An oral liquid medicine for Rett syndrome
Trofinetide
A specialist oral liquid medicine used to treat Rett syndrome, a rare genetic condition affecting development.
What is Trofinetide?
Trofinetide is a specialist medicine used to treat Rett syndrome, a rare genetic condition that affects brain development and is seen mainly in girls. It is given as an oral liquid by a specialist team. The most common and important side effects are diarrhoea, which is very common and can lead to dehydration and weight loss, and vomiting. Because of this, fluids and weight are watched closely, and any medicines that can also loosen the bowels may need reviewing. It is a specialist treatment that needs careful monitoring.
Education and reference only. This is a plain-language guide to Trofinetide — 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
Trofinetide is a medicine used to treat Rett syndrome, a rare genetic condition that affects how the brain develops and works. It is seen almost entirely in girls and causes problems with movement, communication and other skills. Trofinetide is given as a liquid taken by mouth (or through a feeding tube where one is used) and is prescribed and supervised by a specialist team experienced in this condition. It is one of the first medicines developed specifically for Rett syndrome and is used as part of broader care for the condition.
How it works
Rett syndrome affects the way nerve cells in the brain connect and function. Trofinetide is thought to support the health and function of brain cells and the connections between them, which may help with some of the difficulties caused by the condition. It does not cure Rett syndrome, but it is intended to improve aspects of how the condition affects the person. Because it works gradually as part of ongoing treatment, it is given regularly as a liquid and monitored over time by the specialist team to judge its benefit and watch for side effects.
Company & origin
Originated / developed by: Specialist manufacturer.
A specialist medicine developed to treat Rett syndrome, a rare genetic condition affecting development, mainly in girls.
Practical use
How to take Trofinetide
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- Give it as an oral liquid (or through a feeding tube if one is used), exactly as the specialist team directs.
- Watch closely for diarrhoea, and keep up fluids to help prevent dehydration.
- Keep an eye on weight, as diarrhoea and vomiting can lead to weight loss.
- Tell the team about any laxatives or other medicines that could make diarrhoea worse, so they can be reviewed.
- Contact the team if diarrhoea or vomiting is severe, persistent or causing signs of dehydration.
Weighing it up
Advantages & disadvantages of Trofinetide
Advantages
- One of the first medicines developed specifically to treat Rett syndrome.
- Given as a liquid, which can be taken by mouth or through a feeding tube.
- Used as part of specialist care that includes regular monitoring.
Disadvantages
- Very commonly causes diarrhoea, which can lead to dehydration and weight loss.
- Commonly causes vomiting.
- Needs careful monitoring of fluids and weight and specialist supervision.
Practical use
Good to know
The two most important things to expect with trofinetide are diarrhoea and vomiting. Diarrhoea is very common and can be significant: it can lead to dehydration and weight loss, so it is important to keep up fluids, watch weight, and tell the team if diarrhoea is troublesome. The team may advise on how to manage it and may review any other medicines or supplements, such as laxatives, that could make the bowels looser. Because the medicine is a liquid given by mouth or feeding tube, getting the routine right with carers is part of treatment. It is a specialist medicine, so regular reviews are used to weigh up how much it is helping against side effects, and to keep an eye on hydration and weight, particularly in someone who may not be able to say how they feel.
Who should not take it / use with caution
- People who have had a serious allergic reaction to trofinetide should not take it.
- It is used with care in anyone already prone to dehydration or significant weight loss, with close monitoring.
- It should only be used under a specialist team experienced in Rett syndrome.
Monitoring
- Watching closely for diarrhoea, vomiting and signs of dehydration.
- Keeping track of weight and appetite over time.
- Reviewing how much the medicine is helping against its side effects at specialist appointments.
Side effects
- Diarrhoea, which is very common and can lead to dehydration and weight loss.
- Vomiting, which is common.
- Reduced appetite or weight loss linked to the bowel effects.
Key interactions
- Laxatives and other medicines that loosen the bowels can add to the diarrhoea, so they may need reviewing.
- Other medicines or supplements should be discussed with the team, especially those affecting the gut.
- Tell the team about everything the person takes, as managing diarrhoea is a key part of treatment.
Available as: An oral liquid, which can also be given through a feeding tube.
Answers
Trofinetide: frequently asked questions
What is trofinetide used for?
It is a specialist medicine used to treat Rett syndrome, a rare genetic condition affecting brain development, seen mainly in girls.
Does it cause diarrhoea?
Yes. Diarrhoea is very common and can be significant, sometimes leading to dehydration and weight loss, so fluids and weight are watched closely.
How is it given?
It is given as an oral liquid taken by mouth, or through a feeding tube if one is used, exactly as the specialist team directs.
Does it cure Rett syndrome?
No. It does not cure the condition, but it is intended to improve some of the difficulties Rett syndrome causes, as part of broader specialist care.
What should I do if diarrhoea is bad?
Keep up fluids and contact the specialist team, as severe or persistent diarrhoea can cause dehydration and weight loss and may need managing.
Authoritative sources
- BNF
- NICE CKS
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