A stimulant prodrug for ADHD (in a combination capsule)
Serdexmethylphenidate
A stimulant medicine used to treat ADHD, given as a prodrug combined with dexmethylphenidate.
What is Serdexmethylphenidate?
Serdexmethylphenidate is a stimulant medicine used to treat attention deficit hyperactivity disorder (ADHD). It is a prodrug, meaning the body converts it into dexmethylphenidate, and it comes in a combination capsule with some dexmethylphenidate already active, giving an effect through the day. As a stimulant, it is a controlled drug with a risk of dependence and misuse. Before starting, the heart and blood pressure are checked, and in children growth is monitored. It can also affect mood and sleep, and is used under specialist supervision.
Education and reference only. This is a plain-language guide to Serdexmethylphenidate — 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
Serdexmethylphenidate is a stimulant used to treat ADHD, a condition affecting attention, activity and impulse control. It is a prodrug of dexmethylphenidate, which means it is inactive until the body slowly converts it into the active medicine; it is combined in a single capsule with a smaller amount of ready-active dexmethylphenidate, so there is an effect early and then a sustained one through the day. Because it is a stimulant, it is a controlled drug, and it is prescribed and supervised carefully, with heart checks before treatment and growth monitoring in children.
How it works
The active part, dexmethylphenidate, increases the levels of brain chemicals (dopamine and noradrenaline) involved in attention and self-control, which helps improve focus and reduce impulsive, overactive behaviour in ADHD. The serdexmethylphenidate part is converted gradually in the body into more of this active medicine, which spreads the effect across the day from a single morning capsule. Because it stimulates these systems, it can raise heart rate and blood pressure and affect sleep and appetite, which is why the heart and growth are monitored. It works on the day it is taken rather than building up over weeks.
Company & origin
Originated / developed by: Specialist manufacturer.
A stimulant medicine for attention deficit hyperactivity disorder (ADHD), given as a prodrug combined with dexmethylphenidate in one capsule.
Practical use
How to take Serdexmethylphenidate
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- Take it once in the morning as prescribed, as a single capsule that lasts through the day.
- Take it earlier rather than later in the day, as taking it late can disturb sleep.
- Keep it stored securely and only as prescribed, as it is a controlled drug with a risk of misuse.
- Attend appointments to check the heart, blood pressure and, in children, growth.
- Report any chest pain, palpitations, fainting, or new anxiety or mood changes to your prescriber.
Weighing it up
Advantages & disadvantages of Serdexmethylphenidate
Advantages
- Improves attention and reduces impulsive, overactive behaviour in ADHD.
- A single morning capsule gives an effect through the day, from an early-acting and a prodrug part.
- Part of a structured ADHD treatment plan under specialist care.
Disadvantages
- A controlled drug with a risk of dependence and misuse.
- Can raise heart rate and blood pressure, and can affect mood and sleep.
- In children, can reduce appetite and slow growth, so growth is monitored.
Practical use
Good to know
Several safety points shape how serdexmethylphenidate is used. As a stimulant it is a controlled drug with a recognised risk of dependence and misuse, so it is prescribed carefully and kept securely. Before starting, the heart and blood pressure are checked, because stimulants can raise both and are used with caution in people with heart conditions. In children, growth (height and weight) is monitored, as stimulants can slow growth and reduce appetite. Stimulants can also affect mood, causing or worsening anxiety, irritability or, rarely, new psychiatric symptoms, so any such changes should be reported. Because it lasts through the day, taking it too late can disturb sleep. It is used as part of a wider ADHD treatment plan under specialist supervision.
Who should not take it / use with caution
- People with certain serious heart problems or uncontrolled high blood pressure should not take it.
- It should not be taken with, or close to, medicines called MAOI antidepressants.
- It is used with caution in people with a history of certain mental-health problems, and only under specialist supervision.
Monitoring
- Checking the heart and blood pressure before and during treatment.
- Monitoring growth (height and weight) in children.
- Watching for mood changes, sleep problems and any signs of misuse.
Side effects
- Reduced appetite, difficulty sleeping, headache or a dry mouth.
- A faster heartbeat or a rise in blood pressure.
- Anxiety, irritability or mood changes, and in children, slowing of growth.
Key interactions
- It must not be combined with MAOI antidepressants.
- Medicines that raise blood pressure or affect the heart can add to its effects and are reviewed.
- Give a full list of your medicines, as several can interact with stimulants.
Available as: Capsules taken by mouth once in the morning.
Answers
Serdexmethylphenidate: frequently asked questions
What is serdexmethylphenidate used for?
It is a stimulant used to treat ADHD, helping improve attention and reduce impulsive, overactive behaviour as part of a wider treatment plan.
What does 'prodrug' mean here?
It means serdexmethylphenidate is inactive until the body converts it into the active medicine, dexmethylphenidate; the capsule also contains some ready-active medicine for an early effect.
Is it addictive?
As a stimulant it is a controlled drug with a recognised risk of dependence and misuse, so it is prescribed carefully, stored securely and used only as directed.
Will it affect my child's growth?
Stimulants can reduce appetite and slow growth in children, so height and weight are monitored during treatment.
Why is my heart checked before starting?
Stimulants can raise heart rate and blood pressure, so the heart and blood pressure are checked beforehand and monitored during treatment.
The wider class
About Stimulant (prodrug of dexmethylphenidate)
Serdexmethylphenidate belongs to the stimulant (prodrug of dexmethylphenidate) 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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