Enzyme replacement for Pompe disease
Alglucosidase
A regular drip that replaces the missing enzyme in Pompe disease, an inherited lysosomal storage disorder affecting the muscles.
What is Alglucosidase?
Alglucosidase is an enzyme replacement therapy for Pompe disease, an inherited condition in which a sugar called glycogen builds up because an enzyme is missing, weakening the muscles, including the heart and the muscles used for breathing. It is given as a slow drip into a vein, usually every couple of weeks and for life, at a specialist metabolic centre. It does not cure Pompe disease but helps control it, and in babies it works best when started as early as possible. The most common issue is an infusion reaction, managed with pre-medication and by slowing the drip.
Education and reference only. This is a plain-language guide to Alglucosidase — 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
Alglucosidase is a man-made version of acid alpha-glucosidase, the enzyme that people with Pompe disease lack. Pompe disease is a rare inherited 'lysosomal storage' disorder, in which a sugar called glycogen that should be broken down builds up inside cells, particularly in muscle. This weakens the muscles, including the heart muscle and the muscles used for breathing, and can affect babies, children or adults. Alglucosidase (brand names Myozyme and Lumizyme) is given as a drip into a vein and is started and supervised by a specialist metabolic team.
How it works
Alglucosidase supplies the working enzyme that people with Pompe disease are missing, so the glycogen building up inside muscle cells can be broken down. Given regularly into a vein, it helps reduce these deposits in muscle, including the heart and the muscles used for breathing, which can improve or stabilise muscle strength and heart and lung function over time. Because the body keeps producing glycogen, the enzyme has to be replaced repeatedly, so treatment is lifelong. In babies, starting as early as possible gives the best results.
Company & origin
Originated / developed by: Specialist (Sanofi).
A laboratory-made copy of a missing enzyme, given by drip in UK specialist metabolic centres to treat the inherited condition Pompe disease.
Practical use
How to take Alglucosidase
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- It is given as a slow drip into a vein at a specialist centre, usually every couple of weeks, by trained staff.
- Pre-medication, such as an antihistamine or paracetamol, may be given to reduce the chance of an infusion reaction.
- Tell the staff at once if you or your child develops flushing, fever, a rash, sickness or breathing trouble during the drip.
- Keep to the infusion schedule, as starting early and continuing regularly gives the best results, especially in babies.
- Attend the extra checks of breathing, heart and muscle strength that go alongside the infusions.
Weighing it up
Advantages & disadvantages of Alglucosidase
Advantages
- Replaces the missing enzyme and can improve or stabilise muscle strength and heart and lung function.
- In babies, early treatment can be life-changing by protecting the heart and breathing muscles.
- Allows many people with Pompe disease to maintain better function than they would without it.
Disadvantages
- Does not cure Pompe disease and must be given by drip for life.
- Commonly causes infusion reactions needing pre-medication and monitoring.
- Some people, especially certain babies, make antibodies that can reduce how well it works.
Practical use
Good to know
Alglucosidase controls Pompe disease but does not cure it, so the drips continue for life and are arranged through a specialist metabolic centre. In babies with the severe early form, starting treatment as soon as possible gives the best chance of protecting the heart and breathing muscles, so prompt diagnosis matters. The most common issue is an infusion reaction, with flushing, fever, chills, a rash or feeling sick during or soon after the drip; pre-medication and a slower rate often help. Some people, especially certain babies, make antibodies to the enzyme that can reduce its effect, which the team monitors and sometimes treats. Breathing and muscle strength are followed closely, and physiotherapy and other support are often part of care.
Who should not take it / use with caution
- People who have had a severe allergic reaction to alglucosidase should not receive it again unless specialists advise.
- It is used with extra care in those who develop antibodies that reduce its effect or worsen reactions.
- Other illnesses, pregnancy or breastfeeding should be discussed with the metabolic team before continuing.
Monitoring
- Regular checks of muscle strength, breathing and the heart to see how the disease is responding.
- Watching for infusion reactions during and after each drip and for antibodies, especially in babies.
- Ongoing specialist review to adjust treatment and coordinate physiotherapy and breathing support.
Side effects
- Infusion reactions such as flushing, fever, chills, rash, nausea or a fast heartbeat are the most common.
- Less commonly, vomiting, cough or breathing changes during or after the drip, watched closely in babies.
- Rarely, a serious allergic reaction, which is why infusions are given where staff can respond quickly.
Key interactions
- No major routine medicine interactions are well established, but tell the team everything you or your child takes.
- Treatments for the heart and breathing are coordinated by the specialist centre alongside the infusions.
- Any new medicines should be mentioned so they can be reviewed with the enzyme treatment.
Available as: A drip (infusion) into a vein, given at a specialist centre.
Answers
Alglucosidase: frequently asked questions
Will alglucosidase cure Pompe disease?
No. It replaces the missing enzyme and helps control the disease, but it does not cure it, so the drips are needed for life.
Why is starting early so important in babies?
In the severe infant form, starting as soon as possible gives the best chance of protecting the heart and breathing muscles, so prompt diagnosis and treatment matter.
Why might my child feel unwell during the drip?
Infusion reactions such as flushing, fever or a rash are common; pre-medication and slowing the rate usually help settle them.
What are antibodies and why do they matter?
Some people, especially certain babies, make antibodies to the enzyme that can reduce its effect; the team monitors for this and sometimes treats it.
How often is the drip needed?
It is usually given every couple of weeks at a specialist centre, though your team will confirm the right schedule.
Authoritative sources
- BNF
- NICE CKS
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