part of the world where the chance of being infected with malaria is high) 
• treat a person who has been infected with malaria 

Malaria is a serious illness that is spread by mosquito bites and can result in death. Malaria infection in pregnancy can be dangerous to the health of both mother and baby. Pregnant women are therefore advised to avoid travelling to areas where there is a risk of catching malaria. If you are pregnant or planning a pregnancy and cannot avoid travelling to a high risk malaria area, ask your doctor for advice as soon as possible. You may need to start taking an antimalarial medicine a few weeks before you travel. Your doctor is the best person to help you decide what is right for you and your baby.

Is it safe to use malarone in pregnancy?

If you are travelling to certain regions you may be specifically advised to take Malarone. This is because in some areas, other anti-malarial medicines are ineffective because the malaria parasite has developed resistance to them. You should not avoid taking malarone just because you are pregnant. The risk of harm to you and your baby from malaria is likely to be far greater than any potential risk from taking malarone.

No antimalarial medicine is 100% effective and it is very important that you also reduce the chance of being bitten by using insect repellents, mosquito nets, and covering as much skin as possible with clothing, particularly between dawn and dusk. Please read our bump leaflets on insect repellents  and malaria for more information. 

What if I have already taken malarone during pregnancy?

It is always a good idea to let your doctor know that you are pregnant if you have taken any medicines in case you need any additional monitoring or treatment.

This leaflet summarises the scientific studies relating to the effects of malarone on a baby in the womb. 

Can use of malarone in pregnancy cause my baby to be born with birth defects?

A baby’s body and most internal organs are formed during the first 12 weeks of pregnancy. It is mainly during this time that some medicines are known to cause birth defects.

Studies of approximately 315 women who used malarone in the first trimester of pregnancy do not suggest that their babies had a higher chance of birth defects than babies not exposed in the womb to malarone. Larger, well-designed studies are ideally required to confirm this finding.

Can use of malarone in pregnancy cause miscarriage?

A small study of 165 women taking malarone suggested that they did not have a higher chance of miscarriage than women in the background population. This finding needs to be confirmed with further research.

Can use of malarone in pregnancy cause stillbirth?

No studies have investigated the chance of stillbirth in women taking malarone in pregnancy.

Can use of malarone in pregnancy cause preterm birth or my baby to be small at birth (low birth weight)?

One very small study showed that women with malaria treated with malarone were no more likely to have a preterm birth or a baby with a low birth weight than women with malaria treated with a different medicine. Larger numbers of women need to be studied to confirm these findings.

Can taking malarone in pregnancy cause learning or behavioural problems in the child?

A baby’s brain continues to develop right up until the end of pregnancy. It is therefore possible that taking certain medicines at any stage of pregnancy could have a lasting effect on a child’s learning or behaviour.

A small study of 17 toddlers exposed in the womb to malarone showed that their development at one year old did not differ from that of toddlers exposed in the womb to other medicines to treat malaria. Further larger studies that  continue to assess many different aspects of learning and behavior in children as they get older are required to confirm that exposure in the womb to malarone has no effects.

Will my baby need extra monitoring during pregnancy?

As part of their routine antenatal care most women will be offered a scan at around 20 weeks of pregnancy to look for birth defects and to check the baby’s growth.

Taking malarone during pregnancy is not expected to cause any problems that would require extra monitoring of your baby. However, if you have been infected with malaria during your pregnancy your doctor may wish to monitor your pregnancy more closely. 

Are there any risks to my baby if the father has used malarone?

We would not expect any increased risk to your baby if the father used malarone before or around the time you became pregnant.

Who can I talk to if I have questions?

If you have any questions regarding the information in this leaflet please discuss them with your health care provider. They can access more detailed medical and scientific information from  

Feedback request 

WE NEED YOUR HELP! Do you have 3 minutes to complete a short, quick and simple 12 question user feedback form about our bumps information leaflets? To have your say on how we can improve our website and the information we provide please visit here.

General information 

Up to 1 out of every 5 pregnancies ends in a miscarriage, and 1 in 40 babies are born with a birth defect. These are referred to as the background population risks.  They describe the chance of these events happening for any pregnancy before taking factors such as the mother’s health during pregnancy, her lifestyle, medicines she takes and the genetic make up of her and the baby’s father into account.

Medicines use in pregnancy

Most medicines used by the mother will cross the placenta and reach the baby. Sometimes this may have beneficial effects for the baby.  There are, however, some medicines that can harm a baby’s normal development.  How a medicine affects a baby may depend on the stage of pregnancy when the medicine is taken. If you are on regular medication you should discuss these effects with your doctor/health care team before becoming pregnant.

If a new medicine is suggested for you during pregnancy, please ensure the doctor or health care professional treating you is aware of your pregnancy.

When deciding whether or not to use a medicine in pregnancy you need to weigh up how the medicine might improve your and/or your unborn baby’s health against any possible problems that the drug may cause. Our bumps leaflets are written to provide you with a summary of what is known about use of a specific medicine in pregnancy so that you can decide together with your health care provider what is best for you and your baby.   

Every pregnancy is unique. The decision to start, stop, continue or change a prescribed medicine before or during pregnancy should be made in consultation with your health care provider. It is very helpful if you can record all your medication taken in pregnancy in your hand held maternity records.

Disclaimer: This information is not intended to replace the individual care and advice of your health care provider. New information is continually becoming available. Whilst every effort will be made to ensure that this information is accurate and up to date at the time of publication, we cannot cover every eventuality and the information providers cannot be held responsible for any adverse outcomes following decisions made on the basis of this information. We strongly advise that printouts should NOT be kept for any length of time, or for “future reference” as they can rapidly become out of date.

My bump’s record

Create your own ‘My bump’s record’.

Provide information about your pregnancy to help women in the future.

Login to my bumps

Join my bumps